Steel bar sample clamp

Abstract

The utility model discloses a steel bar sample clamp. A parallel pneumatic finger air cylinder is installed on a connecting disc capable of being connected with a wrist of a robot, two parallel clamping jaws of the air cylinder are connected with an upper clamp base and a lower clamp base respectively, the upper clamp base and the lower clamp base are connected with an upper clamping arm and a lower clamping arm respectively, and the two parallel clamping jaws move in the opposite direction or in the opposite direction to drive the upper clamping arm and the lower clamping arm to clamp a sample or release the sample. The three V-shaped grooves are symmetrically formed in the opposite sides of the working end of the upper clamping arm and the working end of the lower clamping arm, three samples can be clamped at the same time, the clamping device is more suitable for clamping the samples to be transferred into a measuring device from a sample storage rack, and the measuring efficiency can be greatly improved; the concave pit is formed in the V-shaped groove of the clamping arm, the clamping block is arranged in the concave pit, and the spring is arranged between the clamping block and the clamping arm, so that a certain diameter error of a sample can be allowed, the size difference of the sample can be effectively compensated, when the sample is clamped, the spring is compressed, and each sample can be ensured to be clamped even if a plurality of samples are clamped.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of clamps for grabbing sample, especially a kind of clamp suitable for grabbing steel sample, belong to clamp technical field for testing machine. BACKGROUND

[0002] In building structural materials, steel bar is an important component, and the performance of steel bar directly affects the suitability and safety of the structure. Therefore, the quality requirement of steel bar is very high, and the necessary performance detection needs to be carried out before steel bar is used for engineering construction. For example, CN 117705589 A discloses an invention patent application entitled "Method for detecting test piece by intelligent detection system for steel bar tensile test" submitted by the applicant. The technical solution adopts a robot to replace manual clamping of the sample, and then sends the sample to a test piece measuring device. After measurement, the sample can be sent to a test station of the testing machine, and the sample waste after testing can be clamped from the test station and sent to a sample waste recycling device. The whole testing process does not require manual intervention, and the clamping, measurement, sending to the testing machine for detection and collection of test waste can be realized automatically, with low labor intensity of the tester and high overall testing efficiency of the testing machine. The whole testing process is assisted by the test piece clamp of the robot working end to grab the sample, but the existing test piece clamp generally sets a V-shaped opening on the clamping plate to facilitate clamping of circular samples such as steel bars. The clamping effect of this structure is not ideal when clamping threaded steel samples. Threaded steel is a steel bar with ribs on the surface, also known as ribbed steel bar, usually with 2 longitudinal ribs and transverse ribs evenly distributed along the length direction. The transverse ribs have a spiral shape, a herringbone shape or a crescent shape. Because the threaded steel has longitudinal ribs and transverse ribs on the outside, the contact area is small, so the sample cannot be clamped stably, and the sample is easy to tilt. When the test piece clamp grabs the sample and moves between test procedures, the sample is easy to slip or even fall, which causes trouble in testing. When the sample is tilted, the measurement is not accurate, the test cannot be correctly sent to the clamping jaw of the testing machine, manual intervention is required, and the testing efficiency is reduced. SUMMARY

[0003] The utility model aims at overcoming the defects of prior art, and provides a steel sample clamp to solve the problems in the background art.

[0004] The utility model discloses the technical scheme adopted for realizing the above-mentioned purposes is:

[0005] A steel sample clamp, comprising a connecting disc connectable with a wrist of a robot, a parallel pneumatic finger cylinder mounted on the connecting disc, an upper clamp seat and a lower clamp seat respectively connected to two parallel clamping jaws of the pneumatic finger cylinder, an upper clamping arm and a lower clamping arm respectively connected to the upper clamp seat and the lower clamp seat, and the pneumatic finger cylinder driving the two parallel clamping jaws to move towards or away from each other to drive the upper clamping arm and the lower clamping arm to clamp or release a sample.

