Rapid clamping device for hydraulic test of electromagnetic directional valve group and use method of rapid clamping device

Abstract

The invention discloses a rapid clamping device for a hydraulic test of an electromagnetic directional valve group and a use method thereof, and the device comprises a cylinder I, a cylinder II, a tool pedestal, 2n guide rail supports, a cylinder piston rod I, a cylinder piston rod II, n circular guide rails, a left pull rod, a right pull rod, a tested piece A port fixing oil way body, a tested piece B port fixing oil way body, and a tested piece P and T port fixing oil way body, the method comprises the following steps: 1) cleaning an orifice annular groove of a fixed oil way body; (2) the tested piece is tightly attached to the tested piece A opening fixing oil way body and the tested piece P and T opening fixing oil way body; (3) pushing a port B of the tested piece to fix an oil way body, and pressing the tested piece; 4) pre-tightening nuts on the left pull rod and the right pull rod; 5) pushing the tested piece by using an air cylinder I to press the tested piece and the tested piece P and T port fixed oil path body; and 6) tightening the nuts on the left pull rod and the right pull rod to finish the clamping of the tested piece. The problem that the clamping efficiency is low due to the fact that a workpiece is connected with all oil ways of the test bed in a manual mode is solved.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic valve testing, and in particular to a quick clamping device for hydraulic testing of an electromagnetic reversing valve group and a use method thereof. Background Art

[0002] The electromagnetic reversing valve is an automatic basic component used to control fluids. It is an actuator and is used to adjust the direction, flow, speed and other parameters of the medium in industrial control systems or vehicle chassis hydraulic control systems. There is a closed cavity in the electromagnetic reversing valve, with through holes in different positions. Each hole is connected to a different oil circuit. There is a piston in the middle of the cavity and two electromagnets on both sides. When the magnet coil on that side is energized, it will be sucked to the other side. When it is not energized, it will automatically return to the middle position to cut off the oil circuit. The different oil drain ports are opened or closed by controlling the on and off of the electromagnet. The electromagnetic reversing valve is not limited to hydraulics and pneumatics. It is used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium. There are many types of electromagnetic reversing valves, and different electromagnetic reversing valves play a role in different positions of the control system.

[0003] The electromagnetic reversing valve group is composed of multiple electromagnetic reversing valves integrated into one through an oil collecting block assembly, which realizes the opening and closing control of multiple hydraulic actuators in the vehicle chassis hydraulic control system. The electromagnetic reversing valve group product will undergo a hydraulic test after assembly to check the strength of the equipment and whether there is any leakage. The traditional test clamping method is to manually connect each pipe joint, which has low clamping efficiency. Summary of the invention

[0004] The purpose of the invention is to provide a quick clamping device for hydraulic test of an electromagnetic reversing valve group and a use method thereof.

[0005] The technical solution adopted to achieve the purpose of the present invention is as follows: a quick clamping device for hydraulic testing of an electromagnetic reversing valve group, comprising: a cylinder I, a cylinder II, a tooling base, 2n guide rail supports, a cylinder piston rod I, a cylinder piston rod II, n circular guide rails, a left pull rod, a right pull rod, a fixed oil circuit body at the A port of the test piece, a fixed oil circuit body at the B port of the test piece, and fixed oil circuit bodies at the P and T ports of the test piece, wherein n is a positive integer.

[0006] The tooling base is provided with a guide rail support, a circular guide rail, a fixed oil circuit body of the A port of the test piece, a fixed oil circuit body of the B port of the test piece, and fixed oil circuit bodies of the P and T ports of the test piece.

[0007] The A-port fixed oil circuit body of the test piece and the B-port fixed oil circuit body of the test piece are arranged relatively at intervals, and together with the P-port and T-port fixed oil circuit bodies of the test piece, form a U-shaped encirclement.

[0008] The A-port fixed oil circuit body of the test piece is fixedly installed on one side of the tooling base.

[0009] The test piece P and the T-port fixed oil circuit body are fixedly mounted on a tooling base.

[0010] The B-port fixed oil circuit body of the test piece moves on the tooling base through a circular guide rail, and both sides of the circular guide rail are fixed on the tooling base through guide rail supports.

