A hydraulic cylinder cleaning device

Abstract

This utility model provides a hydraulic cylinder cleaning device, relating to the field of hydraulic cylinder cleaning devices. The utility model includes a cleaning machine and a hollow round rod. When the hollow round rod is inserted into the inner wall of the hydraulic cylinder, it drives the threaded hollow rod and several brushes to also be inserted into the inner wall of the hydraulic cylinder. Then, depending on the size of the inner wall of the hydraulic cylinder, the electric telescopic rod is activated to retract, causing the slide to slide to one end within the inner wall of the threaded hollow rod. This pushes the connecting rod to one end, pushing the brushes outward and causing the limiting telescopic rod to extend until one side of the brush abuts against the inner wall of the hydraulic cylinder. Thus, when the motor drives the hollow round rod to rotate, it can drive the threaded hollow rod and several brushes to clean the inner wall of the hydraulic cylinder. Through this adjustment, the inner walls of hydraulic cylinders with different inner diameters can be cleaned, improving the compatibility of the brushes and the cleaning machine, and making it convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder cleaning devices, and in particular to a hydraulic cylinder cleaning device. Background Technology

[0002] A cleaning device is a piece of equipment used to clean the inside of hydraulic cylinders in a hydraulic system. Its function is to remove impurities through effective cleaning methods and maintain the normal operation of the hydraulic system.

[0003] When using a cleaning machine to clean the inside of a hydraulic cylinder, the cylinder is placed on a perforated limiting frame for fixation. Then, the internal drive mechanism of the cleaning machine is activated, causing the perforated limiting frame to slide into the machine. The machine cover is then closed, and the internal drive mechanism is activated again, causing the sliding frame to slide from one side to the other. The hollow rod, brush, and spray nozzle are then inserted into the hydraulic cylinder. This drive mechanism can be a motor driving a lead screw, or other drive components; no specific limitation is made. The motor is then activated again to drive the hollow rod... The brush rotates to clean the inside of the hydraulic cylinder. At the same time, the water pump inside the cleaning machine is activated to draw the cleaning fluid from the bottom into the spray pipe through the hose, spraying and cleaning the inner wall of the hydraulic cylinder. Since the brush size in existing cleaning machines is usually fixed, when dealing with hydraulic cylinders with small inner diameters, the brush size may be too large to be inserted smoothly. If it is necessary to clean cylinders with large inner diameters, the fixed-size brush cannot fully cover the inner wall, resulting in incomplete cleaning and the existence of cleaning dead corners. This leads to low compatibility between traditional brushes and cleaning machines, making them inconvenient to use. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic cylinder cleaning device, which aims to solve the problems in the prior art.

[0005] This utility model is implemented as follows: a hydraulic cylinder cleaning device includes a cleaning machine and a hollow round rod. A sliding frame is slidably installed on one side of the cleaning machine. The outer surface of the hollow round rod is installed through one side of the inner wall of the cleaning machine and one side of the sliding frame. A motor is fixedly installed on one side of the sliding frame, wherein the output end of the motor is fixedly installed on one side of the hollow round rod by means of a coupling. A hollow limiting frame is slidably installed on the inner wall of the cleaning machine. An adjustment device is provided on one side of the hollow round rod. The adjustment device can adjust the distance between several brushes and the hollow rod with screw holes, so that it can be adapted to hydraulic cylinders with different inner diameters, facilitating the cleaning of their inner walls.

[0006] The effect achieved by the above components is as follows: When cleaning the inside of the hydraulic cylinder using the cleaning machine, the hydraulic cylinder is placed on the hollow limiting frame for limiting and fixing. Then, the internal drive mechanism of the cleaning machine is activated to drive the hollow limiting frame to slide into the cleaning machine. At this time, the machine cover is closed, and the internal drive mechanism is activated again to drive the sliding frame to slide to one end on one side, inserting the hollow round rod, several brushes, and spray pipe into the inside of the hydraulic cylinder. The drive mechanism here can be driven by a motor and a lead screw, or other drive components, so no fixed limitation is made. Depending on the inner diameter of the hydraulic cylinder to be cleaned, the adjustment device can be activated to adjust the brush outwards so that one side of it abuts against the inner wall of the hydraulic cylinder, facilitating cleaning of the inner wall. This adjustment allows for cleaning of the inner walls of hydraulic cylinders with different inner diameters, improving the compatibility between the brush and the cleaning machine and making it easier to use. Then, the motor is started to drive the hollow rod and brush to rotate and clean the inside of the hydraulic cylinder. At the same time, the water pump inside the cleaning machine is activated to draw the cleaning fluid from the bottom through the hose into the spray pipe to spray and clean the inner wall of the hydraulic cylinder.