[0006] In the steel sample clamp, rear ends of the upper clamping arm and the lower clamping arm are connecting ends, and front ends thereof are working ends, the connecting ends are connected to the parallel clamping jaws, the working end of the upper clamping arm and the working end of the lower clamping arm are symmetrically provided with V-shaped grooves on a side facing each other, and a rectangular groove is arranged at the bottom of the V-shaped groove.

[0007] By adopting the above technical solution, the V-shaped grooves are symmetrically arranged on the side of the working end of the upper clamping arm and the working end of the lower clamping arm facing each other, which is suitable for clamping a sample with a circular cross section, the V-shaped grooves play a positioning role, and when the V-shaped grooves contact the sample during clamping, the sample is limited, so that the sample gradually moves to the middle of the upper clamping arm and the lower clamping arm, thereby ensuring coaxiality; the rectangular groove arranged at the bottom of the V-shaped groove is more suitable for clamping a threaded steel sample, and the rectangular groove can accommodate longitudinal ribs on the threaded steel sample, so that the sample is clamped more firmly.

[0008] Further, the upper clamping arm comprises a left upper clamping arm and a right upper clamping arm, the lower clamping arm comprises a left lower clamping arm and a right lower clamping arm, and the left upper clamping arm, the right upper clamping arm, the left lower clamping arm and the right lower clamping arm are all provided with three V-shaped grooves, so that three samples can be clamped at the same time.

[0009] By adopting the above technical solution, the left upper clamping arm, the right upper clamping arm, the left lower clamping arm and the right lower clamping arm are all provided with three V-shaped grooves, so that three samples can be clamped at the same time, which is more suitable for clamping the samples from a sample storage rack into a measuring device, measuring the weight and size of the samples before testing, and greatly improving the measuring efficiency.

[0010] In the steel sample clamp, a recess is arranged in the V-shaped groove, a clamping block is arranged in the recess, the shape of the upper surface of the clamping block is adapted to the two side surfaces of the V-shaped groove and the rectangular groove, and a compression spring is arranged between the clamping block and the bottom of the recess.

[0011] Further, the side surface of the clamping block is adapted to the side wall surface of the recess, the lower surface of the clamping block is provided with a guide rod, the end of the guide rod is provided with a clamping groove, the bottom of the recess is provided with a through hole, the compression spring is sleeved on the guide rod, the end of the guide rod extends out through the through hole, and the elastic retaining ring for shaft is clamped into the clamping groove.

[0012] By adopting the technical scheme, the recess is arranged in the V-shaped groove, and the clamping block is arranged in the recess, so that the threaded steel sample is more conveniently clamped, especially when the three V-shaped grooves on the clamping arm clamp the sample at the same time, although the bottom of the V-shaped groove is provided with the rectangular groove which can accommodate the longitudinal rib on the threaded steel sample, the threaded steel sample also has a transverse rib, so that the contact area is small and the sample cannot be stably clamped, and if the sizes of the samples in the three V-shaped grooves are slightly different, the thinnest sample will not be clamped firmly, which leads to slipping or even falling. After the clamping block is arranged, the difference in the sizes of the samples can be effectively compensated, and when the sample is clamped, the spring is compressed, so that each sample can be clamped tightly. By adjusting the pre-tightening force of the compression spring, the clamping force can also be adjusted, which is beneficial to accurately clamping the sample and preventing the sample from moving when clamping. Advantageous effects

[0013] 1. Suitable for clamping a round sample, especially a threaded steel sample;

[0014] 2. Three samples can be clamped at the same time, which is more suitable for clamping the sample from the sample storage rack into the measuring device, measuring the weight and size of the sample before testing, and can greatly improve the measuring efficiency;

[0015] 3. The recess is arranged in the V-shaped groove of the clamping arm, the clamping block is arranged in the recess, and the spring is arranged between the clamping block and the clamping arm, which can allow the sample to have a certain diameter error, can effectively compensate for the difference in the size of the sample, and when the sample is clamped, the spring is compressed, so that each sample can be clamped tightly even if multiple samples are clamped. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a front side schematic view of the present application.

[0017] Fig. 2 is a rear side schematic view of the present application.

