A clamping block friction testing device

Abstract

The present application relates to a kind of clamping block friction test devices, belong to the field of clamping block friction test of banding connection unlocking device;Mounting frame is placed on the upper surface of support frame;Top block is vertically arranged on the inner side wall of one side of mounting frame;Simulation clamping block is vertically pasted on the side wall of top block;The front of simulation separator is embedded and fitted with simulation clamping block;The back of simulation separator extends into the side wall of the opposite side of mounting frame;Pressure assembly is horizontally arranged on the outside of mounting frame;One end of pressure assembly extends into the back of simulation separator and is screwed with mounting frame;Horizontal pressure is applied by pressure assembly, simulation separator, simulation clamping block is pressed on top block, and balanced state is maintained;External tension machine is installed above simulation clamping block;Slowly and evenly lift external tension machine upwards, and the tension value measured by external tension machine is the friction of simulation clamping block under corresponding pressure;The present application has the advantages of adjustable positive pressure, reusable, small volume, easy to operate, low cost and the like.

Description

Technical Field

[0001] This invention belongs to the field of testing the friction force of clamping blocks in a strap connection unlocking device, and relates to a device for testing the friction force of clamping blocks. Background Technology

[0002] The strap connection and unlocking device is used for the connection and separation between launch vehicles and payloads, spacecraft, etc., and is a key component. The clamp is an important part of the strap connection and unlocking device. During actual operation, the clamp's back side is uniformly pressed against the inner separating body by the strap. Besides achieving the connection between the separating bodies, the friction generated by the positive pressure between the clamp and the separating body prevents the upper and lower separating bodies from rotating relative to each other. The friction between the clamp and the separating body is crucial to the torsional stiffness of the separating body connection. It is necessary to measure the magnitude of the friction during the clamp's operation during the development phase to determine whether to add or remove other anti-torsion measures.

[0003] To ensure the reliability of the strap connection unlocking device's separation, lubrication is typically applied to the clamping block and the separating body. Different lubrication methods result in different coefficients of friction for the clamping block, leading to varying frictional forces. Therefore, it is necessary to test the frictional forces of the clamping block under various lubrication conditions. Only results obtained from measurements of the clamping block's frictional force under operational conditions are valid.

[0004] Traditional friction testing involves preparing standard specimens and performing the test on a friction testing machine. However, because the clamping block has an irregular structure and bears a large load, it deforms under heavy loads. This deformation results in uneven pressure on the block's surface, causing inconsistent local deformation and affecting the magnitude of the friction force. Using standard specimens cannot accurately simulate the stress conditions experienced during operation. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a clamp friction force testing device, which has the advantages of adjustable positive pressure, reusability, small size, convenient operation and low cost.

[0006] The solution of the present invention is:

[0007] A clamping block friction force testing device includes a pressure component, a simulated separator, a simulated clamping block, a top block, a mounting frame, and a support frame. The support frame is placed horizontally; the mounting frame is placed on the upper surface of the support frame; the top block is vertically mounted on the inner side wall of one side of the mounting frame; the simulated clamping block is vertically attached to the side wall of the top block; the front of the simulated separator is embedded in the simulated clamping block; the back of the simulated separator extends into the opposite side wall of the mounting frame; the pressure component is horizontally positioned outside the mounting frame, corresponding to the back of the simulated separator; one end of the pressure component extends into the mounting frame and is threaded into the back of the simulated separator; horizontal pressure is applied by the pressure component to press the simulated separator and the simulated clamping block onto the top block, maintaining a balanced state; an external tensile testing machine is installed above the simulated clamping block; the external tensile testing machine is slowly and evenly raised upwards, and the tensile force measured by the external tensile testing machine is the friction force of the simulated clamping block under the corresponding pressure.

[0008] In the aforementioned clamping block friction testing device, a ring pull ring is provided at the top of the simulated clamping block; the bottom of the external tensioning machine is hooked onto the ring pull ring, so that when the external tensioning machine is lifted, a vertical upward tension is generated on the simulated clamping block.