[0007] Preferably, the adjusting device includes a hollow rod with a screw hole, wherein a replacement mechanism is provided between one end of the hollow rod and one end of the hollow round rod, and the inner wall of the hollow rod with a plurality of sliding holes is formed; an electric telescopic rod, wherein one end of the electric telescopic rod is fixedly installed on one side of the inner wall of the hollow rod with a screw hole; a slide, wherein the outer surface of the slide is slidably installed in the sliding holes and the inner wall of the hollow rod with a screw hole, and one side is fixedly connected to the output end of the electric telescopic rod; a plurality of limiting telescopic rods, wherein one end of the limiting telescopic rod is fixedly installed on one side of the hollow rod with a screw hole; a plurality of brushes, wherein one side of the brush is fixedly installed on one side of the limiting telescopic rod; and a plurality of connecting rods, wherein the two ends of the connecting rods are respectively rotatably installed in the inner wall of one side of the brush and the inner wall of the slide.

[0008] The effect achieved by the above components is as follows: By setting an adjustment device, one end of the hollow rod with a screw hole is first fixedly installed on one end of the hollow round rod using a mechanism that facilitates replacement. Then, when the hollow round rod is inserted into the inner wall of the hydraulic cylinder, it will drive the hollow rod with a screw hole and several brushes to also be inserted into the inner wall of the hydraulic cylinder. Then, depending on the size of the inner wall of the hydraulic cylinder, the electric telescopic rod is activated to retract, causing the slide to slide to one end in the inner wall of the hollow rod with a screw hole. Then, the connecting rod is pushed to one end, pushing the brushes outward and causing the limiting telescopic rod to stretch until one side of the brush abuts against the inner wall of the hydraulic cylinder. In this way, when the motor drives the hollow round rod to rotate, it can drive the hollow rod with a screw hole and several brushes to clean the inner wall of the hydraulic cylinder. Through this adjustment, the inner walls of hydraulic cylinders with different inner diameters can be cleaned, improving the compatibility of the brushes and cleaning machine and making it convenient to use.

[0009] Preferably, a plurality of reinforcing rods are fixedly installed on the outer surface of the output end of the electric telescopic rod, wherein one side of the plurality of reinforcing rods is fixedly installed on one side of the slide.

[0010] The effect achieved by the above components is that by setting up reinforcing rods, the connection area between the electric telescopic rod and the carriage can be increased, making the connection more secure, stable, and less prone to breakage or damage.

[0011] Preferably, bearings are fixedly installed on the outer surfaces of both ends of the connecting rod, and the outer rings of the plurality of bearings are respectively fixedly installed in the inner wall of one end of the brush and the inner wall of the slide.

[0012] The effect achieved by the above components is that by setting bearings, the rotational wear between the connecting rod and the brush and carriage can be reduced, the connecting rod can be rotated more easily, and the service life of all three components can be increased.

[0013] Preferably, the easy-to-replace mechanism includes a bolt, and a slot is provided on one side of the hollow rod, wherein one end of the hollow rod with a screw hole is inserted into the inner wall of the slot, and threaded holes are symmetrically provided on the inner wall of the slot, wherein one end of the bolt is helically inserted into the inner wall of one end of the hollow rod with a screw hole and the inner wall of the threaded hole.

