Hydraulic unit assembly sealing detection device and leakage detection method

Abstract

The present invention relates to a hydraulic unit assembly sealing detection device, comprising a base, a leakage meter, a moving block, a tooling seat, a pressure sensor, a power mechanism and an opening and closing mechanism, wherein the moving block is slidably connected to the base, the tooling seat is connected to a hydraulic unit to be tested, the hydraulic unit is connected to a first solenoid valve and a second solenoid valve, the hydraulic unit is provided with an air inlet channel, an air outlet channel and an internal channel, the moving block is provided with a first channel and a second channel, one end of the first channel is connected to the leakage meter, and one end of the second channel is connected to the pressure sensor; the invention also relates to a leakage detection method, which connects the first channel to the air inlet channel and the second channel to the air outlet channel, continuously changes the on-off state of the first solenoid valve and the second solenoid valve, compares the pressure value of the pressure sensor with an ideal value, and judges whether the hydraulic unit is qualified; so as to solve the technical problem in the prior art that unqualified hydraulic units flow into the market, which affects the use of products and even causes damage to people and property.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic unit sealing detection, and in particular to a hydraulic unit assembly sealing detection device and a leakage detection method. Background Art

[0002] A hydraulic unit is a hydraulic component used in hydraulic elements to control the on / off of each circuit. Common hydraulic units generally include an input pipe for the oil supply, an output pipe for the oil supply, and other internal pipes, and the on / off between each pipe is controlled by a solenoid valve. For example, Chinese patent CN217462449U discloses a pneumatic booster pump hydraulic unit, and Chinese patent CN215109779U discloses a hydraulic unit for controlling a car tailgate. These patents all disclose different hydraulic units, and the specific structures of the hydraulic units will also vary depending on the usage scenario. Hydraulic units generally use a riveting process when assembled, so it is necessary to confirm whether the product has defects and whether there are leaks before it goes offline. If unqualified hydraulic units flow into the market, it will affect the use of the product, and in serious cases, it will cause damage to people and property. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the first purpose of the present invention is to provide a hydraulic unit assembly sealing detection device to solve the technical problem in the existing technology that unqualified hydraulic units flow into the market, affecting product use and even causing personal and property damage.

[0004] In order to solve the above technical problems, the present invention provides a hydraulic unit assembly sealing detection device, including a base, a leakage meter, a moving block, a tooling seat, a pressure sensor, a power mechanism and an opening and closing mechanism. The moving block is slidably connected to the base and driven by the power mechanism. The leakage meter, the pressure sensor and the tooling seat are all connected to the base. The tooling seat is connected to the hydraulic unit to be tested, and the hydraulic unit is connected to a first solenoid valve and a second solenoid valve. The hydraulic unit is provided with an air inlet channel, an air outlet channel and an internal channel. The first solenoid valve is used to control the on-off between the air inlet channel and the air outlet channel, and the second solenoid valve is used to control the on-off between the air inlet channel and the internal channel. The moving block is provided with a first channel and a second channel. One end of the first channel is connected to the leakage meter, and one end of the second channel is connected to the pressure sensor. When the power mechanism drives the moving block to stick to the hydraulic unit, the first channel is connected to the air inlet channel, and the second channel is connected to the air outlet channel. The opening and closing mechanism is used to change the opening and closing state of the first solenoid valve and the second solenoid valve.

[0005] After adopting the above structure, a hydraulic unit assembly sealing detection device in the present invention has the following advantages: the on-off between the air inlet channel and the air outlet channel, and between the air inlet channel and the internal channel are controlled by the first solenoid valve and the second solenoid valve, and the opening and closing mechanism changes the opening and closing state of the first solenoid valve and the second solenoid valve under different detection conditions, and the hydraulic unit is supplied with air through the leakage meter, and the movable block serves as a medium between the hydraulic unit and the leakage meter and the pressure sensor. If the on-off condition and the sealing state of the first solenoid valve and the second solenoid valve are normal, the pressure sensor can detect a pressure value that meets the requirements, and the hydraulic unit is qualified. If the on-off condition or the sealing state of the first solenoid valve and the second solenoid valve are abnormal, the pressure value detected by the pressure sensor is greatly different from the ideal value, the hydraulic unit is unqualified and is scrapped. In this way, unqualified hydraulic units can be prevented from entering the market, and unqualified hydraulic units can be prevented from affecting product use and causing personal and property losses.

