Pressure-bearing test equipment for rubber sealing element

Abstract

The invention relates to the technical field of rubber sealing element pressure-bearing tests, and discloses a rubber sealing element pressure-bearing test device which comprises a base, the top of the base is fixedly connected with a stand column, and the top end of the stand column is fixedly provided with a connecting frame. According to the invention, the rubber sealing element is plugged into the limiting ring in advance, and then the sliding block is pressed to drive the locking shaft to elastically deform on the elastic U-shaped clamp, so that the buckling pin on the locking shaft is clamped with the clamping pin groove in the fixed palm, and the positioning rod on the sliding block is enabled to be opposite to the positioning hole in the rubber sealing element; the positioning rod is inserted into the sealing pressure cavity, so that the rubber sealing piece is limited, and the situation that when the pressure in the sealing pressure cavity is too small, air pressure directly makes contact with the rubber sealing piece at the sealing position and continuously impacts the rubber sealing piece under the action of the air pressure and the air flow speed, and the rubber sealing piece falls off at the position is avoided; and the pressure-bearing detection efficiency of the rubber sealing element is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of pressure test of rubber seals, in particular to pressure test equipment for rubber seals. Background Art

[0002] Rubber seals are generally round rubber products, mainly used for leak prevention. They have high elasticity and slight plasticity at room temperature, very good mechanical strength, small hysteresis loss, and low heat generation during multiple deformations, so they are also very resistant to flexing. And because they are non-polar rubber, they have good electrical insulation properties and can be used for leak-proof sealing in a variety of places and environments. In order to detect the pressure limit of rubber seals, they need to be tested.

[0003] The current Chinese patent announcement number is CN115420491B, which discloses a rubber seal pressure test device. The present invention tests the maximum oil pressure that the rubber seal can withstand through the coordination of the positioning unit and the matching unit, thereby improving the accuracy of the test results. The discharged high-pressure oil is filtered and reused to avoid waste. At the same time, the fluidity of the high-pressure oil is guaranteed, and no pollution is generated during the entire experiment. The detection process is recorded by a high-frequency camera. During the entire experiment, there is no need to stop the pressurized oil supply of the oil supply system, thereby improving the experimental efficiency of the equipment and facilitating subsequent inspections through video.

[0004] However, when using the above-mentioned test system to test rubber seals, the following problems exist: during the installation of the rubber seals, the pressure value in the sealing pressure chamber is not set. If the pressure in the sealing pressure chamber exceeds its tolerable range, the sealing end face pressure will increase, which will make it difficult to form a better liquid film, and even cause serious wear of the end face. At the same time, the heat generation will increase, causing the rubber seal to deform. On the contrary, if the pressure in the sealing pressure chamber is too small, the air pressure will directly contact the rubber seal at the sealing point, and under the action of air pressure and gas flow rate, it will continuously impact the rubber seal, causing the rubber seal to fall off. No limit mechanism is set, which reduces the pressure detection efficiency of the rubber seal. When the working pressure fluctuates, the elastic deformation and sealing effect will be negatively affected, and the leakage will also change with the change of pressure.

[0005] Therefore, we propose a new pressure test equipment for rubber seals. Summary of the invention

[0006] The purpose of the present invention is to provide a pressure test device for rubber seals to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a pressure test equipment for rubber seals, comprising a base, a column fixedly connected to the top of the base, a connecting frame fixedly installed on the top of the column, and a control panel fixedly installed through the connecting frame, and a pressure test assembly is arranged on the top of the base.

[0008] Preferably, the pressure test assembly includes the following structure: a pressure test cylinder, which is arranged on the top of the base; a pressure chamber is opened inside the pressure test cylinder, and a pressure sensor electrically connected to the control panel is installed in the pressure chamber, an oil supply pipeline is connected to one side of the inner wall of the pressure chamber, oil grooves are equidistantly opened at the middle position of the inner wall of the pressure chamber, a pressure relief hole is opened on the left side of the top of the inner wall of the pressure chamber, wherein a pressure relief valve mouth is installed in the pressure relief hole, a movable seat is connected to one side of the inner side of the pressure relief valve mouth, and the movable seat is movably connected to a rubber flap through a torsion spring, and a guide cam is integrally connected to the other side of the inner side of the pressure relief valve mouth, and the rubber flap is tilted forty-five degrees and placed on the guide cam, so that the pressure chamber is temporarily sealed from the outside through the rubber flap.