[0014] The effect achieved by the above components is as follows: by setting up an easy replacement mechanism, when it is necessary to install the replaced screw-hole hollow rod and brush on the hollow round rod, one end of the screw-hole hollow rod can be inserted into the slot, and then the bolt can be screwed into the threaded hole and the inner wall of the screw-hole hollow rod to fix it. In this way, the screw-hole hollow rod and brush can be fixedly installed on one end of the hollow round rod. Similarly, the reverse operation can be performed to disassemble them for easy replacement and maintenance.

[0015] Preferably, a connecting rope is fixedly installed on one side of the bolt, and one end of the connecting rope is fixedly installed on the outer surface of one end of the hollow rod with the bolt hole.

[0016] The effect achieved by the above components is that by setting a connecting rope, the bolt can be fixed to the outer surface of the hollow rod with the threaded hole, so that it is not easy to lose after being pulled out of the threaded hole.

[0017] Preferably, a limiting block is symmetrically fixedly installed on the outer surface of one end of the hollow rod with screw holes, and a limiting groove is symmetrically opened on the inner wall of the slot, with the limiting block inserted into the inner wall of the limiting groove.

[0018] The effect achieved by the above components is as follows: by setting the limiting block and the limiting groove, when installing the hollow rod with the screw hole, the limiting block can be aligned with the limiting groove, and then one end of the hollow rod with the screw hole can be inserted into the slot, so that the inner wall of one end of the hollow rod with the screw hole can be quickly aligned with the threaded hole, which facilitates the subsequent bolt installation and improves the installation efficiency.

[0019] The beneficial effects of this utility model are:

[0020] By setting up an adjustment device, one end of the hollow rod with a screw hole is first fixed to one end of the hollow round rod using an easy-to-replace mechanism. Then, when the hollow round rod is inserted into the inner wall of the hydraulic cylinder, it will drive the hollow rod with the screw hole and several brushes to also be inserted into the inner wall of the hydraulic cylinder. Then, depending on the size of the inner wall of the hydraulic cylinder, the electric telescopic rod is activated to retract, causing the slide to slide to one end in the inner wall of the hollow rod with the screw hole, and then pushing the connecting rod to one end, pushing the brushes outward, causing the limiting telescopic rod to stretch until one side of the brush abuts against the inner wall of the hydraulic cylinder. In this way, when the motor drives the hollow round rod to rotate, it can drive the hollow rod with the screw hole and several brushes to clean the inner wall of the hydraulic cylinder. Through this adjustment, the inner walls of hydraulic cylinders with different inner diameters can be cleaned, improving the compatibility of the brushes and cleaning machine and making it convenient to use. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a three-dimensional structural diagram of the hollow round rod of this utility model;

[0023] Figure 3 This is a three-dimensional structural diagram of the hollow rod with screw holes in this utility model;

[0024] Figure 4 for Figure 3 A three-dimensional schematic diagram of a local structure.

[0025] Legend: 1. Cleaning machine; 2. Adjustment device; 3. Sliding frame; 4. Hollow round rod; 5. Motor; 6. Hollow limit frame; 21. Hollow rod with screw hole; 22. Sliding hole; 23. Electric telescopic rod; 24. Sliding frame; 25. Limiting telescopic rod; 26. Brush; 27. Connecting rod; 28. Easy-to-replace mechanism; 281. Slot; 282. Threaded hole; 283. Bolt; 284. Connecting rope; 285. Limiting block; 286. Limiting groove; 29. ​​Reinforcing rod; 210. Bearing. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0028] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0029] In this embodiment:

[0030] Reference Figure 1 The diagram shows a preferred embodiment of the present invention.