[0006] As an improvement, the first solenoid valve and the second solenoid valve are both connected to the upper end face of the hydraulic unit, and the opening and closing mechanism includes a first driving cylinder, a first mounting seat, a connecting plate, an opening and closing block and several coils. The first mounting seat is connected to the base, the first driving cylinder is connected to the top of the first mounting seat and the piston rod of the first driving cylinder is set downward, the piston rod of the first driving cylinder is connected to the connecting plate, the bottom surface of the connecting plate is connected to the opening and closing block, and the bottom surface of the opening and closing block is connected to several mounting holes, each mounting hole is located directly above the first solenoid valve or the second solenoid valve, and each mounting hole is connected to a coil. The first driving cylinder drives the opening and closing block to descend, so that the first solenoid valve and the second solenoid valve respectively enter one of the mounting holes and are electrically connected to the coil; with this structure, the coil is electrically connected to the first solenoid valve and the second solenoid valve, and the opening and closing states of the first solenoid valve and the second solenoid valve can be changed by turning the coil on and off, which is simple to operate and easy to use.

[0007] As an improvement, the opening and closing mechanism also includes a number of guide blocks and a number of guide rods, wherein the guide blocks are vertically connected to the top of the first mounting seat, each guide rod is slidably connected to one of the guide blocks, and a connecting plate is connected to the lower end of each guide rod; with this structure, the guide blocks and guide rods guide the movement of the connecting plate and the opening and closing block, ensuring that the first solenoid valve and the second solenoid valve can enter the mounting hole.

[0008] As an improvement, the power mechanism includes a second driving cylinder and a second mounting seat, the second mounting seat is connected to the base, the second driving cylinder is connected to the second mounting seat, the second driving cylinder piston rod is connected to the moving block, the base is connected to a guide rail, the bottom surface of the moving block is connected to a slider, and the slider is slidably connected to the guide rail; with this structure, the slider and the guide rail play a guiding role, making the movement of the moving block more stable, ensuring that the moving block is accurately attached to the hydraulic unit.

[0009] As an improvement, a third mounting seat is connected to the base, and a through hole and a through slot are provided on the third mounting seat. Both the through hole and the through slot vertically penetrate the third mounting seat. One end of the through slot is connected to the through hole, and the other end penetrates the third mounting seat. The pressure sensor is connected in the through hole, and a fixing bolt is connected to the third mounting seat. The fixing bolt passes through the through slot and is threadedly connected to the third mounting seat. With this structure, the through slot is tightened by the fixing bolt, thereby reducing the diameter of the through hole and fixing the pressure sensor.

[0010] As an improvement, the air inlet channel forms a first opening on the left end face of the hydraulic unit, the air outlet channel forms a second opening on the left end face of the hydraulic unit, one end of the first channel passes through the upper end face of the moving block and is connected to a first joint, the first channel is connected to the leakage meter through the first joint, the other end of the first channel forms a third opening on the right end face of the moving block, one end of the second channel passes through the upper end face of the moving block and is connected to a second joint, the second channel is connected to the pressure sensor through the second joint, the other end of the second channel forms a fourth opening on the right end face of the moving block, the first opening is coaxially arranged with the third opening, and the second opening is coaxially arranged with the fourth opening. When the power mechanism drives the right end face of the moving block to stick to the left end face of the hydraulic unit, the first opening is connected to the third opening, and the second opening is connected to the fourth opening.

[0011] A second object of the present invention is to provide a leakage detection method, which uses the above-mentioned hydraulic unit to assemble a sealing detection device. In the initial state, the first solenoid valve is normally open and the second solenoid valve is normally closed, comprising the following steps:

[0012] S1. The power mechanism drives the moving block to contact the hydraulic unit, so that the first channel connects to the air inlet channel and the second channel connects to the air outlet channel. The opening and closing mechanism controls the first solenoid valve to close, and the leak detector outputs pressurized gas, which enters the air inlet channel through the first channel. After time T1, if the pressure sensor detects a pressure value less than N1, the test passes.