[0009] Preferably, the pressure test assembly also includes the following structure: an oil return pipe, which is connected and arranged on the other side of the inner wall of the pressure chamber; a reflux pump, which is fixedly installed on the top of the base; a stop cap is sealed and installed on the outer end of the oil return pipe, and a downstream cavity is opened on the bottom of the oil return pipe and the pressure test cylinder, and a pump pipe is connected to the downstream cavity, and the bottom end of the pump pipe is connected to the input end of the reflux pump, and the output end of the reflux pump is connected to a reflux pipe, and the reflux pipe is connected to the bottom of the oil supply pipeline through a one-way check valve.

[0010] Preferably, a movable sealing block is slidably provided inside the inner end of the oil return pipeline, a stop spring is fixedly connected between one side of the movable sealing block and the stop cap, and a stop block is fixedly connected inside the oil return pipeline.

[0011] Preferably, male magnets are equidistantly installed on one side of the movable sealing block, and female magnets are equidistantly installed on one side of the stop block, and the male magnets and female magnets attract each other.

[0012] Preferably, a limiting mechanism is arranged outside the pressure test cylinder, and the limiting mechanism comprises a rubber seal, a fixing cylinder, a limiting ring and a limiting element; The outer surface of the rubber seal is fixedly connected to the inner wall of the fixed cylinder, and the fixed cylinder is sleeved on the outside of the pressure test cylinder. Limiting rings are installed on both sides of the rubber seal. The inner circumference of the limiting ring is equidistantly provided with release grooves, and a snap-off body is integrally formed to match the inner side of the rubber seal. Positioning holes are equidistantly provided on both sides of the rubber seal. There are multiple groups of limiting elements, which are equidistantly arranged on the outside of the limiting ring.

[0013] Preferably, the limiting element includes the following structure: a connecting block, fixedly mounted on the outside of the limiting ring; a recess, integrally mounted on the top of the connecting block; a fixed palm, arranged on the front side of the connecting block; a fixed shaft is fixedly mounted on the surface of the connecting block, and a convex ring is fixedly mounted through the fixed shaft, and the convex ring is integrally mounted on the fixed palm, and a foot groove that engages with a snap foot is provided on the top of the fixed palm.

[0014] Preferably, relaxation holes are provided on both sides of the recess, and a toggle rod is built in the relaxation holes, one end of the toggle rod is fixedly connected to a sliding block, the outer wall of the toggle rod is sleeved with a compression spring, one end of the compression spring is fixedly connected to one side of the sliding block, the other end of the compression spring is fixedly connected to the inner side of the recess, a connecting hole matching the positioning hole is provided in the sliding block, and a positioning rod matching the positioning hole is built in the connecting hole; a locking shaft is movably connected to the surface of the recess, the other end of the locking shaft is integrally connected with a buckle foot, the top outer wall of the locking shaft is in sliding contact with the sliding block, an elastic U-shaped clip is provided between the bottom of the locking shaft and the connecting block, and the elastic U-shaped clip is movably connected to the surface of the recess.

[0015] The present invention provides a pressure test device for rubber seals, which has the following beneficial effects: (1) When the pressure value set by the pressure sensor is too large, the present invention feeds back a signal to the control panel, indicating that pressure relief is required. At this time, the valve plug on the pressure relief valve mouth is opened, and the air pressure will hit the rubber flap, which will be opened to achieve pressure relief. Finally, after the internal and external pressures are in a balanced state, the rebound force of the stop spring will be greater than the magnetic force, which will eliminate the attracted state of the male magnet and the female magnet, thereby pushing the movable sealing block to move leftward in the return oil pipeline, and the downstream cavity is closed.

[0016] (2) According to the present invention, as the oil pressure increases, the movable sealing block will be pushed to the right in the oil return pipe. At this time, the stop spring is compressed until the male magnet and the female magnet are attracted to each other. At this time, the rebound force of the stop spring is insufficient to reduce the oil pressure and the magnetic force. Therefore, the stop spring will always be in a compressed state, and the downstream cavity will be opened.

[0017] (3) The present invention inserts the rubber seal into the limiting ring in advance, and then presses the sliding block. The sliding block drives the locking shaft to elastically deform the elastic U-shaped clamp, so that the buckle foot on the locking shaft engages with the foot groove on the fixed palm, thereby causing the positioning rod on the sliding block to be aligned with the positioning hole on the rubber seal, and inserting the positioning rod therein, so that the rubber seal is limited, avoiding the pressure in the sealing pressure chamber being too low, and the air pressure directly contacting the rubber seal at the sealing position, and continuously impacting the rubber seal under the action of air pressure and gas flow rate, causing the rubber seal at that position to fall off. No limiting mechanism is set, which reduces the pressure detection efficiency of the rubber seal.