[0031] This embodiment Figure 1-4The hydraulic cylinder cleaning device shown includes a cleaning machine 1 and a hollow round rod 4. A sliding frame 3 is slidably installed on one side of the cleaning machine 1. The outer surface of the hollow round rod 4 is installed through one side of the inner wall of the cleaning machine 1 and one side of the sliding frame 3. A motor 5 is fixedly installed on one side of the sliding frame 3. The output end of the motor 5 is fixedly installed on one side of the hollow round rod 4 by means of a coupling. A hollow limit frame 6 is slidably installed on the inner wall of the cleaning machine 1. An adjustment device 2 is provided on one side of the hollow round rod 4. The adjustment device 2 can adjust the distance between several brushes 26 and the screw hole hollow rod 21, so that it can be adapted to hydraulic cylinders with different inner diameters, which is convenient for cleaning their inner walls. When using cleaning machine 1 to clean the inside of the hydraulic cylinder, the hydraulic cylinder is placed on the hollow limiting frame 6 for limiting and fixing. Then, the internal drive mechanism of cleaning machine 1 is activated to drive the hollow limiting frame 6 to slide into the interior of cleaning machine 1. At this time, the machine cover is closed, and the internal drive mechanism is activated to drive the sliding frame 3 to slide from one side to one end, inserting the hollow round rod 4, several brushes 26, and spray pipe into the interior of the hydraulic cylinder. The drive mechanism here can be a motor 5 driving a lead screw, or other drive mechanisms, so there is no fixed limitation. Then, it can be adjusted as needed. To clean the hydraulic cylinder, adjust the brush 26 outwards so that one side of it rests against the inner wall of the cylinder, facilitating cleaning. This adjustment allows for cleaning of hydraulic cylinders with different inner diameters, improving the compatibility between the brush 26 and the cleaning machine. Then, start the motor 5 to rotate the hollow rod 4 and brush 26 to clean the inside of the hydraulic cylinder. Simultaneously, start the water pump inside the cleaning machine 1 to draw cleaning fluid from the bottom through a hose into the spray nozzle, spraying and cleaning the inner wall of the hydraulic cylinder. It should be noted that the cleaning machine 1 utilizes existing mature technology and equipment; its internal structure, connection methods, and operating principles will not be elaborated upon.

[0032] Figure 1-4The adjustment device 2 shown includes a hollow rod 21 with a screw hole, wherein a replacement mechanism 28 is provided between one end of the hollow rod 21 and one end of the hollow round rod 4, and the inner wall of the hollow rod 21 has several sliding holes 22; an electric telescopic rod 23, wherein one end of the electric telescopic rod 23 is fixedly installed on one side of the inner wall of the hollow rod 21; a slide 24, wherein the outer surface of the slide 24 is slidably installed in the sliding holes 22 and the inner wall of the hollow rod 21, and one side is fixedly connected to the output end of the electric telescopic rod 23; several limiting telescopic rods 25, wherein one end of the limiting telescopic rod 25 is fixedly installed on one side of the hollow rod 21; several brushes 26, wherein one side of the brushes 26 is fixedly installed on one side of one end of the limiting telescopic rods 25; and several connecting rods 27, wherein the two ends of the connecting rods 27 are respectively rotatably installed in the inner wall of one side of the brushes 26 and the inner wall of the slide 24. By setting the adjustment device 2, one end of the hollow rod 21 with screw holes is first fixedly installed on one end of the hollow round rod 4 with the help of the easy-to-replace mechanism 28. Then, when the hollow round rod 4 is inserted into the inner wall of the hydraulic cylinder, the hollow rod 21 with screw holes and several brushes 26 will also be inserted into the inner wall of the hydraulic cylinder. Then, according to the size of the inner wall of the hydraulic cylinder, the electric telescopic rod 23 is activated to retract, which drives the slide 24 to slide to one end in the inner wall of the hollow rod 21 with screw holes. Then, the connecting rod 27 is pushed to one end, pushing the brushes 26 outward, which drives the limiting telescopic rod 25 to stretch until one side of the brushes 26 abuts against the inner wall of the hydraulic cylinder. In this way, when the motor 5 drives the hollow round rod 4 to rotate, the hollow rod 21 with screw holes and several brushes 26 can be driven to clean the inner wall of the hydraulic cylinder. Through this adjustment, the inner wall of hydraulic cylinders with different inner diameters can be cleaned, improving the compatibility of the brushes 26 and the cleaning machine, and making it convenient to use.

