A device for manufacturing a steel strand tensile test clamp

Abstract

The application relates to a steel strand tensile test clamp manufacturing device, and belongs to the field of engineering material detection. The device comprises a rack, a stamping mechanism and a glue brushing assembly are arranged on the rack, the stamping mechanism comprises a bottom die and a punch, the bottom die is arranged on the rack, the punch is slidably connected with the rack, a forming groove is arranged on one side of the bottom die facing the punch, the formed clamp is located in the forming groove and between the punch and the bottom die, and a structure groove is formed on the clamp through the stamping mechanism; the glue brushing assembly comprises a glue storage box, a conveying pipe and a power source, a glue applying channel is arranged on the punch, the glue storage box, the conveying pipe and the glue applying channel are sequentially communicated, the power source is used for controlling the air pressure in the glue storage box, and the port of one end of the glue applying channel away from the conveying pipe is located on one side of the punch facing the groove bottom of the forming groove. The application realizes the continuous working operation of clamp forming, glue applying and sand covering on one device, improves the clamp manufacturing efficiency and the operation efficiency of the steel strand tensile test.

Description

Technical Field

[0001] This application relates to the field of engineering material testing, and in particular to a device for manufacturing a tensile test clip for steel strands. Background Technology

[0002] Steel strand is a steel product made of multiple steel wires twisted together. The surface of carbon steel can be coated with various layers, such as galvanized, zinc-aluminum alloy, aluminum cladding, copper plating, or epoxy resin coating, as needed. It is widely used in long-span railways and highways, bridges, crane beams, geotechnical anchoring projects, and multi-story industrial buildings. Tensile strength is one of the important mechanical parameters of steel strand. In the tensile test of steel strand, both ends of the strand need to be clamped with fixtures before being stretched.

[0003] An aluminum clip is usually installed between the clamp and the steel strand. The clip is V-shaped. When stretched, the clip fits against the side wall of the end of the steel strand. In order to increase the friction between the two, a layer of diamond grit is usually glued to the clip.

[0004] When making clips, aluminum plates are usually hammered into a V shape by hand, and then glue and sand are applied. As a result, when the number of product tests is large, the production of clips greatly affects the overall efficiency of the test. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a device for manufacturing steel strand tensile test clamps.

[0006] The technical solution of the steel strand tensile test clip manufacturing device provided in this application is as follows:

[0007] A device for manufacturing tensile test clamps for steel strands includes a frame, on which a stamping mechanism and a glue-applying assembly are mounted. The stamping mechanism includes a bottom mold and a punch. The bottom mold is mounted on the frame, and the punch is slidably connected to the frame. A forming groove is formed on the side of the bottom mold facing the punch. The formed clamp is located in the forming groove and between the punch and the bottom mold. A structural groove is formed on the clamp by the stamping mechanism. The glue-applying assembly includes a glue storage box, a delivery pipe, and a power source. A glue-applying channel is formed on the punch. The glue storage box, delivery pipe, and glue-applying channel are connected in sequence. The power source is used to control the air pressure in the glue storage box. The end of the glue-applying channel away from the delivery pipe is located on the side of the punch facing the bottom of the forming groove.

[0008] By adopting the above technical solution, the stamping component bends the sheet metal, and after the punch stamps the clamping piece, the glue application component starts working. The glue is applied to the surface of the clamping piece by extrusion. After the mold is opened, the clamping piece can be directly bonded with sand, which improves the ease of operation of the clamping piece forming and glue application process.

[0009] Preferably, both the clamping piece and the punch are divided into a sand-coated area and a smooth area along their own length, and the port of the adhesive application channel is located in the sand-coated area of ​​the punch.

[0010] By adopting the above technical solution, the glue does not cover the entire clip during application, and the smooth area does not come into contact with the glue, making it easier for the operator to pick up the clip and grip it.

[0011] Preferably, the bottom mold slides relative to the frame, and the sliding direction is parallel to the length direction of the clamping piece. The frame is provided with a travel groove for the bottom mold to slide. A uniform adhesive is fixedly connected to the punch in the sand covering area. The uniform adhesive is elastic and abuts against the surface of the structural groove of the clamping piece.

[0012] Preferably, a plurality of stamped balls are embedded at one end of the punch facing the clamping piece, and the plurality of stamped balls are arranged along the length direction of the punch, and the stamped balls abut against the bottom of the structural groove.