[0013] S2. The first solenoid valve is opened by the opening and closing mechanism. The pressurized gas enters the pressure sensor through the air inlet and outlet channels in sequence. After time T2, if the pressure sensor detects a pressure value greater than N2, the test is qualified.

[0014] S3. The opening and closing mechanism controls the first solenoid valve to close and the second solenoid valve to open. Pressurized gas enters the internal channel through the intake channel. After time T3, if the pressure sensor detects a pressure value less than N3, the test is qualified.

[0015] S4. The opening and closing mechanism controls the first solenoid valve to open and the second solenoid valve to close. The pressurized gas enters the pressure sensor through the air inlet and outlet channels in sequence. After time T4, if the pressure sensor detects a pressure value between N4 and N5, the test is qualified.

[0016] S5. The first solenoid valve and the second solenoid valve are controlled to be in the initial state through the opening and closing mechanism. The pressurized gas enters the pressure sensor through the air inlet channel and the air outlet channel in sequence. After the pressure stabilization time T5, the test time T6 is started. If the leakage rate tested by the leak meter is less than t within the test time, the test is qualified.

[0017] After adopting the above structure, a leakage detection method in the present invention has the following advantages: step S1 is used to test the overall sealing when the first solenoid valve and the second solenoid valve are both closed, step S2 is used to test whether the flow state after the first solenoid valve is actuated is normal, step S3 is used to test the sealing after the first solenoid valve is actuated and whether the second solenoid valve is actuated is normal, step S4 is used to test the sealing after the second solenoid valve is actuated, and S5 is used to detect leakage in the initial state. Through various steps, external leakage of the hydraulic unit caused by poor riveting process and poor parts can be tested, and the total leakage after the solenoid valve action and the internal leakage of multiple parts are superimposed can also be detected, thereby enhancing the quality control of hydraulic units entering the market, avoiding affecting the use of related products, and avoiding causing damage to personnel and property. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure in embodiment 1 of the present invention.

[0019] Figure 2 This is a structural diagram of the moving block and the hydraulic unit in the first embodiment of the present invention.

[0020] Figure 3 This is a schematic structural diagram of the starting block and hydraulic unit in Example 1 of the present invention.

[0021] Figure markings: 100, hydraulic unit; 101, first solenoid valve; 102, second solenoid valve; 103, air inlet channel; 104, air outlet channel; 105, internal channel; 1, base; 2, leakage meter; 3, moving block; 4, tooling seat; 5, pressure sensor; 6, power mechanism; 61, second driving cylinder; 62, second mounting seat; 7, opening and closing mechanism; 71, first driving cylinder; 72, first mounting seat; 73, connecting plate; 74, opening and closing block; 75, coil; 76, guide block; 77, guide rod; 8, first channel; 9, second channel; 10, mounting hole; 11, guide rail; 12, slider; 13, third mounting seat; 14, through hole; 15, through groove; 16, first opening; 17, second opening; 18, first joint; 19, third opening; 20, second joint; 21, fourth opening. DETAILED DESCRIPTION

[0022] The following is a detailed description of a hydraulic unit assembly sealing detection device and a leakage detection method according to the present invention with reference to the accompanying drawings.

[0023] Example 1:

[0024] like Figures 1 to 3 As shown, in this embodiment, a hydraulic unit assembly sealing detection device is provided, including a base 1, a leakage meter 2, a moving block 3, a tooling seat 4, a pressure sensor 5, a power mechanism 6 and an opening and closing mechanism 7. The moving block 3 is slidably connected to the base 1 and driven by the power mechanism 6. The power mechanism 6 drives the moving block 3 to slide left and right. The leakage meter 2, the pressure sensor 5 and the tooling seat 4 are all connected to the base 1. The tooling seat 4 is connected to the hydraulic unit 100 to be tested, and the tooling seat 4 is located on the right side of the moving block 3, and the hydraulic unit 100 is fixed to the tooling seat 4 by bolts; the power mechanism 6 includes a second driving cylinder 61 and a second mounting seat 62, the second mounting seat 62 is connected to the base 1, the second driving cylinder 61 is connected to the second mounting seat 62, the piston rod of the second driving cylinder 61 is set to the right, and the piston rod of the second driving cylinder 61 is connected to the moving block 3, the base 1 is connected to left and right guide rails 11, the bottom surface of the moving block 3 is connected to a slider 12, and the slider 12 is slidably connected to the guide rail 11.