[0009] In the aforementioned clamp friction force testing device, the simulated clamp is a vertically placed plate-like structure; the side wall of the simulated clamp that contacts the top block is a planar side wall; two grooves are vertically arranged on the side wall of the simulated clamp that cooperates with the simulated clamp; the two grooves are arranged in parallel and symmetrically, and the cross-section of the grooves is trapezoidal.

[0010] In the aforementioned clamp friction force testing device, the simulated separator includes a coupling and a cylindrical section; wherein, the front of the coupling is embedded and fitted with the simulated clamp; the back of the coupling is a planar structure; and the cylindrical section is axially and horizontally positioned at the center of the back of the coupling.

[0011] In the aforementioned clamp friction force testing device, the front of the connector is provided with two protrusions; the cross-section of the protrusions is a trapezoidal structure; the positions of the two protrusions correspond to the positions of the two grooves of the simulated clamp, and the shape and size of the protrusions correspond to the grooves; when the simulated separator and the simulated clamp are engaged, the two protrusions are embedded in the two grooves respectively.

[0012] In the aforementioned clamp friction testing device, one end of the cylindrical section is connected to the back of the connector, and the other end of the cylindrical section extends horizontally into the side wall of the mounting frame. The other end of the cylindrical section has a built-in threaded hole, through which the cylindrical section is connected to the pressure component.

[0013] In the aforementioned clamp friction force testing device, the pressure assembly includes a loading bolt, a pressure cylinder, a compression spring, and a piston; wherein, the pressure cylinder is a cylindrical structure placed horizontally in the axial direction; the loading bolt, the compression spring, and the piston are disposed in the inner cavity of the pressure cylinder; the loading bolt extends out of one axial end of the pressure cylinder, and the extended end of the loading bolt is connected to an external loading device; the piston extends out of the other axial end of the pressure cylinder; and the compression spring is disposed between the loading bolt and the piston.

[0014] In the aforementioned clamp friction force testing device, the protruding end of the piston is provided with an external thread, and the piston and the cylindrical section are engaged by the thread; the portion of the loading bolt located in the inner cavity of the pressure cylinder is engaged with the inner wall of the cylindrical section by the thread; the portion of the loading bolt extending out of the pressure cylinder is a hexagonal tenon.

[0015] In the aforementioned clamp friction force testing device, the horizontal loading process of the pressure component is as follows:

[0016] Rotate the hexagonal tenon of the loading bolt to move the loading bolt horizontally and compress the compression spring; the pressure generated by the compression spring is transmitted to the simulated separator through the piston, pressing the simulated separator and the simulated clamping block onto the top block and maintaining a balanced state.

[0017] In the aforementioned clamp friction force testing device, the working stroke of the compression spring is adjusted by the screwing depth of the loading bolt; different working strokes of the compression spring generate different horizontal pressures.

[0018] The advantages of this invention compared to the prior art are:

[0019] (1) The present invention uses a clamping block friction force testing device, which can simulate the testing of the friction force of the clamping block under real working conditions. Compared with the conventional standard test piece, it can more realistically reflect the influencing factors such as the deformation and pressure distribution of the clamping block under working conditions, and the test results are more accurate.

[0020] (2) The clamp friction force testing device of the present invention uses a spring as a power source. The surface unevenness of the clamp has a negligible effect on the spring force. During the movement of the clamp, the spring thrust remains constant, so that the normal pressure of the clamp is always uniform.

[0021] (3) The clamp friction force testing device of the present invention adjusts the spring stroke by rotating the loading nut, thereby changing the spring thrust and realizing the device has a positive pressure adjustable function;

[0022] (4) The clamp friction force testing device of the present invention can be reused and can realize the comparison and verification of the clamp friction force under different lubrication measures and different positive pressures under the same installation conditions. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the overall structure of the clamp friction force testing device of the present invention;

[0024] Figure 2 This is a schematic diagram of the simulated clamping block of the present invention;

[0025] Figure 3 This is a schematic diagram of the simulated separator of the present invention;

[0026] Figure 4 This is a schematic diagram of the pressure component of the present invention;

[0027] Figure 5 This is a schematic diagram of the mounting frame of the present invention. Detailed Implementation

[0028] The present invention will be further described below with reference to the embodiments.