[0013] By adopting the above technical solution, after a small amount of glue is squeezed out through the glue application channel on the surface of the punch, the operator can repeatedly push and pull the bottom mold to make the clamping piece and the punch move relative to each other. During the movement, the glue is evenly applied to the surface of the structural groove, and at the same time, the stamping ball rolls and abuts against the bottom of the structural groove, making the forming effect of the clamping piece more uniform.

[0014] Preferably, the bottom mold is provided with a positioning component, and a positioning hole is provided on the frame and on the wall of the travel groove. The positioning component includes a positioning pin, a positioning spring, a connecting rope, an operating handle, and a control block. The operating handle is fixedly connected to the bottom mold, and the positioning pin is slidably connected to the bottom mold. The sliding direction is perpendicular to the moving direction of the bottom mold. One end of the positioning spring is connected to the positioning pin, and the other end is connected to the bottom mold. One end of the connecting rope is connected to the positioning pin, and the other end is connected to the control block. The control block is slidably connected to the operating handle, and the end of the positioning pin away from the connecting rope is inserted into the positioning hole.

[0015] By adopting the above technical solution, in the natural state, the positioning spring applies elastic force to the positioning pin, and one end of the positioning pin protrudes from the side wall of the punch. When the positioning pin is inserted into the positioning hole, the bottom mold cannot move relative to the frame, and at this time the groove opening of the forming groove is directly opposite the punch. When the operator pulls the control block, the control block can apply a pulling force to the positioning pin through the connecting rope, causing the positioning pin to retract into the bottom mold. At this time, the bottom mold can slide in the travel groove.

[0016] Preferably, the bottom mold rotates relative to the frame, and the rotation axis is parallel to the direction of movement of the bottom mold relative to the frame. A sand cavity is provided on the frame. The sand cavity is located on the side of the bottom mold away from the punch and is connected to the travel groove. Sand is placed in the sand cavity. A sand covering assembly is also provided on the frame. The sand covering assembly is used to move the sand upward.

[0017] By adopting the above technical solution, after the clamping plate is coated with adhesive, the operator controls the bottom mold to move and rotate the clamping plate until the structural groove of the clamping plate is above the sand cavity and the sand coating area of ​​the clamping plate is facing the sand. Then the sand coating component can start to work to move the sand upward. When the sand comes into contact with the adhesive on the clamping plate, there is a high probability that it can be directly adhered to the clamping plate through the adhesive, thereby completing the sand coating process.

[0018] Preferably, the sand covering assembly includes a sand holding membrane, a sand lifting motor, and a vibrating rod. The sand holding membrane is fixedly connected to the inner wall of the sand chamber. The sand is placed on the sand holding membrane. The vibrating rod is located on the side of the sand holding membrane away from the sand and rotates relative to the frame. The rotation axis of the vibrating rod is perpendicular to its own length direction. A striking ball is fixedly connected to the end of the vibrating rod, and the striking ball abuts against the sand holding membrane.

[0019] By adopting the above technical solution, when the sand-lifting motor starts, the vibrating rod rotates around the output shaft of the sand-lifting motor, and each striking ball strikes the lower surface of the sand-holding membrane in turn, causing the sand material above it to be lifted up by the vibration.

[0020] Preferably, the sand covering assembly further includes a foot switch, which is electrically connected to the sand-spraying motor.

[0021] By adopting the above technical solution, the sand-lifting motor can only be started when the operator presses the foot switch.

[0022] Preferably, a follower disk is rotatably connected to the end of the frame and located in the travel groove. The rotation axis of the follower disk coincides with the rotation axis of the bottom mold. An elastic pad is fixedly connected to the side of the follower disk facing the bottom mold, and the elastic pad abuts against the end of the clamping piece.

[0023] By adopting the above technical solution, when the operator pushes the bottom mold toward the follower plate and moves it to the end of the travel groove, the elastic pad and the end of the clamping plate abut against each other. Then the operator controls the bottom mold to rotate. During this process, the positional stability between the clamping plate and the bottom mold is guaranteed due to the abutting action of the elastic pad against the clamping plate.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. Through the setting of stamping mechanism, glue application component and sand coating component, the stamping component bends the sheet metal. After the punch stamps the clamping piece, the glue application component starts to work. The glue is applied to the surface of the clamping piece by extrusion. After the mold is opened, the clamping piece can be directly bonded with sand. Then the bottom mold moves to the end of the travel groove and rotates the bottom mold so that the opening of the structural groove faces the sand cavity. The sand coating component starts to work, causing the sand in the sand cavity to be lifted. When some sand comes into contact with the glue, it directly adheres to the clamping piece, completing the sand coating. The whole continuous process is efficient and simple.

