A large lateral force rubber-coated piston friction testing machine

Abstract

The present application belongs to the technical field of piston friction force testing equipment, and particularly relates to a large lateral force rubber-coated piston friction force testing machine, which comprises a rack and a linear moving mechanism, the linear moving mechanism is fixed on the rack, a test groove is arranged on the rack, a counterweight hanger is arranged at the test groove, a mandrel is detachably connected to the counterweight hanger, a rubber-coated piston is fixed on the mandrel, the rubber-coated piston is located in the test groove and can move along the test groove; a counterweight block is connected to the lower end of the counterweight hanger; the linear moving mechanism is connected with the mandrel through a tension-compression sensor, and the linear moving mechanism pulls the traction sensor, the counterweight hanger, the mandrel and the rubber-coated piston thereon to move along the test groove. According to the force value signal of the tension-compression sensor and the displacement of the linear electric sliding table, a force value displacement curve is obtained, and the friction force value is outputted after the smooth section of the curve is selected through calculation; the test cost is relatively low, and a shock absorber needs not to be damaged for testing the large lateral force friction force value.

Description

Technical Field

[0001] This invention belongs to the technical field of piston friction force testing equipment, specifically relating to a large lateral force rubber-coated piston friction force testing machine. Background Technology

[0002] Currently, domestic shock absorber manufacturers use ZF's testing standards for piston friction testing. However, due to structural limitations of the shock absorber, the piston friction test data is inaccurate and unstable under large lateral forces.

[0003] like Figure 9 As shown, traditional piston lateral force testing standards, due to structural limitations, affect the test results of piston friction and cannot withstand large lateral forces, generally below 500N. Furthermore, the rubber-coated piston 6 is placed inside the shock absorber's working cylinder and immersed in oil, so it can only test the coefficient of friction in the oil (wet) state; at the same time, the testing cost is high, and testing large lateral force friction values ​​requires damaging a shock absorber. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a friction testing machine for rubber-coated pistons with high lateral force, which can perform friction tests without damaging the shock absorber.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A friction testing machine for a rubber-coated piston with large lateral force includes a frame and a linear movement mechanism. The linear movement mechanism is fixed on the frame. A test groove is provided on the frame, and a counterweight bracket is provided at the test groove. A mandrel is detachably connected to the counterweight bracket, and a rubber-coated piston is fixed on the mandrel. The upper end of the test groove is open, and the rubber-coated piston is located in the test groove and can move along the test groove. A counterweight block is connected to the lower end of the counterweight bracket. The linear movement mechanism is connected to the mandrel through a tension / compression sensor. The linear movement mechanism pulls the traction sensor, the counterweight bracket, the mandrel, and the rubber-coated piston on it to move along the test groove.

[0007] The linear motion mechanism uses a linear motor. The base of the linear motor is fixedly connected to the frame. One end of the tension-compression sensor is fixed to the moving part of the linear motor. The other end of the tension-compression sensor is connected to the spindle via a rope. The two ends of the rope are fixedly connected to the other end of the tension-compression sensor and the spindle, respectively.

[0008] It also includes a reset push rod, which is fixed on a linear motion mechanism and the end of the reset push rod can contact the mandrel; the reset push rod is driven to move by the linear motion mechanism, and the reset push rod pushes the counterweight bracket, the mandrel and the rubber-coated piston on it to move in the opposite direction along the test groove.

[0009] The half-cylinder track is fixed on the rack, and the two ends of the half-cylinder track are blocked to form a test groove.

[0010] The counterweight is located at the bottom of the rack, and the counterweight is connected with the counterweight hanger through a connecting rod.

[0011] The two sides of the counterweight hanger are detachably connected with the mandrel support, and the two ends of the mandrel are respectively inserted into the mandrel support.

[0012] One end of the mandrel is provided with a ring of protrusions, and a locking nut is threadedly connected to the mandrel, and the rubber-coated piston is located between the ring of protrusions and the locking nut.

[0013] Two mandrel gaskets are provided, and the two mandrel gaskets are sleeved on the mandrel and located on the two sides of the rubber-coated piston.