[0018] (4) By starting the reflux pump, the present invention allows the oil to flow from the downstream cavity and along the pump pipe, the reflux pipe, and the oil supply pipeline and then enter the pressure chamber again (the oil supply pipeline no longer supplies oil at this time), thereby achieving the effect of oil circulation. The maximum oil pressure that the rubber seal can withstand can be repeatedly tested, thereby improving the efficiency of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of the overall structure of the present invention; Figure 2 It is a back view of the overall structure of the present invention; Figure 3 It is a front cross-sectional view of the overall structure of the present invention; Figure 4 For the present invention Figure 3 A is a schematic diagram of the enlarged structure of the middle part; Figure 5 For the present invention Figure 3 A schematic diagram of the enlarged structure of B; Figure 6 The structural view of the limiting mechanism of the present invention Figure 7 It is a schematic diagram of the structure decomposition of the limit mechanism of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure of C in the figure.

[0020] In the figure: 111 base, 112 column, 113 connecting frame, 114 control panel, 2 pressure test assembly, 211 pressure test cylinder, 212 pressure chamber, 213 pressure sensor, 214 oil supply pipeline, 215 oil groove, 216 pressure relief hole, 217 pressure relief valve mouth, 218 movable seat, 219 rubber flap, 2110 flow guide convex falcon, 221 oil return pipeline, 222 stop cap, 223 downstream cavity, 224 pump pipe, 225 reflux pump, 226 reflux pipe, 227 one-way stop Return valve, 228 movable sealing block, 229 stop spring, 2210 stop block, 2211 male magnet, 2212 female magnet, 3 limit mechanism, 311 rubber seal, 312 fixed cylinder, 313 limiting ring, 32 limiting element, 321 connecting block, 322 recess, 323 toggle rod, 324 sliding block, 325 compression spring, 326 positioning rod, 327 locking shaft, 328 buckle foot, 329 elastic U-clip, 3210 fixed palm, 3211 convex ring, 3212 fixed shaft. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an 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 the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Embodiment 1: A preferred embodiment of a pressure test device for a rubber seal provided by the present invention is as follows: Figure 1-8As shown: a pressure test device for rubber seals, comprising a base 111, a column 112 is fixedly connected to the top of the base 111, a connecting frame 113 is fixedly installed on the top of the column 112, and a control panel 114 is fixedly installed through the connecting frame 113, and a pressure test assembly 2 is arranged on the top of the base 111; Specifically, the pressure test assembly 2 includes the following structures: a pressure test cylinder 211, which is arranged on the top of the base 111; A pressure chamber 212 is provided inside the pressure test cylinder 211, and a pressure sensor 213 electrically connected to the control panel 114 is built in the pressure chamber 212. An oil supply pipeline 214 is connected to one side of the inner wall of the pressure chamber 212. Oil grooves 215 are equidistantly provided at the middle position of the inner wall of the pressure chamber 212. A pressure relief hole 216 is provided on the left side of the top of the inner wall of the pressure chamber 212, wherein a pressure relief valve mouth 217 is built in the pressure relief hole 216. A movable seat 218 is connected to one side of the inner side of the pressure relief valve mouth 217, and a rubber flap 219 is movably connected to the movable seat 218 through a torsion spring. A flow guide cam 2110 is integrally connected to the other side of the inner side of the pressure relief valve mouth 217. The rubber flap 219 is placed on the flow guide cam 2110 at an angle of 45 degrees, so that the pressure chamber 212 is temporarily sealed from the outside through the rubber flap 219. In this embodiment, when the pressure value set by the pressure sensor 213 is too large, a signal is fed back to the control panel 114, and pressure relief is required. At this time, the valve plug on the pressure relief valve mouth 217 is opened, and the air pressure will collide with the rubber flap 219, and the rubber flap 219 is opened, thereby achieving pressure relief. Finally, after the internal and external pressures are in a balanced state, the rebound force of the stop spring 229 will be greater than the magnetic force, and the male magnet 2211 and the female magnet 2212 will be eliminated. The attracted state, thereby pushing the movable sealing block 228 to move to the left in the return oil pipeline 221, and the downstream cavity 223 is closed.

