CN117212299B - Hydraulic cylinder pressing testing device - Google Patents

Abstract

The invention relates to the technical field of pressing test, and discloses a hydraulic cylinder pressing test device, which comprises a switching structure; the switching structure comprises: a rotator whose interior is hollow; the mandrel is rotationally embedded in the revolving body, the top of the mandrel is detachably connected with the rotary power device, and the bottom of the mandrel can be in threaded connection with an oil inlet of the cylinder body to be tested; one end of the connecting pipe is rigidly connected with the revolving body, and the other end of the connecting pipe is communicated with the pressurizing pump; the inner wall of the revolving body is rotatably and hermetically connected with the surface of the mandrel through a thread structure, a liquid gap is arranged at the waist of the thread occlusal surface of the inner wall of the revolving body and the surface of the mandrel, the liquid gap is always communicated with the inner cavity of the connecting pipe, and a curved channel is formed in the mandrel. Through the arrangement, the transmission end of the mandrel can be independently arranged outside the whole circulation system by utilizing the tight fit among the parts, so that the mandrel can be directly installed and detached by using the rotary power device.

Description

Hydraulic cylinder pressure testing device

Technical field

The invention relates to the technical field of pressure testing, and in particular to a hydraulic cylinder pressure testing device.

Background technique

During factory inspection or maintenance inspection, the hydraulic cylinder needs to undergo a pressure test (i.e. pressure test). The general process of the maintenance test process is generally: first, connect the upper chamber mouth of the hydraulic cylinder to the pipeline, and pass high-pressure fluid into the pipeline. Observe the cylinder cover and the lower chamber cylinder mouth on the surface of the movable column to check whether there is any leakage; then connect the lower chamber mouth of the hydraulic cylinder to the pipe and then pass in high-pressure fluid. Observe the upper chamber cylinder mouth and check whether there is any leakage. If not, Liquid leakage indicates that the maintenance is qualified; if there is liquid leakage, determine the seal failure location based on the leakage location, and follow the above process to re-disassemble the movable column, replace the seal, assemble and re-stress until the maintenance is qualified.

For example, the invention patent application with publication number CN113624497A discloses a pressing device for detecting the fault location of a diesel engine of a diesel locomotive, including a first through pipe, a second through pipe and a first plug door; the first through pipe One end of the first pipe is connected to the explosion detection valve of the cylinder head to be detected, the other end of the first pipe is connected to one end of the second pipe, and the other end of the second pipe is connected to high-pressure air equipment; The first plug door is arranged on the second through pipe.

The above-mentioned patent uses a first pipe to connect to the explosion detection valve and then to the inner cavity of the cylinder to be detected. The first pipe and the explosion detection valve are generally connected through an adapter (that is, a threaded sleeve with a sealing ring and a threaded joint). A type of structure), but installing or disassembling the adapter generally requires manual rotation of a part of the rotating joint to be screwed in. Since the joint is connected in the pipe, it is difficult to directly apply force to drive, and manual tools such as wrenches are required. Set on its outer surface for repeated rotation, the efficiency is low.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art mentioned above, at least to a certain extent.

To this end, the present invention provides a hydraulic cylinder pressure testing device, including a transfer structure; the transfer structure includes:

The rotary body is hollow inside;

The core shaft is rotatably embedded inside the rotary body, and its top is detachably connected to the rotary power device, while its bottom can be threadedly connected to the oil inlet of the cylinder under test;

A connecting pipe, one end of which is rigidly connected to the rotary body, and the other end is connected to the pressure pump;

Wherein, the inner wall of the rotary body and the surface of the mandrel are rotatably and sealingly connected through a threaded structure, and a liquid gap is provided at the waist of the thread engagement surface of the two, and the liquid gap is always connected to the inner cavity of the connecting pipe. , a curved channel is provided in the mandrel, so that during its rotation, one end is always connected to the liquid gap and the other end is always connected to the oil inlet of the cylinder under test.

Further, the inner wall of the rotary body is provided with an annular concave structure to form a liquid gap with the circumferential surface of the mandrel;

The circumferential surface of the mandrel is provided with annular protrusions for being embedded in the concave structure of the ring to limit the axial positions of the mandrel and the rotary body.