[0014] A gasket pin is provided, which can pass through the mandrel gasket on one side of the rubber-coated piston, the rubber-coated piston and the mandrel gasket on the other side of the rubber-coated piston in sequence.

[0015] One end of the mandrel is fixedly connected with a mandrel lifting ring, and the tension-compression sensor is connected with the mandrel lifting ring.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] The traction sensor, the counterweight hanger, the mandrel and the rubber-coated piston on the mandrel are pulled along the test groove by the linear movement mechanism, and the force displacement curve is obtained according to the force value signal of the tension-compression sensor and the displacement of the linear electric sliding table. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present application;

[0019] Figure 2 is Figure 1 is a partial enlarged view of A in

[0020] Figure 3 is a schematic diagram of the half-section structure of the present application;

[0021] Figure 4 is Figure 2 is a partial enlarged view of B in

[0022] Figure 5 is a structural schematic diagram of one direction of the counterweight hanger of the present application;

[0023] Figure 6 is a structural schematic diagram of another direction of the counterweight hanger of the present application;

[0024] Figure 7 is an exploded view of the connection of the mandrel and the rubber-coated piston of the present application;

[0025] Figure 8 is a circuit schematic diagram of the present application;

[0026] Figure 9 is a test schematic diagram of the prior art;

[0027] Wherein: 1 is a rack, 2 is a linear motion mechanism, 3 is a test slot, 4 is a counterweight hanger, 5 is a mandrel, 6 is a rubber-coated piston, 7 is a counterweight, 8 is a tension-compression sensor, 9 is a rope, 10 is a reset push rod, 11 is a semi-cylindrical track, 12 is a connecting rod, 13 is a slot, 14 is a mandrel support, 15 is a protrusion, 16 is a locking nut, 17 is a mandrel gasket, 18 is a gasket pin, and 19 is a mandrel lifting ring. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] As shown in Figures 1 to 7 A large lateral force rubber-coated piston friction test machine includes a rack 1 and a linear motion mechanism 2, the linear motion mechanism 2 is fixed on the rack 1, the rack 1 is provided with a test slot 3, the test slot 3 is provided with a counterweight hanger 4, the counterweight hanger 4 is detachably connected with a mandrel 5, a rubber-coated piston 6 is fixed on the mandrel 5, the test slot 3 is open at the upper end, and the rubber-coated piston 6 can be placed in the test slot 3 through the upper end opening and can move along the test slot 3.

[0030] The counterweight hanger 4 is connected with a counterweight 7 at the lower end; the side surface of the rubber-coated piston 6 is in close contact with the test slot 3, the counterweight hanger 4 is pulled downward through the counterweight 7, so that the rubber-coated piston 6 exerts a downward force on the test slot 3; at the same time, different weights of the counterweight 7 can be replaced according to needs.

[0031] The linear motion mechanism 2 is connected with the mandrel 5 through a tension-compression sensor 8, and the linear motion mechanism 2 pulls the traction sensor, the counterweight hanger 4, the mandrel 5 and the rubber-coated piston 6 on it to move along the test slot 3.

[0032] According to actual needs, it is confirmed whether oil needs to be added in the test groove 3; the test process is as follows: the weight hanger 4 is pushed to make the rubber-coated piston 6 located at one side of the test groove 3, then the traction sensor, the weight hanger 4, the mandrel 5 and the rubber-coated piston 6 thereon are pulled to move along the test groove 3 through the linear moving mechanism 2, and the rubber-coated piston 6 moves 100 mm; according to the force value signal of the tension and compression sensor and the displacement signal of the linear electric sliding table (which can be obtained through the controller), the force value displacement curve is obtained, the friction value is outputted by selecting the smooth section of the curve after calculation, the final result of the friction value is outputted after reciprocating three times, and then the mandrel support 14 at one side is disassembled to replace the next group of rubber-coated piston 6 test pieces.

[0033] Meanwhile, a corresponding industrial computer can also be arranged, and the industrial computer displays the above-mentioned force value displacement curve. As for the above-mentioned control circuit, it can be designed by those skilled in the art according to the needs, and can be designed by referring to the circuit arrangement in Figure 8 , and other adjustments and designs can also be made, so no detailed description is given here.