[0018] Fig. 3 is an exploded schematic view of the clamping block in the present application.

[0019] In the figure: 1 connecting disc, 2 finger air cylinder, 3 clamping jaw, 4 upper clamp base, 5 left upper clamping arm, 6 left lower clamping arm, 7 right upper clamping arm, 8 clamping block, 9 guide rod, 10 compression spring, 11 recess, 12 shaft elastic retainer, 13 right lower clamping arm, 14 V-shaped groove, 15 rectangular groove, 16 lower clamp base. DETAILED DESCRIPTION

[0020] In order to clearly illustrate the technical features of the present application, the present application will be further described below in conjunction with the drawings.

[0021] The front, rear, left and right directions are described according to the front, rear, left and right directions shown in the drawings.

[0022] Please refer to Fig. 1 to Figure 3 A steel sample clamp, a parallel pneumatic finger cylinder 2 is installed on the connecting disc 1, in this embodiment, AF30A-90 type gas claw produced by JRT of South Korea is adopted, the connecting disc 1 is in the form of a flange plate, a plurality of bolt holes are formed on the connecting disc 1, and one end of the connecting disc 1 is fixedly connected with the wrist of the robot through bolts; the parallel pneumatic finger cylinder 2 is installed on the other end of the connecting disc 1; the two parallel clamping jaws of the parallel pneumatic finger cylinder 2 are respectively connected with an upper clamp seat 4 and a lower clamp seat 16, the upper clamp seat 4 and the lower clamp seat 16 are respectively connected with an upper clamping arm and a lower clamping arm, the pneumatic finger cylinder 2 drives the two parallel clamping jaws 3 to move towards each other or move away from each other, and drives the upper clamping arm and the lower clamping arm to clamp or release the sample.

[0023] Specifically, the rear end of the upper clamping arm and the lower clamping arm is a connecting end, and the front end is a working end, the connecting end is connected with the parallel clamping jaw 3 in a conventional connection mode such as a bolt and a pin; in this embodiment, V-shaped grooves 14 are symmetrically arranged on the side of the working end of the upper clamping arm and the working end of the lower clamping arm; and a rectangular groove 15 is arranged at the bottom of the V-shaped groove 14.

[0024] The upper clamping arm specifically includes a left upper clamping arm 5 and a right upper clamping arm 7, and the lower clamping arm specifically includes a left lower clamping arm 6 and a right lower clamping arm 13; and the left upper clamping arm 5, the right upper clamping arm 7, the left lower clamping arm 6 and the right lower clamping arm 13 are all provided with three V-shaped grooves 14, so that three samples can be clamped at the same time.

[0025] The V-shaped groove 14 is provided with a recess, the recess 11 is provided with a clamping block 8, the upper surface of the clamping block 8 is matched with the two side surfaces of the V-shaped groove 14 and the rectangular groove 15; and a compression spring 10 is arranged between the clamping block 8 and the bottom of the recess 11.

[0026] The side surface of the clamping block 8 is matched with the side wall surface of the recess 11, the lower surface of the clamping block 8 is provided with a guide rod 9, and the end of the guide rod 9 is provided with a clamping groove; the bottom of the recess 11 is provided with a through hole, the guide rod 9 is sleeved with the compression spring 10, the end of the guide rod 9 extends out through the through hole, and the elastic retaining ring 12 for shaft is clamped in the clamping groove.

[0027] In this embodiment, the parallel pneumatic finger cylinder 2 adopts the AF30A-90 type pneumatic claw with a stroke of 50mm produced by JRT of South Korea, the parallel pneumatic finger cylinder 2 is connected with the air source through the electromagnetic valve and the air pipe, the PLC controller is electrically connected with the electromagnetic valve of the parallel pneumatic finger cylinder 2, the electromagnetic valve is controlled to be opened or closed, thereby controlling the parallel pneumatic finger cylinder 2, and the parallel pneumatic finger cylinder 2 clamps or releases the test piece during work.

[0028] In this embodiment, the control system uses a PLC control system.