[0025] like Figure 1 and Figure 2 As shown, a first channel 8 and a second channel 9 are provided on the moving block 3, one end of the first channel 8 is connected to the leakage meter 2, and one end of the second channel 9 is connected to the pressure sensor 5; specifically, one end of the first channel 8 passes through the upper end surface of the moving block 3 and is connected to a first joint 18, the first channel 8 is connected to the leakage meter 2 through the first joint 18, the first joint 18 can be connected to an air pipe to be connected to the leakage meter 2, and the other end of the first channel 8 forms a third opening 19 on the right end surface of the moving block 3. In this embodiment, the first channel 8 is L-shaped, so one end of the first channel 8 is its upper end, and the other end of the first channel 8 is its right end; one end of the second channel 9 passes through the upper end surface of the moving block 3 and is connected to a second joint 20, the second channel 9 is connected to the pressure sensor 5 through the second joint 20, the second joint 20 can be connected to the pressure sensor 5 through the air pipe, and the other end of the second channel 9 forms a fourth opening 21 on the right end surface of the moving block 3. In this embodiment, the second channel 9 is L-shaped, so one end of the second channel 9 is its upper end, and the other end of the second channel 9 is its right end.

[0026] like Figure 2As shown, the hydraulic unit 100 is connected to a first solenoid valve 101 and a second solenoid valve 102, and is provided with an air intake channel 103, an air outlet channel 104 and an internal channel 105. The air intake channel 103 is connected to the air outlet channel 104 and the internal channel 105 respectively, and the first solenoid valve 101 is used to control the on-off between the air intake channel 103 and the air outlet channel 104, and the second solenoid valve 102 is used to control the on-off between the air intake channel 103 and the internal channel 105, wherein the air intake channel 103 forms a first opening 16 on the left end face of the hydraulic unit 100, and the air outlet channel 104 forms a second opening 17 on the left end face of the hydraulic unit 100. The specific structure of the hydraulic unit 100 is the existing technology and will not be repeated here. When the power mechanism 6 drives the moving block 3 to stick to the hydraulic unit 100, the first channel 8 is connected to the air inlet channel 103, and the second channel 9 is connected to the air outlet channel 104. In other words, the first opening 16 is coaxially arranged with the third opening 19, and the second opening 17 is coaxially arranged with the fourth opening 21. When the power mechanism 6 drives the right end face of the moving block 3 to stick to the left end face of the hydraulic unit 100, the first opening 16 is connected to the third opening 19, and the second opening 17 is connected to the fourth opening 21.

[0027] like Figure 1 and Figure 3As shown, the first solenoid valve 101 and the second solenoid valve 102 are both connected to the upper end surface of the hydraulic unit 100, and the opening and closing mechanism 7 is used to change the opening and closing state of the first solenoid valve 101 and the second solenoid valve 102. The opening and closing mechanism 7 includes a first driving cylinder 71, a first mounting seat 72, a connecting plate 73, an opening and closing block 74, a plurality of coils 75, a plurality of guide blocks 76 and a plurality of guide rods 77. The first mounting seat 72 is connected to the base 1, that is, the first mounting seat 72 is mounted on the base 1, the first driving cylinder 71 is connected to the top of the first mounting seat 72 and the piston rod of the first driving cylinder 71 is set downward, the piston rod of the first driving cylinder 71 is connected to the connecting plate 73, and the opening and closing block 74 is connected to the bottom surface of the connecting plate 73. A plurality of guide blocks 76 are vertically connected to the top of the first mounting seat 72, and each guide rod 77 is slidably connected to one of the guide blocks 76. The guide rods 77 are also vertically arranged, and the connecting plate 73 is connected to the lower end of each guide rod 77. In this embodiment, the guide There are two rods 77 and two guide blocks 76; a plurality of mounting holes 10 are connected to the bottom surface of the opening and closing block 74, and each mounting hole 10 is located directly above the first solenoid valve 101 or the second solenoid valve 102, that is, each mounting hole 10 is coaxially arranged with a first solenoid valve 101 or a second solenoid valve 102, and the mounting holes 10 correspond one-to-one to the first solenoid valve 101 and the second solenoid valve 102. A coil 75 is connected in each mounting hole 10, and the first driving cylinder 71 drives the opening and closing block 74 to descend, so that the first solenoid valve 101 and the second solenoid valve 102 respectively enter one of the mounting holes 10 and are electrically connected to the coil 75; in this embodiment, there are two first solenoid valves 101 and the second solenoid valve 102 respectively, and correspondingly, there are two air inlet channels 103, two air outlet channels 104, and two internal channels 105, two first channels 8, two second channels 9, two leakage meters 2 and two pressure sensors 5, and a total of four coils 75.