[0029] This invention provides a clamp friction force testing device that can effectively simulate the installation and force conditions of clamps. The device is reusable and can be used to compare and verify the magnitude of clamp friction force under different lubrication measures and different normal pressures. It has the advantages of adjustable normal pressure, reusability, small size, convenient operation, and low cost.

[0030] Clamp friction force testing device, such as Figure 1 As shown, it specifically includes a pressure assembly 1, a simulated separator 2, a simulated clamping block 3, a top block 4, a mounting frame 5, and a support frame 6; wherein, the support frame 6 is placed horizontally; the structure of the mounting frame 5 is as follows. Figure 5 As shown, the mounting frame 5 is placed on the upper surface of the support frame 6; the top block 4 is vertically set on the inner side wall of one side of the mounting frame 5; the simulated clamping block 3 is vertically placed against the side wall of the top block 4; the front of the simulated separator 2 is embedded in the simulated clamping block 3; the back of the simulated separator 2 extends into the side wall of the opposite side of the mounting frame 5; the pressure component 1 is horizontally set on the outside of the mounting frame 5, and its position corresponds to the back of the simulated separator 2; one end of the pressure component 1 extends into the mounting frame 5 and is threaded into the back of the simulated separator 2; the pressure component 1 applies horizontal pressure to press the simulated separator 2 and the simulated clamping block 3 onto the top block 4 and maintain a balanced state; an external tensioning machine is installed above the simulated clamping block 3; the external tensioning machine is slowly and evenly lifted upwards, and the tension value measured by the external tensioning machine is the friction force of the simulated clamping block 3 under the corresponding pressure.

[0031] like Figure 2 As shown, the top of the simulated clamping block 3 is provided with an annular pull ring; the bottom of the external tensioning machine is hooked on the annular pull ring, so that when the external tensioning machine is lifted, it generates a vertical upward pulling force on the simulated clamping block 3.

[0032] The specific structure of the simulated clamping block 3 is as follows: the simulated clamping block 3 is a vertically placed plate-like structure; the side wall of the simulated clamping block 3 that contacts the top block 4 is a planar side wall; the side wall of the simulated clamping block 3 that cooperates with the simulated clamping block 3 on the opposite side is vertically provided with two grooves; the two grooves are arranged in parallel and symmetrically, and the cross-section of the grooves is trapezoidal.

[0033] like Figure 3 As shown, the simulated separator 2 includes a connector 21 and a cylindrical section 22; wherein, the front of the connector 21 is embedded and fitted with the simulated clamping block 3; the back of the connector 21 is a planar structure; and the cylindrical section 22 is axially and horizontally positioned at the center of the back of the connector 21.

[0034] The connector 21 has two protrusions on its front side; the protrusions have a trapezoidal cross-section; the positions of the two protrusions correspond to the positions of the two grooves of the simulated clamping block 3, and the shape and size of the protrusions correspond to the grooves; when the simulated separator 2 and the simulated clamping block 3 are engaged, the two protrusions are embedded in the two grooves respectively. One end of the cylindrical section 22 is connected to the back of the connector 21, and the other end of the cylindrical section 22 extends horizontally into the side wall of the mounting frame 5, and the other end of the cylindrical section 22 has a built-in threaded hole, through which the cylindrical section 22 is connected to the pressure assembly 1.

[0035] like Figure 4 As shown, the pressure assembly 1 includes a loading bolt 11, a pressure cylinder 12, a compression spring 13, and a piston 14; wherein, the pressure cylinder 12 is a cylindrical structure placed horizontally in the axial direction; the loading bolt 11, the compression spring 13, and the piston 14 are disposed in the inner cavity of the pressure cylinder 12; the loading bolt 11 extends out of one axial end of the pressure cylinder 12, and the extended end of the loading bolt 11 is connected to an external loading device; the piston 14 extends out of the other axial end of the pressure cylinder 12; the compression spring 13 is disposed between the loading bolt 11 and the piston 14.