[0033] Figure 1-4 Several reinforcing rods 29 are fixedly installed on the outer surface of the output end of the electric telescopic rod 23, with one side of each reinforcing rod 29 fixedly installed on one side of the slide 24. By setting the reinforcing rods 29, the connection area between the electric telescopic rod 23 and the slide 24 can be increased, making the connection more robust, stable, and less prone to breakage or damage. Bearings 210 are fixedly installed on the outer surfaces of both ends of the connecting rod 27, with the outer rings of several bearings 210 respectively fixedly installed on the inner wall of one end of the brush 26 and the inner wall of the slide 24. By setting the bearings 210, rotational wear between the connecting rod 27, the brush 26, and the slide 24 can be reduced, facilitating the rotation of the connecting rod 27 and improving the service life of all three components.

[0034] Figure 1-4The replacement mechanism 28 shown includes a bolt 283. A slot 281 is provided on one side of the hollow rod 4, with one end of the threaded hollow rod 21 inserted into the inner wall of the slot 281. Threaded holes 282 are symmetrically provided on the inner wall of the slot 281, with one end of the bolt 283 screwed into the inner wall of one end of the threaded hollow rod 21 and the inner wall of the threaded hole 282. By providing the replacement mechanism 28, when it is necessary to install the replaced threaded hollow rod 21 and brush 26 onto the hollow rod 4, one end of the threaded hollow rod 21 can be inserted into the slot 281, and then the bolt 283 can be screwed into the threaded hole 282 and the inner wall of the threaded hollow rod 21 to fix them in place. This allows the threaded hollow rod 21 and brush 26 to be fixedly installed on one end of the hollow rod 4. Similarly, the reverse operation allows for disassembly for easy replacement and maintenance.

[0035] Figure 1-4 A connecting rope 284 is fixedly installed on one side of the bolt 283, and one end of the connecting rope 284 is fixedly installed on the outer surface of one end of the hollow rod 21 with a threaded hole. By setting the connecting rope 284, the bolt 283 can be limited and fixed on the outer surface of the hollow rod 21 with a threaded hole, so that it is not easy to lose it after being pulled out of the threaded hole 282. Limiting blocks 285 are symmetrically fixedly installed on the outer surface of one end of the hollow rod 21 with a threaded hole. Limiting grooves 286 are symmetrically opened on the inner wall of the slot 281, and the limiting blocks 285 are inserted into the inner wall of the limiting grooves 286. By setting the limiting blocks 285 and the limiting grooves 286, when installing the hollow rod 21 with a threaded hole, the limiting blocks 285 can be aligned with the limiting grooves 286, and then one end of the hollow rod 21 with a threaded hole can be inserted into the slot 281, so that the inner wall of one end of the hollow rod 21 with a threaded hole can be quickly aligned with the threaded hole 282, which facilitates the subsequent installation of the bolt 283 and improves the installation efficiency.

[0036] Working Principle: When using the cleaning machine 1 to clean the inside of the hydraulic cylinder, one end of the hollow rod 21 with the threaded hole can be inserted into the slot 281. Then, the bolt 283 is screwed into the threaded hole 282 and the inner wall of the hollow rod 21 with the threaded hole, fixing it in place. This allows the hollow rod 21 with the threaded hole and the brush 26 to be fixedly installed on one end of the hollow round rod 4. The hydraulic cylinder is then placed on the hollow limit frame 6 for limiting and fixing. The internal drive mechanism of the cleaning machine 1 is then activated, causing the hollow limit frame 6 to slide into the cleaning machine 1. The machine cover is then closed, and the internal drive mechanism is activated again, causing the sliding frame 3 to slide to one end on one side. The hollow round rod 4, several brushes 26, and the spray pipe are inserted into the inside of the hydraulic cylinder. When the hollow round rod 4 is inserted into the inner wall of the hydraulic cylinder, it will also cause the hollow rod 21 with the threaded hole and several brushes 26 to be inserted into the inner wall of the hydraulic cylinder. Then, depending on the size of the inner wall of the hydraulic cylinder, the electric telescopic rod 23 is activated to retract, causing the slide 24 to slide to one end within the inner wall of the hollow rod 21 with the screw hole. Then, the connecting rod 27 is pushed to one end, pushing the brush 26 outward and causing the limiting telescopic rod 25 to stretch until one side of the brush 26 abuts against the inner wall of the hydraulic cylinder. Thus, when the motor 5 drives the hollow rod 4 to rotate, the hollow rod 21 with the screw hole and several brushes 26 can clean the inner wall of the hydraulic cylinder. Through this adjustment, the inner walls of hydraulic cylinders with different inner diameters can be cleaned, improving the compatibility between the brush 26 and the cleaning machine, making it convenient to use. Then, the motor 5 is activated again to drive the hollow rod 4 and the brush 26 to rotate and clean the inside of the hydraulic cylinder. At the same time, the water pump inside the cleaning machine 1 is activated to draw the cleaning fluid at the bottom into the spray pipe through the hose to spray and clean the inner wall of the hydraulic cylinder.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic cylinder barrel cleaning device comprising a cleaning machine (1) and a hollow round bar (4), characterized in that: A sliding frame (3) is slidably installed on one side of the cleaning machine (1). The outer surface of the hollow round rod (4) is installed through one side of the inner wall of the cleaning machine (1) and one side of the sliding frame (3). A motor (5) is fixedly installed on one side of the sliding frame (3). The output end of the motor (5) is fixedly installed on one side of the hollow round rod (4) by means of a coupling. A hollow limit frame (6) is slidably installed on the inner wall of the cleaning machine (1). An adjustment device (2) is provided on one side of the hollow round rod (4). The adjustment device (2) can adjust the distance between several brushes (26) and the screw hole hollow rod (21).