[0028] like Figure 1 As shown, the base 1 is connected to a third mounting base 13, and a through hole 14 and a through slot 15 are provided on the third mounting base 13. The through hole 14 and the through slot 15 both vertically penetrate the third mounting base 13, and the through slot 15 extends in the horizontal direction. One end of the through slot 15 is connected to the through hole 14, and the other end penetrates the third mounting base 13. The pressure sensor 5 is connected in the through hole 14, and a fixing bolt is connected to the third mounting base 13. The fixing bolt passes through the through slot 15 and is threadedly connected to the third mounting base 13.

[0029] The first solenoid valve 101 and the second solenoid valve 102 control the on / off between the air inlet channel 103 and the air outlet channel 104, and between the air inlet channel 103 and the internal channel 105, and the on / off state of the first solenoid valve 101 and the second solenoid valve 102 is changed by the on / off mechanism 7 under different detection conditions. The hydraulic unit 100 is supplied with air through the leak meter 2, and the movable block 3 serves as a medium between the hydraulic unit 100, the leak meter 2, and the pressure sensor 5. If the on / off state and the sealing state of the first solenoid valve 101 and the second solenoid valve 102 are normal, the pressure sensor 5 can detect a pressure value that meets the requirements, and the hydraulic unit 100 is qualified. If the on / off state or the sealing state of the first solenoid valve 101 and the second solenoid valve 102 are abnormal, the pressure value detected by the pressure sensor 5 is significantly different from the ideal value, and the hydraulic unit 100 is unqualified and scrapped. In this way, unqualified hydraulic units 100 can be prevented from entering the market, affecting product use, and causing personal and property losses.

[0030] Example 2:

[0031] This embodiment provides a leakage detection method, which uses a hydraulic unit assembly sealing detection device in the first embodiment. In the initial state, the first solenoid valve 101 is normally open and the second solenoid valve 102 is normally closed, including the following steps:

[0032] S1: The power mechanism 6 drives the moving block 3 to contact the hydraulic unit 100, so that the first channel 8 is connected to the air inlet channel 103 and the second channel 9 is connected to the air outlet channel 104. The opening and closing mechanism 7 controls the first solenoid valve 101 to close, and the leak detector 2 outputs pressurized gas, which enters the air inlet channel 103 through the first channel 8. After time T1, if the pressure sensor 5 detects a pressure value less than N1, the test is qualified.

[0033] S2. The first solenoid valve 101 is opened by the opening and closing mechanism 7. The pressurized gas enters the pressure sensor 5 through the air inlet channel 103 and the air outlet channel 104 in sequence. After time T2, if the pressure sensor 5 detects a pressure value greater than N2, the test is qualified.

[0034] S3. The opening and closing mechanism 7 controls the first solenoid valve 101 to close and the second solenoid valve 102 to open. The pressurized gas enters the internal channel 105 through the intake channel 103. After time T3, if the pressure sensor 5 detects a pressure value less than N3, the test is qualified.

[0035] S4. The opening and closing mechanism 7 controls the first solenoid valve 101 to open and the second solenoid valve 102 to close. The pressurized gas enters the pressure sensor 5 through the air inlet channel 103 and the air outlet channel 104 in sequence. After time T4, if the pressure sensor 5 detects a pressure value between N4 and N5, the test is qualified.