[0011] The B-port fixed oil circuit body of the test piece is fixedly mounted with a left pull rod and a right pull rod, and the A-port fixed oil circuit body of the test piece and the B-port fixed oil circuit body of the test piece are connected together through the left pull rod and the right pull rod.

[0012] The lengths of the left tie rod and the right tie rod are fixed by nuts, thereby fixing the distance between the A-port fixed oil circuit body of the test piece and the B-port fixed oil circuit body of the test piece.

[0013] A cylinder piston rod II is provided on one side of the test piece B port fixed oil circuit body away from the test piece A port fixed oil circuit body, and a cylinder II is provided on the other side of the cylinder piston rod II.

[0014] A cylinder piston rod I is provided at the opening of the U-shaped encirclement, and a cylinder I is provided on the other side of the cylinder piston rod I.

[0015] The U-shaped encirclement formed by the A-port fixed oil circuit body of the test piece, the B-port fixed oil circuit body of the test piece, and the P- and T-port fixed oil circuit bodies of the test piece is adapted to the test piece.

[0016] The test piece is placed in the U-shaped encirclement, and the test piece is pushed and pressed by cylinders I and II to achieve clamping of the test piece.

[0017] Furthermore, the holes on the A-port fixed oil circuit body of the test piece, the B-port fixed oil circuit body of the test piece, and the P- and T-port fixed oil circuit bodies of the test piece that are adapted to the test piece are connected to the oil circuit of the test bench.

[0018] Furthermore, the orifice end surfaces of the A-port fixed oil circuit body of the test piece, the B-port fixed oil circuit body of the test piece, and the P- and T-port fixed oil circuit bodies of the test piece that contact the test piece are provided with annular grooves.

[0019] Furthermore, an O-ring is provided in the annular groove.

[0020] The clamping method using the above device includes:

[0021] 1) Clean the annular grooves of the fixed oil circuit body of the A port of the test piece, the fixed oil circuit body of the B port of the test piece, and the fixed oil circuit body of the P and T ports of the test piece that are in contact with the test piece, and place O-rings.

[0022] 2) Place the test piece on the fixture base, and make sure that the test piece is in close contact with the A-port fixed oil circuit body, and the test piece is in close contact with the P-port fixed oil circuit body.

[0023] 3) Use cylinder II to push the B port of the test piece to fix the oil circuit body and press the test piece.

[0024] 4) Pre-tighten the nuts on the left and right tie rods to connect the fixed oil circuit body at port A of the test piece with the fixed oil circuit body at port B of the test piece.

[0025] 5) Use cylinder I to push the test piece so that the test piece and the test piece P and T port fixed oil circuit body are pressed tightly.

[0026] 6) Tighten the nuts on the left and right tie rods to complete the clamping of the test piece.

[0027] The technical effect of the present invention is unquestionable. The present invention solves the problem of low clamping efficiency caused by manually connecting the workpiece and the various oil circuits of the test bench, and realizes the one-time connection of all oil ports of the workpiece and the oil circuits of the test bench, effectively improving the test clamping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of a test clamping device for an electromagnetic reversing valve group;

[0029] Figure 2 This is a schematic diagram of the product structure of the electromagnetic reversing valve group; Figure 2 (a) is a side view of the solenoid reversing valve group product structure; Figure 2 (b) is the front view of the solenoid reversing valve group product structure;

[0030] Figure 3 This is the schematic diagram of the fixed oil circuit body at port A of the test piece; Figure 3 (a) is the front view of the fixed oil circuit body at port A of the test piece; Figure 3 (b) is the side view of the fixed oil circuit body at port A of the test piece; Figure 3 (c) is the cross-sectional view of the fixed oil circuit body at port A of the test piece;

[0031] Figure 4 It is the schematic diagram of the fixed oil circuit body of the P and T ports of the test piece; Figure 4 (a) is the front view of the P and T-port fixed oil circuit body of the test piece; Figure 4 (b) is a cross-sectional view of the fixed oil circuit body of the P and T ports of the test piece; Figure 4 (c) is the rear view of the fixed oil circuit body of the P and T ports of the test piece; Figure 4 (d) is a bottom view of the P and T ports of the test piece fixed with the oil circuit body; Figure 4 (e) is a top view of the test piece P and T port fixed oil circuit body;