[0025] Example 2: Please refer to Figure 1-Figure 8 , and on the basis of Example 1, it is further obtained that: Specifically, the pressure test assembly 2 also includes the following structures: a return oil pipeline 221, which is connected and arranged on the other side of the inner wall of the pressure chamber 212; a reflux pump 225, which is fixedly installed on the top of the base 111; The outer end of the return oil pipeline 221 is sealed with a stop cap 222, and the bottom of the return oil pipeline 221 and the pressure test cylinder 211 are provided with a downflow cavity 223, and the downflow cavity 223 is connected with a pump pipe 224, and the bottom end of the pump pipe 224 is connected with the input end of the return pump 225, and the output end of the return pump 225 is connected with a return pipe 226, and the return pipe 226 is connected with the bottom of the oil supply pipeline 214 through a one-way check valve 227; A movable sealing block 228 is slidably disposed inside the inner end of the oil return pipe 221, a stop spring 229 is fixedly connected between one side of the movable sealing block 228 and the stop cap 222, and a stop block 2210 is fixedly connected inside the oil return pipe 221; Male magnets 2211 are installed equidistantly on one side of the movable sealing block 228, and female magnets 2212 are installed equidistantly on one side of the stop block 2210. The male magnets 2211 and the female magnets 2212 attract each other. In this embodiment, as the oil pressure increases, the movable sealing block 228 will be pushed to move rightward in the oil return pipe 221. At this time, the stop spring 229 is compressed until the male magnet 2211 and the female magnet 2212 are attracted to each other. At this time, the rebound force of the stop spring 229 is insufficient to reduce the oil pressure and the magnetic force, so the stop spring 229 will always be in a compressed state, so that the downstream cavity 223 is opened; In this embodiment, the effect of opening or closing the downstream cavity 223 is achieved by moving the sealing block 228, the stop spring 229, and the cooperation between the male magnet 2211 and the female magnet 2212.

[0026] Example 3: Please refer to Figure 1-Figure 8 , and on the basis of Example 1, it is further obtained that: a limiting mechanism 3 is arranged outside the pressure test cylinder 211, and the limiting mechanism 3 includes a rubber seal 311, a fixed cylinder 312, a limiting ring 313 and a limiting element 32; the outer surface of the rubber seal 311 is fixedly connected to the inner wall of the fixed cylinder 312, and the fixed cylinder 312 is sleeved on the outside of the pressure test cylinder 211, and limiting rings 313 are installed on both sides of the rubber seal 311, and the inner circumference of the limiting ring 313 is equidistantly provided with release grooves, and a snap-off body is integrally formed, which is adapted to the inner side of the rubber seal 311, and positioning holes are equidistantly provided on both sides of the rubber seal 311. A plurality of limiting elements 32 are arranged, and the limiting elements 32 are equidistantly arranged on the outer side of the limiting ring 313; In this embodiment, the rubber seal 311 is pre-inserted into the limiting ring 313, and then the sliding block 324 is pressed. The sliding block 324 drives the locking shaft 327 to elastically deform the elastic U-shaped clamp 329, so that the buckle foot 328 on the locking shaft 327 engages with the foot groove on the fixed palm 3210, thereby prompting the positioning rod 326 on the sliding block 324 to be aligned with the positioning hole on the rubber seal 311, and the positioning rod 326 is inserted therein, so that the rubber seal 311 is limited to avoid the pressure in the sealing pressure chamber being too low, the air pressure directly contacts the rubber seal at the sealing point, and under the action of air pressure and gas flow rate, continuously impacts the rubber seal, causing the rubber seal at that point to fall off. No limiting mechanism is set, which reduces the efficiency of pressure detection of the rubber seal.

