Apparatus for the assembly and disassembly of hydraulic cylinders

Abstract

The invention relates to an apparatus for the assembly and disassembly of hydraulic cylinders, composed of a pedestal-like machine frame having horizontally arranged guide means which bear, in displaceable manner, a receptacle for the cylinder barrel of the hydraulic cylinder, at least one receptacle for a support and a receptacle for a tool, and furthermore having a holder for fixing the piston rod of the hydraulic cylinder. According to the invention, the holder for fixing the piston rod has a centering carriage which is driven by a centering spindle and which comprises a piston rod receptacle, wherein the holder is designed to be rotatable about the longitudinal axis of the machine frame and the rotational movement is realized by means of a torque-controlled electromotive drive.

Claims

1. An apparatus for the assembly and disassembly of hydraulic cylinders, composed of a pedestal-like machine frame (1) which has horizontally arranged guide means (2) which bear, in displaceable manner, a receptacle (3) for the cylinder barrel (4) of the hydraulic cylinder, at least one receptacle (5; 6) for a support (50; 60) and a receptacle (8) for a tool (9), and furthermore having a holder (10) for fixing the piston rod (7) of the hydraulic cylinder, characterized in that the holder (10) for fixing the piston rod (7) has a centering carriage (12) which is driven by a centering spindle (11) and which comprises a piston rod receptacle (13), wherein the holder is designed to be rotatable about the longitudinal axis of the machine frame (1) and the rotational movement is realized by means of a torque-controlled electromotive drive (14).

2. The apparatus according to claim 1, characterized in that the displaceable receptacle (3) for the cylinder barrel (4) has a centering carriage (16) driven by an additional centering spindle (15), with the displaceability being realized in the direction of the longitudinal axis of the machine frame.

3. The apparatus according to claim 1, characterized in that the tool receptacle comprises a sliding carriage (8) with supporting arms (17) having a slot-shaped recess (18) for holding the tool (9) in exchangeable manner.

4. The apparatus according to claim 3, characterized in that the tool (9) has a shaped part or opening, formed as a wrench surface (19), or for receiving a tool adapter.

5. The apparatus according to claim 1, characterized in that the holder (16) for fixing the hydraulic cylinder (4) can be connected to the machine frame (1) in force-dissipating manner.

6. The apparatus according to claim 1, characterized in that the electromotive drive (14) comprises a geared motor.

7. The apparatus according to claim 1, characterized in that the electromotive drive (14) comprises a torque sensor system with respect to the forces or moments occurring between tool (9) and hydraulic cylinder.

8. The apparatus according to claim 1, characterized in that the receptacle (3) for the cylinder barrel (4) and the receptacle (8) for the tool (9) are displaceable by means of an electromotive motion drive (20).

9. The apparatus according to claim 8, characterized in that for said displaceability, there are formed roller or sliding guide grooves in or at the machine frame (1).

10. The apparatus according to claim 1, characterized in that the at least one support (50; 60) is adjustable in height.

11. The apparatus according to claim 1, characterized in that the machine frame (1) is of self-supporting and non-anchoring design.

Description

(1) The invention shall be explained in more detail hereinafter by way of an embodiment and with the assistance of the drawings in which:

(2) FIG. 1 shows a perspective view of the apparatus according to the invention for assembly and disassembly of hydraulic cylinders;

(3) FIG. 2 shows a longitudinal side view, a plan view and a face side view of the apparatus according to the invention, illustrating in broken lines the piston rod along with the piston and the cylinder of an already disassembled hydraulic cylinder; and

(4) FIG. 3 shows a perspective detailed view looking at the holder for receiving the piston rod, along with the centering spindle, centering carriage and piston rod receptacle.

(5) The apparatus according to the invention, as illustrated in FIGS. 1 to 3, is based firstly on a pedestal-like machine frame 1 that is of self-supporting and non-anchoring design. At or in the machine frame 1, there are provided horizontally arranged or horizontally extending guide means 2.

(6) These guide means bear a slidingly movable or displaceable receptacle 3 for the cylinder barrel for (cf. FIG. 2) of the respective hydraulic cylinder to be overhauled, a receptacle 5 as support for the cylinder barrel as well as a receptacle 6 as support for the piston rod of the hydraulic cylinder to be overhauled.

(7) The piston rod is assigned numeral 7 in FIG. 2.

(8) Moreover, there is provided a receptacle 8 for a tool 9, and a holder 10 is formed for fixing the piston rod 7 of the hydraulic cylinder.

(9) The holder 10 for the piston rod 7 shall be explained in more detail by way of FIG. 3.

(10) The holder comprises a centering carriage 12 which is driven by a centering spindle 11 and has a piston rod receptacle 13.

(11) By way of an optional bearing, it is possible to rotate the holder 10 about the longitudinal axis of the machine frame 1, entraining the piston rod 7 mounted in the piston rod receptacle 13 (cf. FIG. 2).

(12) The rotational movement is realized by way of a torque-controlled electromotive drive 14.

(13) The displaceable receptacle 3 for the cylinder barrel 4 also comprises a centering carriage 16 that is driven by an additional centering spindle 15, with the displaceability being provided in the direction of the longitudinal axis of the machine frame 1.

(14) The tool receptacle 8 is constituted by a sliding carriage with supporting arms 17 that form a slot-shaped recess 18 for holding the tool 9 in exchangeable manner. The slot-shaped recess 18, however, can also accommodate an adapter for receiving already existing tools, such as e.g. special nuts, in order to thus avoid the manufacture of expensive special tools.

(15) As can be seen in FIG. 1, the tool 9 has a shaped part in the form of a wrench surface 19. The holder 16 for fixing the hydraulic cylinder 4 is fixedly located at the machine frame 1, and in particular is threadedly engaged with the same, but is rotatable about its own axis upon release of a locking means.

(16) The receptacle 3 for the cylinder barrel 4 and the receptacle 8 for the tool 9, and optionally also the supports 5 and 6, can be displaced relatively to each other in longitudinal direction and positioned by way of an electromotive motion drive 20.

(17) For providing the displaceability, there are formed corresponding roller or sliding guides 2 in or at the machine frame 1.

(18) The supports 5 and 6, having receiving surfaces 50 and 60, respectively, are designed such that the receiving surfaces or receiving elements are adjustable in height.

(19) The machine frame 1 is designed as a massive, self-supporting steel beam or steel frame construction and is suitable to safely take up all forces occurring during operation of the apparatus, without distortion or changes in position of the essential components of the apparatus taking place.

(20) With the aid of the centering carriages, it is possible to effect very accurate positioning and positional association of cylinder barrel and piston rod, so that exact, damage-free assembly and disassembly of the respective hydraulic cylinders to be overhauled is rendered possible. The opening formed by the spaced-apart recess for receiving the tool proper, created by the supporting arms, can be used, while the tool 9 is at first removed, for separating the piston along with the piston rod from the cylinder barrel with the aid of the motion drive. Thereafter, the tool 9 is inserted and the tool carriage along with the tool is moved to a position permitting the piston rod nut to be moved towards the wrench surface of the tool in order to then remove the piston nut by activation of the torque-controlled drive. Upon e.g. overhauling of the piston, assembly takes place in reverse manner, wherein due to the free accessibility with regard to removal of the tool from the carriage, working without removal of cylinder barrel and/or piston rod from the apparatus is conceivable.