[0034] Further, the above-mentioned linear moving mechanism 2 can be realized by using a gas cylinder, an oil cylinder, an electric telescopic lever, a gear and rack moving mechanism or other linear moving mechanisms 2; as long as it can drive the rubber-coated piston 6 to move.

[0035] The linear moving mechanism 2 preferably adopts a linear motor (servo drive), the base of the linear motor is fixedly connected with the rack 1, one end of the tension and compression sensor 8 is fixed on the mover base of the linear motor, the other end of the tension and compression sensor 8 is connected with the mandrel 5 through the rope 9, and the two ends of the rope 9 are fixedly connected with the other end of the tension and compression sensor 8 and the mandrel 5 respectively; that is, the rubber-coated piston 6 is pulled to move through the rope 9. The above-mentioned rope 9 preferably adopts a steel wire cable.

[0036] Further, in the above-mentioned test, the rubber-coated piston 6 needs to be manually moved to one side for resetting, and then pulled to test after resetting, which has certain inconvenience in the test process. Therefore, the reset push rod 10 is further included, the reset push rod 10 is fixed on the linear moving mechanism 2, and the end of the reset push rod 10 can contact with the mandrel 5; the reset push rod 10 is reversely moved by the linear moving mechanism 2, so that the reset push rod 10 pushes the rubber-coated piston 6, the weight hanger 4 and the mandrel 5 thereon to reversely move along the test groove 3, and the rubber-coated piston 6 is reset to one side of the test groove 3. Through the above-mentioned structure, manual resetting and traction testing can be avoided.

[0037] Further, the above-mentioned test groove 3 can be directly realized by slotting 13 on the rack 1, or the following structure can also be used: that is, the semicylindrical track 11 is fixed on the rack 1, and the two ends of the semicylindrical track 11 are blocked to form the test groove 3.

[0038] Further, the counterweight 7 is located at the bottom of the frame 1, the counterweight 7 is connected with the counterweight hanger 4 through the connecting rod 12, the counterweight 7 is detachably connected with the connecting rod 12, the connecting rod 12 can be fixedly connected or hinged with the counterweight hanger 4 through the frame 1, the frame 1 is provided with a corresponding slot 13, the connecting rod 12 can move along the slot 13, and the movement of the rubber-coated piston 6 along the test groove 3 is not affected. Preferably, the connecting mode of hinging is adopted.

[0039] Further, the detachable connection of the mandrel 5 can be realized in various structures, such as plug-in connection, clamping connection, bolt connection and the like; preferably, the following structure is adopted: the mandrel supports 14 are detachably connected at the two sides of the counterweight hanger 4, specifically through bolt connection; the two ends of the mandrel 5 are respectively plug-in connected with the mandrel supports 14. When disassembling, only the mandrel support 14 at one side needs to be removed, and then the mandrel 5 can be pulled out.

[0040] Further, in order to facilitate the fixing and disassembling of the rubber-coated piston 6, the following structure is adopted: a ring of protrusions 15 is arranged at one end of the mandrel 5, the mandrel 5 is threadedly connected with a locking nut 16, the rubber-coated piston 6 is located between the ring of protrusions 15 and the locking nut 16, and the protrusions 15 and the locking nut 16 are tightened to clamp and fix the rubber-coated piston 6.

[0041] Further, in order to avoid damage to the rubber-coated piston 6 caused by the locking nut 16 and the protrusions 15, two mandrel gaskets 17 are further included, and the two mandrel gaskets 17 are sleeved on the mandrel 5 and located at the two sides of the rubber-coated piston 6.

[0042] Further, in order to fix the positions of the rubber-coated piston 6 and the mandrel gaskets 17, a corresponding pin shaft can be arranged, and a gasket pin 18 is further arranged, which can pass through the mandrel gasket 17 at one side of the rubber-coated piston 6, the rubber-coated piston 6 and the mandrel gasket 17 at the other side of the rubber-coated piston 6 in sequence.