[0027] Example 4: Please refer to Figure 1-Figure 8 , and on the basis of Example 1, it is further obtained that: Specifically, the limiting element 32 includes the following structure: a connecting block 321, fixedly installed on the outside of the limiting ring 313; a recess 322, integrally installed on the top of the connecting block 321; a fixed palm 3210, arranged on the front of the connecting block 321; Relaxation holes are provided on both sides of the recess 322, and a toggle rod 323 is built into the relaxation hole. One end of the toggle rod 323 is fixedly connected to a sliding block 324. A compression spring 325 is sleeved on the outer wall of the toggle rod 323. One end of the compression spring 325 is fixedly connected to one side of the sliding block 324, and the other end of the compression spring 325 is fixedly connected to the inner side of the recess 322. A connecting hole matching the positioning hole is provided in the sliding block 324, and a positioning rod 326 matching the positioning hole is built into the connecting hole. The surface of the recess 322 is movably connected with a locking shaft 327, and the other end of the locking shaft 327 is integrally connected with a buckle foot 328. The top outer wall of the locking shaft 327 is in sliding contact with the sliding block 324. An elastic U-shaped clip 329 is provided between the bottom of the locking shaft 327 and the connecting block 321. The elastic U-shaped clip 329 is movably connected to the surface of the recess 322. A fixed shaft 3212 is fixedly installed on the surface of the connecting block 321 , and a convex ring 3211 is fixedly installed through the fixed shaft 3212 , and the convex ring 3211 is integrally installed on the fixed palm 3210 , and a foot groove engaged with the buckle foot 328 is opened on the top of the fixed palm 3210 .

[0028] In this embodiment, when it is necessary to remove the limiting ring 313, the positioning rod 326 is pulled out in advance, and then the toggle rod 323 is pulled. When the compression spring 325 is compressed, the toggle rod 323 drives the sliding block 324 to slide on the top of the locking shaft 327, and then, under the action of the rebound force of the elastic U-shaped clip 329, the buckle foot 328 on the locking shaft 327 is disengaged from the foot groove on the fixed palm 3210, so that the limiting ring 313 can be removed.

[0029] When in use, after starting the power supply, the external oil supply equipment is used to transport the oil through the oil pump along the oil supply pipeline 214 to the pressure chamber 212. As the pressure increases, the value on the pressure sensor 213 changes, and the oil fully contacts the rubber seal 311 along the oil groove 215. At this time, the rubber seal 311 is subjected to the oil pressure. The degree of oil pressure borne by the rubber seal 311 is monitored in real time through the increased oil pressure, and the signal is transmitted to the control panel 114. As the oil pressure increases, the movable sealing block 228 will be pushed to move rightward in the oil return pipeline 221. At this time, the stop spring 229 is compressed until the male magnet 2211 and the female magnet 2212 are attracted (at this time, the rebound force of the stop spring 229 is insufficient to reduce the oil pressure and magnetic force, so the stop spring 229 will always be in a compressed state. When the pressure value set by the pressure sensor 213 is too large , the signal is fed back to the control panel 114, and pressure relief is required. At this time, the valve plug on the pressure relief valve mouth 217 is opened, and the air pressure will collide with the rubber flap 219, and the rubber flap 219 is opened, thereby achieving pressure relief. Finally, after the internal and external pressures are in a balanced state, the rebound force of the stop spring 229 will be greater than the magnetic force, and the male magnet 2211 and the female magnet 2212 will be eliminated. The attracted state, thereby pushing the movable sealing block 228 to move leftward in the return oil pipeline 221, and the downstream cavity 223 is closed). At this time, the downstream cavity 223 is opened. At this time, the reflux pump 225 is started, and the oil can enter the pressure chamber 212 again from the downstream cavity 223 and along the pump pipe 224, the reflux pipe 226, and the oil supply pipeline 214 (the oil supply pipeline 214 no longer supplies oil at this time), thereby realizing the effect of oil circulation, and the maximum oil pressure that the rubber seal 311 can withstand can be repeatedly tested, thereby improving the efficiency of the test.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressure test device for a rubber seal, comprising a base (111), characterized in that: The top of the base (111) is fixedly connected to a column (112), the top of the column (112) is fixedly mounted with a connecting frame (113), and a control panel (114) is fixedly mounted via the connecting frame (113), and a pressure test assembly (2) is provided on the top of the base (111).

2. The pressure test equipment for rubber seals according to claim 1, characterized in that: The pressure test assembly (2) comprises the following structure: A pressure test cylinder (211) is arranged on the top of the base (111); The pressure-bearing test cylinder (211) has a pressure chamber (212) formed inside, and the pressure chamber (212) has a built-in pressure sensor (213) electrically connected to the control panel (114); an oil supply pipeline (214) is provided on one side of the inner wall of the pressure chamber (212); oil grooves (215) are formed at equal intervals on the circumference of the middle position of the inner wall of the pressure chamber (212); a pressure relief hole (216) is formed on the left side of the top of the inner wall of the pressure chamber (212); A pressure relief valve mouth (217) is built into the hole (216); one side of the interior of the pressure relief valve mouth (217) is connected to a movable seat (218), and the movable seat (218) is movably connected to a rubber flap (219) via a torsion spring; the other side of the interior of the pressure relief valve mouth (217) is integrally connected to a flow guide convex falcon (2110); the rubber flap (219) is placed on the flow guide convex falcon (2110) at an angle of forty-five degrees, so that the pressure-bearing chamber (212) is temporarily sealed from the outside through the rubber flap (219).