Further, the bottom of the mandrel is provided with a sealing ring through a groove.

Further, the connecting pipe is always connected to the pressure pump through an adapter.

Furthermore, it also includes a workbench. Two plates are slidably and lockably installed on the workbench through slide rails. Each of the plates is provided with a chute, and each chute slides inside. A clamping bottom plate is installed, and two slide rails are provided on the outside of each clamping bottom plate. A clamping top plate is detachably installed on the top of the two slide rails, and the same side of each said plate body Both are connected with side plates, and a support rod is detachably installed on the same side of the two side plates. A mounting horizontal plate extending toward the center of the workbench is slidably and lockably installed on the support rod. The installation Mounting holes are provided on the horizontal plate to sleeve the rotary body and lock it with the rotary body.

Further, an upper bracket is provided on one side of the workbench close to the side plate, and a suspended mounting platform parallel to the table top of the workbench is installed on the upper bracket, and a driving motor is fixedly installed on the suspended mounting platform. , the output shaft of the drive motor penetrates the suspended installation platform and is fixedly connected to a transmission shaft one, the top end of the transmission shaft one is sleeved with a transmission shaft two so as to be linearly slidable, and the transmission shaft one is connected to the transmission shaft The two transmission shafts are also rotated through spline keyway cooperation. The bottom end of the transmission shaft two is provided with a suspended plate. The center line of the suspended plate is provided with a bearing through it to rotate the transmission shaft two. The suspended plate and the suspended installation platform are also connected through a set of telescopic rods.

Further, a parallel horizontal plate is installed in parallel above the installation horizontal plate, and a driving sleeve is rotatably installed on the parallel horizontal plate. The driving sleeve is set on the top of the mandrel, and the driving sleeve is connected by plugging. The structure is equipped with an elastic transmission shaft, and the top end of the elastic transmission shaft is fixedly connected to the bottom end of the second transmission shaft.

Compared with the prior art, the beneficial effects of the present invention are:

The adapter structure of the present invention first extends the top of the mandrel to the outside of the rotary body, so that the top of the mandrel extends out of the circulation system, and then opens a constant engagement position on the threaded engagement surface of the mandrel and the rotary body. It presents an annular liquid gap, and then uses the liquid gap to always communicate with the inner cavity of the connecting pipe and with the curved channel of a special shape. This can not cut off the circulation system, but also make the mandrel operable outside the system. Ends.

Therefore, the adapter structure of the present invention makes use of the above-mentioned many settings and the close cooperation between various parts, so that the transmission end of the mandrel can be independent of the entire circulation system, so that the rotary power device can be directly used to install the mandrel. and disassembly.

Description of the drawings

Figure 1 is a schematic structural diagram of the prior art;

Figure 2 is a longitudinal view of the switching structure of the present invention;

Figure 3 is a schematic three-dimensional structural diagram of the switching structure of the present invention;

Figure 4 is a front view of the present invention;

Figure 5 is a schematic diagram of the three-dimensional structure of the present invention;

Figure 6 is a schematic diagram of the exploded structure of the plug-in structure of the present invention;

Figure 7 is a schematic structural diagram of the radial projection deforming in an inverted trapezoidal groove according to the present invention.

Reference signs:

1. Adapter; 2. Connecting tube; 3. Mandrel; 4. Rotary body; 5. Threaded structure; 6. Sealing ring; 7. Fixed part; 8. Rotating part; 9. Nut structure; 10. Curved channel; 11. Liquid gap; 12. Workbench; 13. Slide rail one; 14. Plate body; 15. Chute; 16. Clamping bottom plate; 17. Slide rail two; 18. Clamping top plate; 19. Side plate; 20 , support rod; 21. Install horizontal plate; 22. Upper bracket; 23. Suspended mounting platform; 24. Drive motor; 25. Transmission shaft one; 26. Transmission shaft two; 27. Spline; 28. Suspended plate; 29. Bearing; 30. Telescopic rod; 31. Parallel horizontal plate; 32. Drive sleeve; 33. Elastic transmission shaft; 34. Pressure pump; 35. One-way valve; 36. Connecting hose; 37. Liquid tank; 38. Radial convex ; 39. Inverted trapezoidal groove; 40. Monitoring point.