[0036] S5. The first solenoid valve 101 and the second solenoid valve 102 are controlled to be in the initial state through the opening and closing mechanism 7. The pressurized gas enters the pressure sensor 5 through the air inlet channel 103 and the air outlet channel 104 in sequence. After the pressure stabilization time T5, the test time T6 is started. If the leakage rate tested by the leak meter 2 is less than t within the test time, the test is qualified.

[0037] Among them, in steps S1 to S5, T1, T2, T3, T4 and T6 are all three seconds, T5 is five seconds, N1 and N3 are both 20psi, N2 is 70psi, N4 is 65psi, N5 is 75psi, and t is 1.5sccm. Step S1 is used to test the overall sealing when the first solenoid valve 101 and the second solenoid valve 102 are both closed. Step S2 is used to test whether the flow state after the first solenoid valve 101 is actuated is normal. Step S3 is used to test the sealing after the first solenoid valve 101 is actuated and whether the second solenoid valve 102 is actuated is normal. Step S4 is used to test the sealing after the second solenoid valve 102 is actuated. S5 is used to detect leakage in the initial state. Through various steps, external leakage of the hydraulic unit 100 caused by poor riveting process and poor parts can be tested. The total leakage after the solenoid valve action and the internal leakage of multiple parts can also be detected, thereby enhancing the quality control of the hydraulic unit 100 entering the market, avoiding affecting the use of related products, and avoiding causing damage to personnel and property.

[0038] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above two embodiments. All other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A hydraulic unit assembly sealing detection device, characterized in that: The invention comprises a base (1), a leakage meter (2), a moving block (3), a tooling seat (4), a pressure sensor (5), a power mechanism (6) and an opening and closing mechanism (7), wherein the moving block (3) is slidably connected to the base (1) and driven by the power mechanism (6), the leakage meter (2), the pressure sensor (5) and the tooling seat (4) are all connected to the base (1), the tooling seat (4) is connected to a hydraulic unit (100) to be tested, the hydraulic unit (100) is connected to a first solenoid valve (101) and a second solenoid valve (102), the hydraulic unit (100) is provided with an air inlet channel (103), an air outlet channel (104) and an internal channel (105), the first solenoid valve (101) is used to control the air inlet channel (103) and the second solenoid valve (102). ) and the air outlet channel (104), the second solenoid valve (102) is used to control the on-off between the air inlet channel (103) and the internal channel (105), the moving block (3) is provided with a first channel (8) and a second channel (9), one end of the first channel (8) is connected to the leakage meter (2), and one end of the second channel (9) is connected to the pressure sensor (5), when the power mechanism (6) drives the moving block (3) to stick to the hydraulic unit (100), the first channel (8) is connected to the air inlet channel (103), and the second channel (9) is connected to the air outlet channel (104), and the opening and closing mechanism (7) is used to change the opening and closing state of the first solenoid valve (101) and the second solenoid valve (102); The first solenoid valve (101) and the second solenoid valve (102) are both connected to the upper end surface of the hydraulic unit (100), the opening and closing mechanism (7) comprises a first driving cylinder (71), a first mounting seat (72), a connecting plate (73), an opening and closing block (74) and a plurality of coils (75), the first mounting seat (72) is connected to the base (1), the first driving cylinder (71) is connected to the top of the first mounting seat (72) and the piston rod of the first driving cylinder (71) is set downward, the piston rod of the first driving cylinder (71) is connected to the connecting plate (73), and the The bottom surface of the connecting plate (73) is connected to the opening and closing block (74), and the bottom surface of the opening and closing block (74) is connected to a plurality of mounting holes (10), each of the mounting holes (10) is located directly above the first solenoid valve (101) or the second solenoid valve (102), and each of the mounting holes (10) is connected to the coil (75). The first driving cylinder (71) drives the opening and closing block (74) to descend, so that the first solenoid valve (101) and the second solenoid valve (102) respectively enter one of the mounting holes (10) and are electrically connected to the coil (75). The air inlet channel (103) forms a first opening (16) on the left end surface of the hydraulic unit (100), and the air outlet channel (104) forms a second opening (17) on the left end surface of the hydraulic unit (100). One end of the first channel (8) passes through the upper end surface of the moving block (3) and is connected to a first joint (18). The first channel (8) is connected to the leakage meter (2) through the first joint (18). The other end of the first channel (8) forms a third opening (19) on the right end surface of the moving block (3). One end of the second channel (9) passes through the upper end surface of the moving block (3) and is connected to a second joint ( 20), the second channel (9) is connected to the pressure sensor (5) through the second connector (20), the other end of the second channel (9) forms a fourth opening (21) on the right end face of the moving block (3), the first opening (16) is coaxially arranged with the third opening (19), and the second opening (17) is coaxially arranged with the fourth opening (21), and when the power mechanism (6) drives the right end face of the moving block (3) to contact the left end face of the hydraulic unit (100), the first opening (16) is connected to the third opening (19), and the second opening (17) is connected to the fourth opening (21).