[0032] Figure 5 This is the schematic diagram of the fixed oil circuit body at port B of the test piece; Figure 5 (a) is the front view of the fixed oil circuit body at port B of the test piece; Figure 5 (b) is the cross-sectional view of the fixed oil circuit body at port B of the test piece; Figure 5 (c) is the rear view of the fixed oil circuit body at port B of the test piece;

[0033] In the figure, cylinder I1, cylinder II2, tooling base 3, guide rail support 4, cylinder piston rod I5, cylinder piston rod II6, circular guide rail 7, left pull rod 8, right pull rod 9, test piece A port fixed oil circuit body 10, test piece B port fixed oil circuit body 11, test piece P and T port fixed oil circuit body 12, test piece 13. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the embodiments, but it should not be understood that the above subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various substitutions and changes are made according to the common technical knowledge and customary means in the art, which should all be included in the protection scope of the present invention.

[0035] Embodiment 1:

[0036] See also Figures 1 to 5 A quick clamping device for hydraulic testing of an electromagnetic reversing valve group comprises: a cylinder I1, a cylinder II2, a tooling base 3, 2n guide rail supports 4, a cylinder piston rod I5, a cylinder piston rod II6, n circular guide rails 7, a left pull rod 8, a right pull rod 9, a fixed oil circuit body 10 for the A port of the test piece, a fixed oil circuit body 11 for the B port of the test piece, and a fixed oil circuit body 12 for the P and T ports of the test piece, wherein n is a positive integer.

[0037] The tooling base 3 is provided with a guide rail support 4 , a circular guide rail 7 , a test piece A port fixed oil circuit body 10 , a test piece B port fixed oil circuit body 11 , and a test piece P and T port fixed oil circuit body 12 .

[0038] The A-port fixed oil circuit body 10 and the B-port fixed oil circuit body 11 of the test piece are arranged relatively at intervals, and together with the P-port fixed oil circuit body 12 of the test piece, form a U-shaped encirclement.

[0039] The test piece A port fixed oil circuit body 10 is fixedly installed on one side of the tooling base 3 .

[0040] The test piece P and the T-port fixed oil circuit body 12 are fixedly mounted on the tooling base 3 .

[0041] The B-port fixed oil circuit body 11 of the test piece moves on the tooling base 3 via the circular guide rail 7 , and both sides of the circular guide rail 7 are fixed on the tooling base 3 via the guide rail supports 4 .

[0042] The test piece B port fixed oil circuit body 11 is fixedly mounted with a left tie rod 8 and a right tie rod 9 , and the test piece A port fixed oil circuit body 10 and the test piece B port fixed oil circuit body 11 are connected together through the left tie rod 8 and the right tie rod 9 .

[0043] The lengths of the left tie rod 8 and the right tie rod 9 are fixed by nuts, thereby fixing the distance between the A-port fixed oil circuit body 10 and the B-port fixed oil circuit body 11 of the test piece.

[0044] The side of the test piece B-port fixed oil circuit body 11 away from the test piece A-port fixed oil circuit body 10 is provided with a cylinder piston rod II6, and the other side of the cylinder piston rod II6 is provided with a cylinder II2.

[0045] A cylinder piston rod I5 is provided at the opening of the U-shaped encirclement, and a cylinder I1 is provided on the other side of the cylinder piston rod I5.

[0046] The U-shaped encirclement formed by the A-port fixed oil circuit body 10 of the test piece, the B-port fixed oil circuit body 11 of the test piece, and the P- and T-port fixed oil circuit bodies 12 of the test piece is adapted to the test piece 13 .

[0047] The test piece 13 is placed in the U-shaped encirclement, and the test piece 13 is pushed and pressed by the cylinders I1 and II2 to achieve clamping of the test piece 13.

[0048] Embodiment 2:

[0049] A quick clamping device for hydraulic testing of an electromagnetic reversing valve group, the main technical content of which is shown in Example 1. Furthermore, the holes on the test piece A port fixed oil circuit body 10, the test piece B port fixed oil circuit body 11, the test piece P and T port fixed oil circuit bodies 12 that are adapted to the test piece 13 are connected to the test bench oil circuit.

[0050] Embodiment 3:

[0051] A quick clamping device for hydraulic testing of an electromagnetic reversing valve group, the main technical content of which is shown in any one of embodiments 1 to 2. Furthermore, the orifice end faces of the test piece A port fixed oil circuit body 10, the test piece B port fixed oil circuit body 11, the test piece P and T port fixed oil circuit bodies 12 that contact the test piece 13 are provided with annular grooves.