Detailed ways

The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, not all, of the embodiments of the present invention.

In order to better compare the differences between the present invention and the prior art, the present invention provides an example of the prior art. Referring to Figure 1, the adapter in the prior art generally consists of two parts. One is a fixed joint that is fixedly connected to the pipeline. Part 7, the second is the rotary part 8 installed in the fixed part 7, the bottom of the rotary part 8 can be threadedly connected with the oil inlet of the cylinder under test, and the rotary part 8 will have an exposed nut structure 9, artificial During installation, a wrench can be used to rotate the nut structure 9 so that the rotating part 8 is tightly locked with the oil inlet thread. At this time, the rotational connection between the fixed part 7 and the rotating part 8 is also sealed (usually the rotational sealing connection between the two is sealed). Part of it is realized by thread or apron).

As can be seen from the above, the fixed part 7 and the rotating part 8 need to form part of the circulation system, and the circulation system does not have an end that is convenient for operation, and the circulation system cannot be cut off, so it can only be connected to the circulation system through a half set or a full set. Tools such as wrenches on the system need to be repeatedly rotated multiple times to install or disassemble. However, manually using a wrench to repeatedly rotate the nut structure 9 is inefficient.

The invention provides a hydraulic cylinder pressure testing device. Refer to Figures 2 and 3. The device includes a transfer structure. The transfer structure includes: a rotary body 4, which is hollow inside; and a mandrel 3, whose rotation is embedded in the rotary body. Inside the body 4, its top is detachably connected to the rotating power unit, and its bottom can be threadedly connected to the oil inlet of the cylinder under test; the connecting pipe 2 has one end rigidly connected to the rotary body 4, and the other end to the pressure pump. 34 is connected; wherein, the inner wall of the rotary body 4 and the surface of the mandrel 3 are rotatably and sealingly connected through the thread structure 5, and a liquid gap 11 is provided at the waist of the thread engagement surface of the two, and the liquid gap 11 is always connected to the connecting pipe 2 The inner cavity of the core shaft 3 is connected, and a curved channel 10 is provided in the mandrel 3, so that during its rotation, one end is always connected to the liquid gap 11 and the other end is always connected to the oil inlet of the cylinder under test.

Specifically, the adapter structure of the present invention first extends the top of the mandrel 3 to the outside of the rotary body 4, so that the top of the mandrel 3 extends out of the circulation system, and then connects the mandrel 3 and the rotary body 4. An annular liquid gap 11 is opened at the constant meshing position of the threaded meshing surface (referring to the part where the two always mesh during the entire rotation. This setting can ensure sealing), and then the liquid gap 11 is used to always connect with the inner part of the connecting pipe 2 The cavity is connected and connected with the specially shaped curved channel 10 (an inverted L shape in the embodiment shown in Figure 2), which allows the mandrel 3 to have an operable end outside the system without cutting off the circulation system. department.

In summary, the adapter structure of the present invention uses the above-mentioned many settings and utilizes the close cooperation between various parts, so that the transmission end of the mandrel 3 (ie, the top end of this embodiment) can be independent of the entire circulation system, so that it can Directly use a rotary power device (such as a hexagonal electric screwdriver) to install and disassemble the mandrel 3 (note that the transmission end of the mandrel 3 needs to be configured in a shape that matches the hexagon at this time).

When workers directly use tools such as electric screwdrivers to rotate the mandrel 3, it is easy for the mandrel 3 to make too many or too few rotations: when the mandrel 3 rotates too many or too few times, the curved channel 10 on it will When it is already misaligned with the liquid gap 11, or is misaligned with the liquid gap 11 again during the subsequent rotation, the circulation system is cut off; therefore, the present invention also makes the following restrictions: the inner wall of the rotary body 4 is provided with an annular concave structure to connect with the core The circumferential surface of the shaft 3 forms a liquid gap 11; the circumferential surface of the mandrel 3 is provided with annular protrusions for being embedded in the concave structure of the ring to limit the axial positions of the mandrel 3 and the rotary body 4. In this way, the number of rotations of the core shaft 3 can be limited by the cooperation of the ring convex and ring concave structures.