2. A hydraulic unit assembly sealing detection device according to claim 1, characterized in that: The opening and closing mechanism (7) further comprises a plurality of guide blocks (76) and a plurality of guide rods (77), wherein the plurality of guide blocks (76) are vertically connected to the top of the first mounting seat (72), each of the guide rods (77) is slidably connected to one of the guide blocks (76), and the connecting plate (73) is connected to the lower end of each guide rod (77).

3. The hydraulic unit assembly sealing detection device according to claim 1, characterized in that: The power mechanism (6) comprises a second driving cylinder (61) and a second mounting seat (62), wherein the second mounting seat (62) is connected to the base (1), the second driving cylinder (61) is connected to the second mounting seat (62), the piston rod of the second driving cylinder (61) is connected to the moving block (3), the base (1) is connected to a guide rail (11), the bottom surface of the moving block (3) is connected to a slider (12), and the slider (12) is slidably connected to the guide rail (11).

4. The hydraulic unit assembly sealing detection device according to claim 1, characterized in that: The base (1) is connected to a third mounting seat (13), and the third mounting seat (13) is provided with a through hole (14) and a through slot (15), and the through hole (14) and the through slot (15) both vertically penetrate the third mounting seat (13), one end of the through slot (15) is connected to the through hole (14), and the other end penetrates the third mounting seat (13), the pressure sensor (5) is connected in the through hole (14), and the third mounting seat (13) is connected with a fixing bolt, which passes through the through slot (15) and is threadedly connected to the third mounting seat (13).

5. A leakage detection method, characterized in that: A sealing detection device for assembling a hydraulic unit according to any one of claims 1 to 4 is used, wherein in an initial state, the first solenoid valve (101) is normally open and the second solenoid valve (102) is normally closed, and the device comprises the following steps: S1, the power mechanism (6) drives the moving block (3) to contact the hydraulic unit (100), so that the first channel (8) is connected to the air inlet channel (103), and the second channel (9) is connected to the air outlet channel (104), and the first solenoid valve (101) is controlled to be closed by the opening and closing mechanism (7), and the leak meter (2) outputs pressurized gas, and the pressurized gas enters the air inlet channel (103) through the first channel (8). After time T1, if the pressure sensor (5) detects a pressure value less than N1, the test is qualified; S2, the first solenoid valve (101) is controlled to open by the opening and closing mechanism (7), and the pressurized gas enters the pressure sensor (5) after passing through the air inlet channel (103) and the air outlet channel (104). After a time T2, if the pressure sensor (5) detects a pressure value greater than N2, the test is qualified; S3, the first solenoid valve (101) is closed and the second solenoid valve (102) is opened by controlling the opening and closing mechanism (7), and the pressurized gas enters the internal channel (105) through the air inlet channel (103). After a time T3, if the pressure value detected by the pressure sensor (5) is less than N3, the test is qualified; S4, the first solenoid valve (101) is controlled to open and the second solenoid valve (102) is controlled to close by the opening and closing mechanism (7), and the pressurized gas enters the pressure sensor (5) after passing through the air inlet channel (103) and the air outlet channel (104) in sequence. After a time T4, if the pressure sensor (5) detects a pressure value between N4 and N5, the test is qualified; S5. The first solenoid valve (101) and the second solenoid valve (102) are controlled to be in an initial state by the opening and closing mechanism (7). The pressurized gas enters the pressure sensor (5) through the air inlet channel (103) and the air outlet channel (104) in sequence. After the pressure stabilization time T5, the test time T6 is performed. If the leakage rate tested by the leak meter (2) is less than t during the test time, the test is qualified.

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