3. The pressure test equipment for rubber seals according to claim 1, characterized in that: The pressure test assembly (2) also includes the following structure: An oil return pipeline (221) is arranged in communication with the other side of the inner wall of the pressure-bearing chamber (212); A reflux pump (225) is fixedly mounted on the top of the base (111); The outer end of the oil return pipeline (221) is sealed with a stop cap (222), the bottom of the oil return pipeline (221) and the pressure test cylinder (211) are provided with a downflow cavity (223), the downflow cavity (223) is connected to a pump pipe (224), the bottom end of the pump pipe (224) is connected to the input end of a reflux pump (225), the output end of the reflux pump (225) is connected to a reflux pipe (226), and the reflux pipe (226) is connected to the bottom of the oil supply pipeline (214) via a one-way check valve (227).

4. The pressure test equipment for rubber seals according to claim 3, characterized in that: A movable sealing block (228) is slidably disposed inside the inner end of the oil return pipeline (221), a stop spring (229) is fixedly connected between one side of the movable sealing block (228) and the stop cap (222), and a stop block (2210) is fixedly connected inside the oil return pipeline (221).

5. The pressure test equipment for rubber seals according to claim 4, characterized in that: Male magnets (2211) are equidistantly mounted on one side of the movable sealing block (228), and female magnets (2212) are equidistantly mounted on one side of the stop block (2210), and the male magnets (2211) and the female magnets (2212) are attracted to each other.

6. The pressure test equipment for rubber seals according to claim 2, characterized in that: A limiting mechanism (3) is arranged outside the pressure test cylinder (211), and the limiting mechanism (3) comprises a rubber seal (311), a fixing cylinder (312), a limiting ring (313), and a limiting element (32); The outer surface of the rubber seal (311) is fixedly connected to the inner wall of the fixed cylinder (312), and the fixed cylinder (312) is sleeved on the outside of the pressure test cylinder (211). Limiting rings (313) are mounted on both sides of the rubber seal (311) in a matching manner. The inner circumference of the limiting ring (313) is provided with release grooves at equal intervals, and a snap-off body is integrally formed and matched with the inner side of the rubber seal (311). Positioning holes are provided on both sides of the circumference of the rubber seal (311) at equal intervals. A plurality of limiting elements (32) are provided and are arranged on the outer side of the limiting ring (313) at equal intervals.

7. The pressure test equipment for rubber seals according to claim 6, characterized in that: The limiting element (32) comprises the following structure: A connecting block (321) is fixedly mounted on the outside of the limiting ring (313); A recess (322) integrally mounted on the top of the connecting block (321); A fixed palm (3210) is arranged on the front side of the connecting block (321); A fixed shaft (3212) is fixedly mounted on the surface of the connection block (321), and a convex ring (3211) is fixedly mounted via the fixed shaft (3212), and the convex ring (3211) is integrally mounted on the fixed palm (3210), and a foot groove that engages with the buckle foot (328) is provided on the top of the fixed palm (3210).

8. The pressure test equipment for rubber seals according to claim 7, characterized in that: The recess (322) is provided with a relaxation hole on both sides, and a toggle rod (323) is built into the relaxation hole, one end of the toggle rod (323) is fixedly connected to a sliding block (324), an outer wall of the toggle rod (323) is sleeved with a compression spring (325), one end of the compression spring (325) is fixedly connected to one side of the sliding block (324), and the other end of the compression spring (325) is fixedly connected to the inner side of the recess (322), a connecting hole matching the positioning hole is provided in the sliding block (324), and a positioning rod (326) matching the positioning hole is built into the connecting hole; A locking shaft (327) is movably connected to the surface of the recess (322); a buckle foot (328) is integrally connected to the other end of the locking shaft (327); a top outer wall of the locking shaft (327) is in sliding contact with the sliding block (324); an elastic U-shaped clip (329) is provided between the bottom of the locking shaft (327) and the connecting block (321); and the elastic U-shaped clip (329) is movably connected to the surface of the recess (322).

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