[0043] Further, in order to facilitate the connection with the tension-compression sensor 8 (rope 9), a mandrel lifting ring 19 is fixedly connected at one end of the mandrel 5, and the tension-compression sensor 8 is connected with the mandrel lifting ring 19; specifically, the rope 9 can be tied on the mandrel lifting ring 19.

[0044] The above only describes the preferred embodiments of the present application in detail, but the present application is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application, and all the changes shall be included in the protection scope of the present application.

Claims

1. A friction force testing machine for a rubber-coated piston with large lateral force, characterized in that: The system includes a frame (1) and a linear motion mechanism (2). The linear motion mechanism (2) is fixed on the frame (1). The frame (1) has a test slot (3). A counterweight bracket (4) is provided at the test slot (3). A spindle (5) is detachably connected to the counterweight bracket (4). A rubber-coated piston (6) is fixed on the spindle (5). The test slot (3) is open at the top. The rubber-coated piston (6) is located in the test slot (3) and can move along the test slot (3). A counterweight block (7) is connected to the bottom of the counterweight bracket (4). The linear motion mechanism (2) is connected to the spindle (5) through a tension-compression sensor (8). The linear motion mechanism (2) pulls the traction sensor, the counterweight bracket (4), the spindle (5), and the rubber-coated piston (6) on it to move along the test slot (3). The system also includes a reset push rod (10). 10) Fixed on the linear moving mechanism (2), the end of the reset push rod (10) can contact the spindle (5); the reset push rod (10) is driven to move by the linear moving mechanism (2), the reset push rod (10) pushes the counterweight bracket (4), the spindle (5) and the rubber-coated piston (6) on it to move in the opposite direction along the test groove (3); a semi-cylindrical track (11) is fixed on the frame (1), and the two ends of the semi-cylindrical track (11) are sealed to form the test groove (3); the counterweight block (7) is located at the bottom of the frame (1), the counterweight block (7) is connected to the counterweight bracket (4) through the connecting rod (12), the counterweight block (7) and the connecting rod (12) are detachably connected, the connecting rod (12) can pass through the frame (1) and be fixedly connected or hinged to the counterweight bracket (4), and the frame (1) is provided with corresponding slots (13).

2. The friction force testing machine for a rubber-coated piston with large lateral force according to claim 1, characterized in that: The linear motion mechanism (2) uses a linear motor. The base of the linear motor is fixedly connected to the frame (1). One end of the tension-compression sensor (8) is fixed on the moving part of the linear motor. The other end of the tension-compression sensor (8) is connected to the spindle (5) through a rope (9). The two ends of the rope (9) are fixedly connected to the other end of the tension-compression sensor (8) and the spindle (5) respectively.

3. The friction force testing machine for a rubber-coated piston with large lateral force according to claim 1, characterized in that: The counterweight bracket (4) is detachably connected to the two sides of the spindle bracket (14), and the two ends of the spindle (5) are respectively inserted into the spindle bracket (14).

4. The friction force testing machine for a rubber-coated piston with large lateral force according to claim 1, characterized in that: One end of the spindle (5) is provided with a ring of protrusions (15), and a locking nut (16) is threadedly connected to the spindle (5). The rubber-coated piston (6) is located between the ring of protrusions (15) and the locking nut (16), and the rubber-coated piston (6) is fixed by the locking nut (16).

5. The friction force testing machine for a rubber-coated piston with large lateral force according to claim 4, characterized in that: It also includes two mandrel washers (17), which are fitted on the mandrel (5) and located on both sides of the rubber-coated piston (6).

6. The friction force testing machine for a rubber-coated piston with large lateral force according to claim 5, characterized in that: It also includes a gasket pin (18), which can pass through the spindle gasket (17) on one side of the rubber-coated piston (6), the rubber-coated piston (6), and the spindle gasket (17) on the other side of the rubber-coated piston (6) in sequence.

7. A friction testing machine for a rubber-coated piston with large lateral force according to any one of claims 1 to 6, characterized in that: One end of the spindle (5) is fixedly connected to the spindle lifting ring (19), and the tension-compression sensor (8) is connected to the spindle lifting ring (19).

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