[0052] Embodiment 4:

[0053] A quick clamping device for hydraulic testing of an electromagnetic reversing valve group, the main technical content of which is shown in any one of embodiments 1 to 3, and further, an O-ring is provided in the annular groove.

[0054] Embodiment 5:

[0055] A clamping method using the device described in any one of embodiments 1 to 4 comprises:

[0056] 1) Clean the annular grooves of the fixed oil circuit body of the A port of the test piece, the fixed oil circuit body of the B port of the test piece, and the fixed oil circuit body of the P and T ports of the test piece that are in contact with the test piece, and place O-rings.

[0057] 2) Place the test piece on the fixture base, and make sure that the test piece is in close contact with the A-port fixed oil circuit body, and the test piece is in close contact with the P-port fixed oil circuit body.

[0058] 3) Use cylinder II to push the B port of the test piece to fix the oil circuit body and press the test piece.

[0059] 4) Pre-tighten the nuts on the left and right tie rods to connect the fixed oil circuit body at port A of the test piece with the fixed oil circuit body at port B of the test piece.

[0060] 5) Use cylinder I to push the test piece so that the test piece and the test piece P and T port fixed oil circuit body are pressed tightly.

[0061] 6) Tighten the nuts on the left and right tie rods to complete the clamping of the test piece.

[0062] Embodiment 6:

[0063] See also Figures 1 to 5 A quick clamping device for hydraulic testing of an electromagnetic reversing valve group includes: a cylinder I1, a cylinder II2, a tooling base 3, four guide rail supports 4, a cylinder piston rod I5, a cylinder piston rod II6, two round guide rails 7, a left pull rod 8, a right pull rod 9, a fixed oil circuit body 10 for the A port of the test piece, a fixed oil circuit body 11 for the B port of the test piece, and a fixed oil circuit body 12 for the P and T ports of the test piece.

[0064] The tooling base 3 is provided with a guide rail support 4 , a circular guide rail 7 , a test piece A port fixed oil circuit body 10 , a test piece B port fixed oil circuit body 11 , and a test piece P and T port fixed oil circuit body 12 .

[0065] The A-port fixed oil circuit body 10 and the B-port fixed oil circuit body 11 of the test piece are arranged relatively at intervals, and together with the P-port fixed oil circuit body 12 of the test piece, form a U-shaped encirclement.

[0066] The test piece A port fixed oil circuit body 10 is fixedly installed on one side of the tooling base 3 .

[0067] The test piece P and the T-port fixed oil circuit body 12 are fixedly mounted on the tooling base 3 .

[0068] The B-port fixed oil circuit body 11 of the test piece moves on the tooling base 3 via the circular guide rail 7 , and both sides of the circular guide rail 7 are fixed on the tooling base 3 via the guide rail supports 4 .

[0069] The test piece B port fixed oil circuit body 11 is fixedly mounted with a left tie rod 8 and a right tie rod 9 , and the test piece A port fixed oil circuit body 10 and the test piece B port fixed oil circuit body 11 are connected together through the left tie rod 8 and the right tie rod 9 .

[0070] The lengths of the left tie rod 8 and the right tie rod 9 are fixed by nuts, thereby fixing the distance between the A-port fixed oil circuit body 10 and the B-port fixed oil circuit body 11 of the test piece.

[0071] The side of the test piece B-port fixed oil circuit body 11 away from the test piece A-port fixed oil circuit body 10 is provided with a cylinder piston rod II6, and the other side of the cylinder piston rod II6 is provided with a cylinder II2.

[0072] A cylinder piston rod I5 is provided at the opening of the U-shaped encirclement, and a cylinder I1 is provided on the other side of the cylinder piston rod I5.

[0073] The U-shaped encirclement formed by the A-port fixed oil circuit body 10 of the test piece, the B-port fixed oil circuit body 11 of the test piece, and the P- and T-port fixed oil circuit bodies 12 of the test piece is adapted to the test piece 13 .

[0074] The input and output ports of the test piece are sealed by end face sealing. The test piece 13 is placed in the U-shaped encirclement, and the test piece 13 is pushed and pressed by cylinders I1 and II2 to achieve clamping of the test piece 13.