[0026] 2. The operator can control the start and stop of the sand-lifting motor by using the operating handle and foot switch. The sand-lifting motor can only start working when the operator pushes the bottom mold forward and rotates it and then steps on the foot switch, so that the sand on the sand-holding membrane can be lifted up under the action of vibration. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the structure of the device for making steel strand tensile test clips in the embodiments of this application.

[0028] Figure 2 This is a structural schematic diagram illustrating the stamping mechanism in the embodiments of this application.

[0029] Figure 3 This is a schematic diagram illustrating the connection structure between the bottom mold and the frame in the embodiments of this application.

[0030] Figure 4 This is a structural schematic diagram illustrating the positioning component in the embodiments of this application.

[0031] Figure 5 This is a schematic diagram illustrating the structure of the clip in the embodiments of this application.

[0032] Figure 6 This is a structural schematic diagram illustrating the sand-lifting component in the embodiments of this application.

[0033] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Travel groove; 12. Positioning hole; 13. Sand chamber; 2. Stamping mechanism; 21. Bottom mold; 211. Forming groove; 22. Punch; 221. Glue application channel; 23. Stamping ball; 3. Glue application assembly; 31. Glue storage box; 32. Conveying pipe; 33. Power source; 34. Glue homogenizer; 4. Positioning assembly; 41. Positioning pin; 42. Positioning spring; 43. Connecting rope; 44. Operating handle; 45. Control block; 5. Sand covering assembly; 51. Sand holding film; 52. Sand lifting motor; 521. Foot switch; 53. Vibration rod; 531. Striking ball; 54. Follower plate; 541. Elastic pad; 6. Clamping plate; 61. Structural groove. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0035] This application discloses an apparatus for manufacturing steel strand tensile test clips, such as... Figure 1 As shown, the machine includes a frame, on which a stamping mechanism and an adhesive application assembly are mounted. The stamping mechanism is used to stamp aluminum straight sheet raw material into V-shaped clamping pieces, and the adhesive application assembly is used to apply adhesive to the clamping pieces. A sand-coating assembly is located at the bottom of the frame, which is used to sprinkle diamond abrasive onto the clamping pieces.

[0036] like Figure 1 and 2 As shown, the stamping mechanism includes a bottom die and a punch. The bottom die is movably mounted on the frame, and the punch is located above the bottom die and slidably connected to the frame in a vertical direction. The sliding mechanism of the punch is similar to that of a conventional stamping press. The bottom die is cylindrical with its length in a horizontal direction. A forming groove with the same length direction is formed on the side wall of the bottom die. The side of the punch facing the bottom die has a protrusion that matches the shape of the forming groove. After stamping, the groove surfaces of the punch and the forming groove are located on opposite sides of the clamping plate. A structural groove is formed on the clamping plate, with the groove surface facing the punch. Several stamping balls are embedded at the end of the punch facing the clamping plate. The stamping balls are arranged along the length direction of the punch. During stamping, the stamping balls directly contact the bottom of the structural groove of the flat raw material or the clamping plate. There is a 1-2 mm gap between the side surface of the punch and the clamping plate.

[0037] like Figure 1 , 3 As shown in Figure 4, the frame has a travel groove for the bottom die to slide and rotate. The length direction of the travel groove is consistent with the length direction of the bottom die, and the length of the travel groove is greater than the length of the bottom die. That is, the movement direction and rotation axis of the bottom die are parallel to its own length direction. During the stamping process, the bottom die must be positioned so that the opening of the forming groove faces upward and is directly below the punch. Therefore, a positioning component is provided on the bottom die to determine the relative position of the bottom die and the frame. The positioning component includes a positioning pin, a positioning spring, a connecting rope, an operating handle, and a control block. The operating handle is fixedly connected to the end of the bottom die facing the operator. The positioning pin is slidably connected to the side wall of the bottom die in the radial direction of the bottom die. One end of the positioning spring is fixedly connected to the positioning pin, and the other end is fixedly connected to the bottom die. The control block is slidably connected to the operating handle. One end of the connecting rope is connected to the positioning pin, and the other end is connected to the control block. A positioning hole is provided on the frame and on the wall of the travel groove. In its natural state, the positioning spring applies elastic force to the positioning pin, and the end of the positioning pin away from the positioning spring protrudes from the side wall of the punch. When the positioning pin is inserted into the positioning hole, the bottom die cannot slide or rotate relative to the frame, and at this time, the opening of the forming groove is directly opposite the punch. When the operator pulls the control block, the control block applies a pulling force to the positioning pin through the connecting rope, causing the positioning pin to retract into the bottom die. At this time, the bottom die can slide or rotate within the travel groove.