[0036] The piston 14 has an external thread at its protruding end, and the piston 14 is threadedly engaged with the cylindrical section 22; the portion of the loading bolt 11 located in the inner cavity of the pressure cylinder 12 is threadedly engaged with the inner wall of the cylindrical section 22; the portion of the loading bolt 11 extending out of the pressure cylinder 12 is a hexagonal tenon.

[0037] The horizontal loading process of pressure component 1 is as follows:

[0038] Rotating the hexagonal tenon of the loading bolt 11 causes it to move horizontally, compressing the compression spring 13. The pressure generated by the compression spring 13 is transmitted to the simulated separator 2 through the piston 14, pressing the simulated separator 2 and the simulated clamping block 3 onto the top block 4 and maintaining a balanced state. The working stroke of the compression spring 13 is adjusted by the screw depth of the loading bolt 11; different working strokes of the compression spring 13 generate different horizontal pressures.

[0039] The simulated separator 2 has two protrusions with a V-shaped cross-section. The interface dimensions and configuration are the same as the separator, matching the two V-shaped grooves of the clamping block. The simulated clamping block 3 has two grooves with a V-shaped cross-section, matching the two V-shaped protrusions of the simulated connector. The simulated separator 2 and the simulated clamping block 3 are joined together by the two V-shaped protrusions and grooves. The back of the simulated clamping block 3 is flat and fits against the upper surface of the pressure block, which is fixed to the side of the mounting frame 5. The back of the simulated separator 2 has a cylindrical section that passes through the mounting frame 5. The cylindrical section has a threaded hole. Positive pressure is applied to the cylindrical section by the pressure assembly 1, pressing the simulated separator 2 and the simulated clamping block 3 onto the top block 4 and maintaining a balanced state.

[0040] Pressure assembly 1 is fixed to mounting frame 5 through mounting holes in the pressure cylinder. The pressure cylinder has a guide hole at its front end, through which the piston rod passes. The front end of the piston rod is threaded, connecting to the threaded section within the cylindrical section of the simulated separator 2. The piston disc at the rear end of the piston is located within the circular inner cavity of the pressure cylinder. The piston disc at the rear end of the piston is in contact with the end face of the compression spring, which is positioned in the middle of the inner cavity of the pressure cylinder. The other end of the compression spring is in contact with the loading bolt. One end of the loading bolt has an external thread, which connects to the internal thread of the pressure cylinder. The other end of the loading bolt is a hexagonal tenon.

[0041] Rotating the hexagonal tenon of the loading bolt compresses the spring. The pressure generated by the spring is transmitted to the simulated separator 2 via the piston, pressing the simulated separator 2 and the simulated clamping block 3 together. The working stroke of the spring can be adjusted by the screw depth of the loading bolt. Different working strokes of the spring generate different positive pressures, allowing for flexible adjustment of the positive pressure between the simulated clamping block 3 and the simulated separator 2. After adjusting the positive pressure, the assembly is installed on the support frame 6 and then on the tensile testing machine. The installation orientation of the support frame 6 is adjusted so that the annular pull ring on the simulated clamping block 3 is in the center of the tensile testing machine. The tensile testing machine is connected to the pull ring, and the machine is slowly and evenly raised upwards. The tensile force measured by the machine is the frictional force of the clamping block simulation component under the corresponding pressure.

[0042] Furthermore, the pressure assembly 1 consists of a loading nut 11, a pressure cylinder 12, a compression spring 13, and a piston 14. The pressure cylinder has a guide hole at its front end, through which the piston rod passes. The piston disc at the rear end of the piston is located within the circular inner cavity of the pressure cylinder. The piston disc at the rear end of the piston is in contact with the end face of the compression spring, which is positioned in the middle of the inner cavity of the pressure cylinder. The other end of the compression spring is in contact with the loading bolt. One end of the loading bolt has an external thread, which connects to the internal thread of the pressure cylinder. The other end of the loading bolt is a hexagonal tenon.