In order to make the threaded connection between the bottom of the mandrel 3 and the oil inlet of the cylinder under test better sealed, the bottom of the mandrel 3 is equipped with a sealing ring 6 through a groove, and the elastic deformation of the sealing ring 6 improves the overall of sealing.

The connecting pipe 2 is always connected to the pressure pump 34 through the adapter 1, so that the connecting pipe 2 can be connected to a pipe with a larger diameter through the adapter 1.

Although manual tools such as electric screwdrivers can be used to directly operate the mandrel 3, the cylinder under test needs to be fixed in advance. If it is a maintenance test, the cylinder itself may be fixed, and if the cylinder is shipped from the factory, it needs to be fixed. In addition, the cylinder body is fixed in advance, so that the two steps of fixing the cylinder body and the driving spindle 3 need to be operated separately. Therefore, the entire operation process lacks coordination and is not efficient. For this reason, the present invention also provides the following structure:

Referring to Figures 4 and 5, the present invention also includes a workbench 12. Two plates 14 are slidably and lockably mounted on the workbench 12 through a slide rail 13. Each plate 14 is provided with a slide groove 15. A clamping bottom plate 16 is slidably installed in each chute 15. The clamping bottom plate 16 can be slid or locked in the chute 15 by pneumatic or hydraulic drive; and each clamping bottom plate 16 is provided with a Slide rail two 17, a clamping top plate 18 is detachably installed on the top of slide rail two 17. The clamping top plate 18 can be slid or locked on slide rail two 17 through pneumatic or hydraulic drive, and each The same side of the plate body 14 (the inner side in Figure 5) is connected to a side plate 19. The two side plates 19 are detachably installed with a support rod 20 on the same side. The support rod 20 is slidably and lockably installed with a directional working rod. A mounting horizontal plate 21 extends from the center of the platform 12. The mounting horizontal plate 21 is provided with mounting holes for socketing the rotary body 4 and locking it with the rotary body 4.

On the other hand, an upper bracket 22 is provided on the side of the workbench 12 close to the side plate 19. A suspended mounting platform 23 parallel to the surface of the workbench 12 is installed on the upper bracket 22. A driver is fixedly installed on the suspended mounting platform 23. The output shaft of the motor 24 (generally a servo motor) runs through the suspended mounting platform 23 and is fixedly connected to a transmission shaft 25. The top of the transmission shaft 25 is sleeved with a transmission shaft 26 that can slide linearly, and the transmission shaft 26 is The shaft one 25 and the transmission shaft two 26 are also rotated through the keyway cooperation of the splines 27. The bottom end of the transmission shaft two 26 is provided with a suspended plate 28. The center line of the suspended plate 28 is provided with a bearing 29 through which the transmission shaft is rotated. 26, and the suspended plate 28 and the suspended mounting platform 23 are also connected through a set of telescopic rods 30.

In addition, a parallel horizontal plate 31 is installed in parallel above the installation horizontal plate 21. A driving sleeve 32 is rotatably installed on the parallel horizontal plate 31. The driving sleeve 32 is set on the top of the core shaft 3. The driving sleeve 32 is installed through a plug-in structure. There is an elastic transmission shaft 33, and the top end of the elastic transmission shaft 33 is fixedly connected with the bottom end of the second transmission shaft 26.

The advantage of using the elastic transmission shaft 33 is that when the present invention faces a variety of oil cylinders with different oil inlet positions in the horizontal position, the position of the horizontal plate 21 installed on the support rod 20 can be adjusted to make the mandrel 3 is aligned with the oil inlets located at different horizontal positions, but this will cause the installation horizontal plate 21 and the suspended plate 28 to be offset in the horizontal direction, and the elastic transmission shaft 33 can cooperate with the telescopic rod 30, the transmission shaft 25 and the In the case of telescopic displacement of the second transmission shaft 26, the offset in the horizontal position is compensated by bending itself to varying degrees.