[0029] The working process of this embodiment is as follows:

[0030] (1) the sample clamp is connected with the wrist of the robot through the connecting disc 1, and the piston rod of the parallel pneumatic finger cylinder 2 is in the extended state;

[0031] (2) the test sample is regularly placed on the sample rack according to requirements;

[0032] (3) the robot drives the sample clamp to move to the front of the sample rack, and then moves forward according to the instruction of the control system, so that the test sample to be grabbed is located between the upper clamping arm and the lower clamping arm;

[0033] (4) the control system controls the piston rod of the parallel pneumatic finger cylinder 2 to retract, so as to drive the upper clamping arm and the lower clamping arm to approach each other; the sample contacts the clamping blocks 8 on the upper clamping arm and the lower clamping arm, and the spring is gradually compressed to clamp the sample;

[0034] (5) the robot drives the sample clamp to leave the sample rack and move to the measuring station of the test piece measuring device or the test station of the testing machine;

[0035] (6) the control system controls the piston rod of the parallel pneumatic finger cylinder 2 to extend, so as to drive the upper clamping arm and the lower clamping arm to separate away from each other and release the sample;

[0036] (7) the robot drives the sample clamp to return to the original position;

[0037] (8) steps (3)-(7) are repeated to grab the next group of samples.

[0038] In the description of the utility model, it should be explained that the terms "left", "right", "front", "back", "up", "down", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and the above terms are only for the convenience of describing the utility model and simplifying the description, and are not intended to indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0039] Unless otherwise defined and limited, the terms "installation", "connected", "connection" shall be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In addition to the technical features described in the specification, they are known to those skilled in the art.

[0041] The above-mentioned embodiments are only used for understanding the present application, and are not limited to the technical solutions described in the present application. Those skilled in the art can make various changes or modifications on the basis of the technical solutions described in the claims, and all equivalent changes or modifications shall be covered within the protection scope of the claims of the present application.

Claims

1. A steel wire sample gripper comprising a connection plate connectable to a wrist of a robot, characterized in that: Parallel pneumatic finger cylinders are installed on the connecting plate, the upper clamp seat and the lower clamp seat are respectively connected to the two parallel clamping jaws of the pneumatic finger cylinders, the upper clamping arm and the lower clamping arm are respectively connected to the upper clamp seat and the lower clamp seat, and the pneumatic finger cylinders drive the two parallel clamping jaws to move towards each other or away from each other, thereby driving the upper clamping arm and the lower clamping arm to clamp or release the sample.

2. A steel sample holder as claimed in claim 1, characterized in that: The rear end of the upper clamping arm and the lower clamping arm is a connecting end, and the front end is a working end; the connecting end is connected to the parallel clamping jaw; V-shaped grooves are symmetrically arranged on the side of the working end of the upper clamping arm and the working end of the lower clamping arm facing each other; and a rectangular groove is arranged at the bottom of the V-shaped groove.

3. A steel sample holder as claimed in claim 2, characterized in that: The upper clamping arm includes a left upper clamping arm and a right upper clamping arm, and the lower clamping arm includes a left lower clamping arm and a right lower clamping arm; three V-shaped grooves are arranged on the left upper clamping arm, the right upper clamping arm, the left lower clamping arm and the right lower clamping arm, and three samples can be clamped at the same time.

4. A steel sample holder according to claim 2 or 3, characterized in that: A recess is arranged in the V-shaped groove, a clamping block is arranged in the recess, the upper surface of the clamping block is adapted to the two side surfaces of the V-shaped groove and the rectangular groove; and a compression spring is arranged between the clamping block and the bottom of the recess.

5. A steel sample holder as claimed in claim 4, characterized in that: The side surface of the clamping block is adapted to the side wall surface of the recess, a guide rod is arranged on the lower surface of the clamping block, a clamping groove is arranged at the end of the guide rod, a through hole is arranged at the bottom of the recess, the guide rod is sleeved with a compression spring, the end of the guide rod protrudes through the through hole, and a shaft elastic stop washer is clamped in the clamping groove.

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