2. A hydraulic cylinder barrel cleaning device according to claim 1, characterized in that: The adjusting device (2) includes a screw hole hollow rod (21), wherein a replacement mechanism (28) is provided between one end of the screw hole hollow rod (21) and one end of the hollow round rod (4), and a plurality of sliding holes (22) are provided on the inner wall of the screw hole hollow rod (21). An electric telescopic rod (23), wherein one end of the electric telescopic rod (23) is fixedly installed on one side of the inner wall of the screw hole hollow rod (21); The slide (24) has its outer surface slidably mounted in the inner wall of the sliding hole (22) and the screw hole hollow rod (21), and one side is fixedly connected to the output end of the electric telescopic rod (23); Several limiting telescopic rods (25), one end of which is fixedly installed on one side of the screw hole hollow rod (21); Several brushes (26), wherein one side of the brushes (26) is fixedly installed on one side of one end of the limiting telescopic rod (25); Several connecting rods (27) are provided, wherein the two ends of the connecting rods (27) are respectively rotatably installed in the inner wall of one side of the brush (26) and the inner wall of the carriage (24).

3. The hydraulic cylinder cleaning device according to claim 2, characterized in that: Several reinforcing rods (29) are fixedly installed on the outer surface of the output end of the electric telescopic rod (23), and one side of several reinforcing rods (29) is fixedly installed on one side of the slide (24).

4. A hydraulic cylinder cleaning device according to claim 2, characterized in that: Bearings (210) are fixedly installed on the outer surfaces of both ends of the connecting rod (27), and the outer rings of the plurality of bearings (210) are respectively fixedly installed on the inner wall of one end of the brush (26) and the inner wall of the slide (24).

5. A hydraulic cylinder cleaning device according to claim 2, characterized in that: The easy-to-replace mechanism (28) includes a bolt (283). A slot (281) is provided on one side of the hollow rod (4). One end of the threaded hollow rod (21) is inserted into the inner wall of the slot (281). Threaded holes (282) are symmetrically provided on the inner wall of the slot (281). One end of the bolt (283) is screwed into the inner wall of one end of the threaded hollow rod (21) and the inner wall of the threaded hole (282).

6. A hydraulic cylinder cleaning device according to claim 5, characterized in that: A connecting rope (284) is fixedly installed on one side of the bolt (283), and one end of the connecting rope (284) is fixedly installed on the outer surface of one end of the hollow rod (21) with the screw hole.

7. A hydraulic cylinder cleaning device according to claim 5, characterized in that: A limiting block (285) is symmetrically fixedly installed on the outer surface of one end of the hollow rod (21) with screw holes. A limiting groove (286) is symmetrically opened on the inner wall of the slot (281). The limiting block (285) is inserted into the inner wall of the limiting groove (286).

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