[0038] like Figure 2 and 5As shown, both the clamping piece and the punch are divided into a sand-coated area and a smooth area along their length, with the sand-coated area occupying approximately four-fifths of the total length of the clamping piece or punch. The glue application assembly includes a glue storage box, a delivery pipe, and a power source. The glue storage box is fixedly connected to the frame and is filled with glue. A glue application channel is provided on the punch within its sand-coated area. The glue storage box, delivery pipe, and glue application channel are connected sequentially. The end of the glue application channel away from the delivery pipe is located on the side of the punch facing the bottom of the forming groove. The power source is used to control the air pressure inside the glue storage box. A glue homogenizer is fixedly connected to the side of the punch facing the clamping piece within the sand-coated area. The glue homogenizer needs to be elastic; in this embodiment, a brush is used. After the stamping ball presses against the clamping piece, the brush abuts against the groove surface of the structural groove.

[0039] like Figure 1 and 2 As shown, the power source includes a cylinder and a bellows. The cylinder is fixedly connected to the frame. One end of the bellows is connected to the glue storage box, and the other end is sealed and fixedly connected to the piston rod of the cylinder. The extension and retraction of the piston rod can increase or decrease the air pressure in the glue storage box, thereby moving the glue inside towards the glue application channel and finally flowing out from the surface of the punch. After a small amount of glue is squeezed out from the surface of the punch, the operator can repeatedly push and pull the bottom die to make the clamping piece move relative to the punch. During the movement, the brush spreads the glue evenly on the surface of the structural groove, while the stamping ball rolls and abuts against the bottom of the structural groove, making the forming effect of the clamping piece more uniform. After several reciprocating movements, the cylinder can control the piston rod to retract, and then the stamping mechanism can open the mold, ending the stamping and glue application process.

[0040] like Figure 1 and 6As shown, the sand-coating assembly includes a sand-holding membrane, a sand-lifting motor, and a vibrating rod. A sand chamber is located on the side of the bottom mold away from the punch and is connected to the travel groove. The bottom of the sand chamber originally runs through the frame, and the sand-holding membrane is fixedly connected to the cavity wall of the sand chamber. The sand chamber contains diamond abrasive material. A follower disc is rotatably connected to the end of the frame in the travel groove away from the operating handle. The rotation axis of the follower disc coincides with the rotation axis of the bottom mold. A rubber elastic pad is fixedly connected to the side of the follower disc facing the bottom mold. When the operator pushes the bottom mold towards the follower disc and moves it to the end of the travel groove, the elastic pad abuts against the end of the clamping plate. The elastic pad is centrally located on the follower disc, and its contact point with the clamping plate is located near the bottom of the groove in the middle of the structure, meaning the elastic pad hardly contacts the adhesive on the clamping plate. The operator controls the bottom mold to rotate 180°, so that the opening of the structural groove faces downwards. During this process, the positional stability between the clamping plates and the bottom mold is ensured due to the abutment action of the elastic pads against the clamping plates. The opening size of the sand chamber along the length of the travel groove is greater than or equal to the length of the sand-covered area. That is, when the opening of the structural groove faces downwards, the area coated with adhesive on the clamping plates is within the opening range of the sand chamber. To improve the operator's control accuracy of the rotation angle, another set of positioning holes is provided in the travel groove. When the structural groove faces directly downwards, the positioning pin can be inserted into these positioning holes.

[0041] like Figure 1 and 6 As shown, in its natural state, the lower surface of the sand-holding membrane bulges downwards. The sand-raising motor is fixedly connected to the frame, and the rotation axis of the sand-raising motor is horizontal. Multiple vibrating rods are provided, all fixedly connected to the output shaft of the sand-raising motor. The length direction of the vibrating rod is perpendicular to the axis of the output shaft of the sand-raising motor. A striking ball is fixedly connected to the end of the vibrating rod. When the sand-raising motor starts, the vibrating rod rotates around the output shaft of the sand-raising motor, and each striking ball strikes the lower surface of the sand-holding membrane in turn. The sand above is lifted by the vibration. When the sand comes into contact with the adhesive on the clamping plate, there is a high probability that it will directly adhere to the clamping plate through the adhesive, thus completing the sand coating process. The sand coating assembly also includes a foot switch, which is placed on the ground on the side of the frame facing the operator. The foot switch is electrically connected to the sand-raising motor; the sand-raising motor can only be started when the operator steps on the foot switch.