[0043] Furthermore, the simulated clamping block 3 has two grooves with a V-shaped cross-section; there is a tension ring at the upper and lower center positions of the simulated clamping block 3.

[0044] Furthermore, the simulated separator 2 has two protrusions with a V-shaped cross-section; the back of the simulated separator 2 has a cylindrical section that passes through the mounting frame 5 and has threaded holes.

[0045] Furthermore, there is a mounting boss on the side of the mounting frame 5, and a mounting hole in the middle of the mounting boss; there are four mounting lugs on the top of the mounting frame 5, and the upper and lower mounting lugs are symmetrical.

[0046] Furthermore, the pressure cylinder has an annular inner cavity structure, with a guide hole in the middle of the front end and a connecting hole on the outer flange of the front section. An anti-rotation hole is opened in the middle part of the pressure cylinder, and the inner cavity of the rear end has an internal thread structure.

[0047] Furthermore, the front section of the piston is a push rod, the end of which is an externally threaded section, and the rear end of the piston is a piston disc with anti-rotation grooves around its perimeter.

[0048] Furthermore, the loading bolt has an external thread on one end and a hexagonal tenon on the other.

[0049] Pressure assembly 1 assembly: The piston guide shaft section is placed inward into the pressure cylinder, and the piston rod passes through the guide hole of the pressure cylinder; the compression spring is placed in the pressure cylinder, and the loading bolt with the external thread is screwed inward into the pressure cylinder; the pressure assembly 1 is fixed to the mounting frame 5 through the mounting hole of the pressure cylinder.

[0050] The top block 4 is fixed inside the side of the mounting frame 5; the cylindrical section on the back of the simulated separator 2 is inserted into the circular mounting hole of the mounting frame 5; a flathead screwdriver is inserted through the anti-rotation hole on the pressure cylinder and locked into the anti-rotation groove of the piston disc; rotate the simulated separator 2 to screw and tighten the internal thread of the cylindrical section into the threaded end of the piston rod; loosen the flathead screwdriver and adjust the simulated separation orientation so that the V-groove is vertical; push the simulated separator 2 inward with force, and the simulated clamping block 3 is locked between the simulated separator 2 and the top block 4; the simulated separator 2 and the simulated clamping block 3 are fitted together by two V-shaped protrusions and grooves.

[0051] Rotating the hexagonal tenon of the loading bolt inward compresses the spring. The pressure generated by the spring is transmitted to the simulated separator 2 via the piston, pressing the simulated separator 2 and the simulated clamping block 3 together. The working stroke of the spring can be adjusted by the screw depth of the loading bolt. Different working strokes of the spring generate different positive pressures, allowing for flexible adjustment of the positive pressure between the simulated clamping block 3 and the simulated separator 2. After adjusting the positive pressure, the assembly is installed on the support frame 6 and then on the tensile testing machine. The installation orientation of the support frame 6 is adjusted so that the annular pull ring on the simulated clamping block 3 is in the middle position of the tensile testing machine. The tensile testing machine is connected to the pull ring, and the machine is slowly and evenly raised upward. The tensile force measured by the machine is the frictional force of the clamping block simulation component under the corresponding pressure.

[0052] The friction testing device is reusable and can be used to compare and verify the friction force of the clamps under different lubrication conditions and normal pressures. It has advantages such as adjustable normal pressure, reusability, small size, easy operation, and low cost.