On the other hand, the elastic transmission shaft 33 can have slight elasticity, which can prevent the core shaft 3 from excessive deflection through its own deformation when the core shaft 3 undergoes a certain degree of excessive deflection. Although the excessive deflection of the core shaft 3 will cause the ring to bulge. It is limited by the concave structure of the ring, but this excessive deflection will bring a greater load to the structure itself and the motor output shaft.

In the above structure, the side plate 19 can realize the horizontal sliding and longitudinal sliding and locking of the support rod 20 through the pneumatic clamp and the matching chute 15. In the present invention, there are many similar sliding and locking structures, and generally pneumatic can be used. The implementation of the clamp and the matching chute 15 belongs to the existing technology and will not be described in detail.

Specifically, with reference to Figures 6 and 7, the plug-in structure is divided into radial protrusions 38 formed by slotting on the plug-in part of the elastic drive shaft 33, and the drive sleeve 32 is hollow and is provided with a groove on its inner wall. There is an inverted trapezoidal groove 39, and the radial protrusion 38 can be nested in the inverted trapezoidal groove 39. The difference between the two and the conventional convex groove is that the tops of the driving sleeves 32 of the two are not closely matched, but use the inverted trapezoidal groove 39. The special shape causes a gap with a slope between the upper end of the radial protrusion 38 and the upper end of the inverted trapezoidal groove 39 .

Since the radial protrusion 38 is easier to deform than the elastic transmission shaft 33 as a whole, on the one hand, the gap on the slope can be used as a space for the radial protrusion 38 to deform when the drive motor 24 over-drives and rotates. A certain degree of misalignment occurs at each monitoring point 40, which facilitates feedback to the equipment for automatic braking.

On the other hand, the inclined plane gap facilitates the protrusion 38 to escape after excessive deformation, thereby preventing the equipment from being damaged in an accident.

Working principle: First remove the clamping top plate 18, and then adjust the distance between the two plates 14 to adapt to the length of the cylinder to be tested, thereby ensuring that the end of the cylinder to be tested can be clamped. hold;

Then, place the cylinder under test between the two pairs of clamping bottom plates 16 on the left and right. Since each pair of clamping bottom plates 16 is squeezed simultaneously by air pressure or hydraulic pressure, each pair of clamping bottom plates 16 is pressed from both sides to the middle. Therefore, the cylinder under test can be automatically clamped on the longitudinal center axis of the workbench 12, and at the same time, the clamping top plate 18 simultaneously fixes the upper surface of the cylinder under test based on the same principle;

Then, adjust the clamping top plate 18 to the same height as the oil inlet of the cylinder under test, and then lock the clamping top plate 18 to the side plate 19. At this time, the installation horizontal plate 21 just fits on the cylinder under test. The upper end surface of the oil inlet, and at the same time, the bottom end of the mandrel 3 sleeved in the rotary body 4 is exactly located at the upper end surface of the oil inlet of the cylinder under test;

Next, through the expansion and contraction of the two telescopic rods 30, the distance between the suspended plate 28 and the parallel horizontal plate 31 is adjusted to avoid excessive bending of the elastic transmission shaft 33. The elastic transmission shaft 33 is generally made of a slightly elastic plastic material. It has rotational transmission capability and a certain bending transmission capability;

Then open the switch of the drive motor 24 to cause the output shaft of the drive motor 24 to rotate. The rotation of the output shaft can be transmitted to the drive sleeve 32 through the transmission shaft one 25, the transmission shaft two 26, and the elastic transmission shaft 33. Then the drive sleeve 32 The spindle 3 is caused to rotate, and then the rotation of the spindle 3 is acted upon by the thread between it and the rotary body 4 into a precession action, and is finally inserted into the oil inlet of the cylinder under test. The drive sleeve 32 has a certain length to Ensure that the top end of the mandrel 3 can slide linearly in the drive sleeve 32 to complete the precession action without breaking away from the drive sleeve 32;

At this time, by turning on the switch of the pressure pump 34 located under the workbench 12, the pressure pump 34 is connected to the adapter 1 through the one-way valve 35 and the connecting hose 36, and the pressure pump 34 pumps the liquid in the liquid tank 37 into Test inside the cylinder being tested;