[0075] Embodiment 7:

[0076] A quick clamping device for hydraulic testing of an electromagnetic reversing valve group, the main technical content of which is shown in Example 6. Furthermore, the holes on the test piece A-port fixed oil circuit body 10, the test piece B-port fixed oil circuit body 11, and the test piece P and T-port fixed oil circuit bodies 12 that are adapted to the test piece 13 are connected to the test bench oil circuit.

[0077] Embodiment 8:

[0078] A quick clamping device for hydraulic testing of an electromagnetic reversing valve group, the main technical content of which is shown in any one of Examples 6 to 7. Furthermore, the orifice end faces of the test piece A port fixed oil circuit body 10, the test piece B port fixed oil circuit body 11, the test piece P and T port fixed oil circuit bodies 12 that contact the test piece 13 are provided with annular grooves.

[0079] Embodiment 9:

[0080] A quick clamping device for hydraulic testing of an electromagnetic reversing valve group, the main technical content of which is shown in any one of Embodiments 6 to 8, and further, an O-ring is provided in the annular groove.

[0081] Embodiment 10:

[0082] A clamping method using the device described in any one of Examples 6-9 comprises:

[0083] 1) Clean the annular grooves of the fixed oil circuit body of the A port of the test piece, the fixed oil circuit body of the B port of the test piece, and the fixed oil circuit body of the P and T ports of the test piece that are in contact with the test piece, and place O-rings.

[0084] 2) Place the test piece on the fixture base, and make sure that the test piece is in close contact with the A-port fixed oil circuit body, and the test piece is in close contact with the P-port fixed oil circuit body.

[0085] 3) Use cylinder II to push the B port of the test piece to fix the oil circuit body and press the test piece.

[0086] 4) Pre-tighten the nuts on the left and right tie rods to connect the fixed oil circuit body at port A of the test piece with the fixed oil circuit body at port B of the test piece.

[0087] 5) Use cylinder I to push the test piece so that the test piece and the test piece P and T port fixed oil circuit body are pressed tightly.

[0088] 6) Tighten the nuts on the left and right tie rods to complete the clamping of the test piece.

[0089] Embodiment 11:

[0090] See also Figures 1 to 5 , a quick clamping device for hydraulic test of electromagnetic reversing valve group and its use method, the main technical contents include:

[0091] The device is mainly composed of a cylinder, a fixed oil circuit body, a tooling base, etc. The holes on one side of each fixed oil circuit are connected to the oil circuits of the test bench. The openings of each hole on one side have end face annular grooves, and O-rings are placed in the grooves. The positions of the holes on this side match those of the holes on the workpiece one by one, and the sealing of the input and output ports of the test piece is achieved by using end face sealing. The workpiece is placed on the plane of the tooling base, and the cylinder is used to push one side of the workpiece and the fixed oil circuit body to press tightly to complete the clamping of the test piece.

[0092] Combination Figure 1 The specific process is as follows:

[0093] Step 1: Clean the sealing ring grooves of the pipeline holes on the A-port fixed oil circuit body of the test piece, the B-port fixed oil circuit body of the test piece, and the P and T-port fixed oil circuit bodies of the test piece, and place O-rings of corresponding specifications.

[0094] Step 2: Place the workpiece on the fixture base platform, and make it close to the A-port fixed oil circuit body of the test piece, and the P-port and T-port fixed oil circuit bodies of the test piece;

[0095] Step 3: Press the control button of cylinder II, and cylinder II pushes the fixed oil circuit body of port B of the test piece to press tightly against the workpiece;

[0096] Step 4: Connect the left tie rod and the right tie rod fixed on the B port fixed oil circuit body of the test piece to the A port fixed oil circuit body of the test piece, and pre-tighten the nuts on the tie rods;

[0097] Step 5: Press the control button of cylinder I, and cylinder I pushes the workpiece and the test piece P and T ports to fix the oil circuit body tightly;

[0098] Step 6: Tighten the nuts on the left and right tie rods to complete the test clamping of the workpiece.