[0053] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A clamping block friction force testing device, wherein the clamping block is a component of a strap connection and unlocking device, characterized in that: The system includes a pressure assembly (1), a simulated separator (2), a simulated clamping block (3), a top block (4), a mounting frame (5), and a support frame (6); wherein the support frame (6) is placed horizontally; the mounting frame (5) is placed on the upper surface of the support frame (6); the top block (4) is vertically set on the inner side wall of one side of the mounting frame (5); the simulated clamping block (3) is vertically attached to the side wall of the top block (4); the front of the simulated separator (2) is embedded and fitted with the simulated clamping block (3); the back of the simulated separator (2) extends into the side wall of the opposite side of the mounting frame (5); the pressure assembly (1) The pressure assembly (1) is set horizontally on the outside of the mounting frame (5) and its position corresponds to the back of the simulated separator (2); one end of the pressure assembly (1) extends into the mounting frame (5) and is threaded into the back of the simulated separator (2); the pressure assembly (1) applies horizontal pressure to press the simulated separator (2) and the simulated clamp (3) onto the top block (4) and maintain a balanced state; the external tension machine is installed above the simulated clamp (3); the external tension machine is slowly and evenly lifted upwards, and the tension value measured by the external tension machine is the friction force of the simulated clamp (3) under the corresponding pressure; The top of the simulated clamping block (3) is provided with an annular pull ring; the bottom of the external tensioning machine is hooked on the annular pull ring, so that when the external tensioning machine is lifted, a vertical upward pulling force is generated on the simulated clamping block (3); The simulated separator (2) includes a connector (21) and a cylindrical section (22); wherein, the front of the connector (21) is embedded and fitted with the simulated clamping block (3); the back of the connector (21) is a planar structure; the cylindrical section (22) is axially and horizontally positioned at the center of the back of the connector (21); The front of the connector (21) is provided with two protrusions; the cross section of the protrusions is a trapezoidal structure; the positions of the two protrusions correspond to the positions of the two grooves of the simulated clamping block (3), and the shape and size of the protrusions correspond to the grooves; when the simulated separator (2) and the simulated clamping block (3) are engaged, the two protrusions are embedded in the two grooves respectively. One end of the cylindrical section (22) is connected to the back of the connector (21), and the other end of the cylindrical section (22) extends horizontally into the side wall of the mounting frame (5). The other end of the cylindrical section (22) has a built-in threaded hole, through which the cylindrical section (22) is connected to the pressure assembly (1). The pressure assembly (1) includes a loading bolt (11), a pressure cylinder (12), a compression spring (13), and a piston (14); wherein, the pressure cylinder (12) is a cylindrical structure placed horizontally in the axial direction; the loading bolt (11), the compression spring (13), and the piston (14) are disposed in the inner cavity of the pressure cylinder (12); the loading bolt (11) extends out of one axial end of the pressure cylinder (12), and the extended end of the loading bolt (11) is connected to an external loading device; the piston (14) extends out of the other axial end of the pressure cylinder (12); the compression spring (13) is disposed between the loading bolt (11) and the piston (14); The piston (14) has an external thread at its extended end, and the piston (14) and the cylindrical section (22) are connected by the thread; the part of the loading bolt (11) located in the inner cavity of the pressure cylinder (12) is connected to the inner wall of the cylindrical section (22) by the thread; the part of the loading bolt (11) extending out of the pressure cylinder (12) is a hexagonal tenon.

2. The clamp friction force testing device according to claim 1, characterized in that: The simulated clamping block (3) is a vertically placed plate-shaped structure; the side wall of the simulated clamping block (3) that contacts the top block (4) is a planar side wall; the side wall of the simulated clamping block (3) that cooperates with the simulated clamping block (3) on the opposite side is vertically provided with two grooves; the two grooves are arranged in parallel and symmetrically, and the cross-section of the grooves is trapezoidal.

3. The clamp friction force testing device according to claim 2, characterized in that: The horizontal loading process of pressure component (1) is as follows: Rotate the hexagonal tenon of the loading bolt (11) to make the loading bolt (11) move horizontally to compress the compression spring (13); the pressure generated by the compression spring (13) is transmitted to the simulated separator (2) through the piston (14), pressing the simulated separator (2) and the simulated clamp (3) onto the top block (4) and maintaining a balanced state.

4. The clamp friction force testing device according to claim 3, characterized in that: The working stroke of the compression spring (13) is adjusted by the screwing depth of the loading bolt (11); different working strokes of the compression spring (13) generate different horizontal pressures.

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