[0042] The implementation principle of the steel strand tensile test clip manufacturing device in this application is as follows:

[0043] The aluminum sheet material is placed on the bottom mold, the stamping component bends the sheet, and after the punch presses the clamping piece into shape, the glue application component starts working. The glue is applied to the surface of the clamping piece by extrusion. After the mold is opened, the bottom mold is moved to the end of the travel groove. The bottom mold is rotated so that the opening of the structural groove faces the sand chamber. The sand coating component starts working to make the sand in the sand chamber rise. When some of the sand comes into contact with the glue, it directly adheres to the clamping piece, completing the sand coating.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for making a tensile test specimen grip for a steel strand, comprising a frame, characterised in that: The rack is provided with a punching mechanism and a glue brushing assembly, the punching mechanism comprises a bottom die and a punch, the bottom die is arranged on the rack, the punch is in sliding connection with the rack, a forming groove is formed on the side of the bottom die facing the punch, the formed clamping piece is located in the forming groove and between the punch and the bottom die, and a structure groove is formed on the clamping piece by the punching mechanism; The glue brushing assembly comprises a glue storage box, a conveying pipe and a power source, a glue applying channel is formed on the punch, the glue storage box, the conveying pipe and the glue applying channel are in sequence communication, the power source is used for controlling the air pressure in the glue storage box, and the port of the glue applying channel away from the conveying pipe is located on the side of the punch facing the groove bottom of the forming groove; The clamping piece and the punch are both divided into a sand coated area and a smooth area along the length direction of the punch, and the port of the glue applying channel is located in the sand coated area of the punch; The bottom die slides relative to the rack, the sliding direction is parallel to the length direction of the clamping piece, a running groove for the sliding of the bottom die is formed on the rack, the punch is fixedly connected with a glue uniformizing body in the sand coated area, the glue uniformizing body is elastic, and the glue uniformizing body is in abutment with the groove surface of the structure groove of the clamping piece; A plurality of punching balls are embedded in the end of the punch facing the clamping piece, the plurality of punching balls are arranged along the length direction of the punch, and the punching balls are in abutment with the groove bottom of the structure groove.

2. A device for making a tensile test specimen grip for a steel strand according to claim 1, characterized in that: A positioning assembly is arranged on the bottom die, a positioning hole is formed on the groove wall of the running groove of the rack, the positioning assembly comprises a positioning pin, a positioning spring, a connecting rope, an operating handle and a control block, the operating handle is fixedly connected with the bottom die, the positioning pin is in sliding connection with the bottom die, the sliding direction is perpendicular to the moving direction of the bottom die, one end of the positioning spring is connected with the positioning pin, and the other end is connected with the bottom die, one end of the connecting rope is connected with the positioning pin, and the other end is connected with the control block, the control block is in sliding connection with the operating handle, and the end of the positioning pin away from the connecting rope is inserted into the positioning hole.

3. A device for making a tensile test specimen grip for a steel strand according to claim 2, characterized in that: The bottom die rotates relative to the rack, the rotation axis is parallel to the moving direction of the bottom die relative to the rack, a sand cavity is formed on the rack, the sand cavity is located on the side of the bottom die away from the punch and is in communication with the running groove, and sand is placed in the sand cavity; The rack is further provided with a sand coating assembly, and the sand coating assembly is used for moving the sand upward.

4. A device for making a tensile test specimen grip for a steel strand according to claim 3, characterized in that: The sand coating assembly comprises a sand containing film, a sand throwing motor and a vibrating rod, the sand containing film is fixedly connected with the inner wall of the sand cavity, the sand is placed on the sand containing film, the vibrating rod is located on the side of the sand containing film away from the sand and rotates relative to the rack, the rotation axis of the vibrating rod is perpendicular to the length direction of the vibrating rod, the end of the vibrating rod is fixedly connected with a hitting ball, and the hitting ball is in abutment with the sand containing film.

5. A device for making a tensile test specimen grip for a steel strand according to claim 4, characterized in that: The sand coating assembly further comprises a foot switch, and the foot switch is in electrical connection with the sand throwing motor.

6. A device for making a tensile test specimen grip for a steel strand as defined in claim 3, characterized in that: A follower disc is rotatably connected to the end of the running groove of the rack, the rotation axis of the follower disc coincides with the rotation axis of the bottom die, an elastic pad is fixedly connected to the side of the follower disc facing the bottom die, and the elastic pad is in abutment with the end of the clamping piece.

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