Claims

1. A quick clamping device for hydraulic test of electromagnetic reversing valve group, characterized in that: include: Cylinder I (1), cylinder II (2), tooling base (3), 2n guide rail supports (4), cylinder piston rod I (5), cylinder piston rod II (6), n circular guide rails (7), left pull rod (8), right pull rod (9), A-port fixed oil circuit body (10) of the test piece, B-port fixed oil circuit body (11) of the test piece, and P and T-port fixed oil circuit bodies (12) of the test piece, wherein n is a positive integer. The tooling base (3) is provided with a guide rail support (4), a circular guide rail (7), a test piece A port fixed oil circuit body (10), a test piece B port fixed oil circuit body (11), and a test piece P and T port fixed oil circuit body (12); The A-port fixed oil circuit body (10) and the B-port fixed oil circuit body (11) of the test piece are arranged relatively spaced apart, and together with the P-port fixed oil circuit body (12) and the T-port fixed oil circuit body (12) of the test piece, form a U-shaped encirclement; The A-port fixed oil circuit body (10) of the test piece is fixedly mounted on one side of the tooling base (3); The test piece P and the T-port fixed oil circuit body (12) are fixedly mounted on the tooling base (3); The B-port fixed oil circuit body (11) of the test piece moves on the tooling base (3) via a circular guide rail (7), and both sides of the circular guide rail (7) are fixed on the tooling base (3) via guide rail supports (4); The test piece B-port fixed oil circuit body (11) is fixedly mounted with a left pull rod (8) and a right pull rod (9), and the test piece A-port fixed oil circuit body (10) and the test piece B-port fixed oil circuit body (11) are connected together via the left pull rod (8) and the right pull rod (9). The lengths of the left pull rod (8) and the right pull rod (9) are fixed by nuts, thereby fixing the distance between the A-port fixed oil circuit body (10) and the B-port fixed oil circuit body (11) of the test piece; A cylinder piston rod II (6) is provided on the side of the test piece B-port fixed oil circuit body (11) away from the test piece A-port fixed oil circuit body (10), and a cylinder II (2) is provided on the other side of the cylinder piston rod II (6); A cylinder piston rod I (5) is provided at the opening of the U-shaped encirclement, and a cylinder I (1) is provided on the other side of the cylinder piston rod I (5); The U-shaped encircling ring formed by the A-port fixed oil circuit body (10) of the test piece, the B-port fixed oil circuit body (11) of the test piece, and the P-port and T-port fixed oil circuit bodies (12) of the test piece is adapted to the test piece (13); The test piece (13) is placed in the U-shaped encircling ring, and the test piece (13) is pushed and pressed by the cylinder I (1) and the cylinder II (2) to achieve clamping of the test piece (13).

2. The electromagnetic reversing valve group hydraulic test quick clamping device according to claim 1 is characterized in that: The holes on the A-port fixed oil circuit body (10) of the test piece, the B-port fixed oil circuit body (11) of the test piece, and the P- and T-port fixed oil circuit bodies (12) of the test piece that are adapted to the test piece (13) are connected to the test bench oil circuit.

3. The electromagnetic reversing valve group hydraulic test quick clamping device according to claim 1 is characterized in that: The test piece A port fixed oil circuit body (10), the test piece B port fixed oil circuit body (11), the test piece P and T port fixed oil circuit bodies (12) and the test piece (13) are provided with annular grooves on their orifice end surfaces in contact with the test piece.

4. The electromagnetic reversing valve group hydraulic test quick clamping device according to claim 3 is characterized in that: An O-type sealing ring is arranged in the annular groove.

5. A clamping method using the device according to any one of claims 1 to 4, characterized in that: include: 1) Clean the annular grooves of the A-port fixed oil circuit body, the B-port fixed oil circuit body, the P-port and T-port fixed oil circuit bodies of the test piece that are in contact with the test piece, and place O-rings; 2) Place the test piece on the tooling base, and make sure that the test piece is in close contact with the A-port fixed oil circuit body, and the P-port fixed oil circuit body is in close contact with the T-port fixed oil circuit body; 3) Use cylinder II to push the fixed oil circuit body at port B of the test piece to press the test piece tightly; 4) Pre-tighten the nuts on the left and right tie rods to connect the fixed oil circuit body at port A of the test piece to the fixed oil circuit body at port B of the test piece; 5) Use cylinder I to push the test piece, so that the test piece and the test piece P and T port fixed oil circuit body are pressed tightly; 6) Tighten the nuts on the left and right tie rods to complete the clamping of the test piece.

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