After completing the test, by controlling the driving motor 24 to rotate in the opposite direction, the bottom end of the mandrel 3 can be completely rotated out, and then the cylinder under test can be directly removed.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

Claims (7)

1. A hydraulic cylinder pressure testing device, including a transfer structure, characterized in that: the transfer structure includes: The rotary body (4) is hollow inside; The mandrel (3) is rotatably embedded inside the rotary body (4), and its top is detachably connected to the rotary power device, while its bottom can be threadedly connected to the oil inlet of the cylinder under test; The connecting pipe (2) has one end rigidly connected to the rotor (4) and the other end connected to the pressure pump (34); Among them, the inner wall of the rotary body (4) and the surface of the mandrel (3) are rotatably and sealingly connected through a threaded structure (5), and a liquid gap (11) is provided at the waist of the threaded engagement surfaces of the two. The liquid gap (11) is always connected to the inner cavity of the connecting pipe (2), and a curved channel (10) is provided in the mandrel (3) so that one end is always connected to the liquid gap (11) during its rotation. The other end is always connected to the oil inlet of the cylinder under test. 2. The hydraulic cylinder pressure testing device according to claim 1, characterized in that the inner wall of the rotary body (4) is provided with an annular concave structure to form a liquid gap (11) with the circumferential surface of the mandrel (3). ); The circumferential surface of the mandrel (3) is provided with annular protrusions for being embedded in the concave structure of the ring to limit the axial positions of the mandrel (3) and the rotary body (4). . 3. The hydraulic cylinder pressure testing device according to claim 2, characterized in that the bottom of the mandrel (3) is provided with a sealing ring (6) through a groove. 4. The hydraulic cylinder pressure testing device according to claim 3, characterized in that the connecting pipe (2) is always connected to the pressure pump (34) through the adapter (1). 5. The hydraulic cylinder pressure testing device according to claim 4, characterized in that it also includes a workbench (12), on which two sliding rails (13) are slidably and lockably installed. Each plate body (14) is provided with a chute (15), and a clamping bottom plate (16) is slidably installed in each chute (15), and each Two slide rails (17) are provided on the outside of the clamping bottom plate (16), and a clamping top plate (18) is detachably installed on the top of the two slide rails (17), and each plate body Side plates (19) are connected to the same side of (14), and a support rod (20) is detachably installed on the same side of the two side plates (19). The support rod (20) is slidable and lockable. A mounting horizontal plate (21) extending toward the center of the workbench (12) is installed. The mounting horizontal plate (21) is provided with mounting holes to sleeve the rotary body (4) and connect with the rotary body (4). 4) Phase lock. 6. The hydraulic cylinder pressure testing device according to claim 5, characterized in that an upper bracket (22) is provided on the side of the workbench (12) close to the side plate (19), and the upper bracket (22) is 22) is installed with a suspended mounting platform (23) parallel to the table top of the workbench (12). A driving motor (24) is fixedly installed on the suspended mounting platform (23). The driving motor (24) The output shaft penetrates the suspended installation platform (23) and is fixedly connected with the transmission shaft one (25). The top end of the transmission shaft one (25) is sleeved with the transmission shaft two (26) so as to be linearly slidable. The first transmission shaft (25) and the second transmission shaft (26) are also rotated through the keyway cooperation of the spline (27). The bottom end of the second transmission shaft (26) is provided with a suspended plate (28). The center line of the suspended plate (28) is provided with a bearing (29) to rotate and install the second transmission shaft (26), and there is also a gap between the suspended plate (28) and the suspended installation platform (23). Set telescopic rod (30) connection. 7. The hydraulic cylinder pressure testing device according to claim 6, characterized in that a parallel horizontal plate (31) is also installed in parallel above the installation horizontal plate (21), and the parallel horizontal plate (31) A driving sleeve (32) is rotatably installed, and the driving sleeve (32) is sleeved on the top of the mandrel (3). The driving sleeve (32) is equipped with an elastic transmission shaft (33) through a plug-in structure, so The top end of the elastic transmission shaft (33) is fixedly connected to the bottom end of the second transmission shaft (26).