Calibration clamp for universal testing machine

Abstract

The utility model relates to the technical field of calibration fixtures for testing machines, in particular to a calibration fixture for a universal testing machine. The calibration clamp for the universal testing machine comprises a machine base and supporting columns arranged on the two sides of the top end of the machine base, a cross beam is fixedly installed at the top ends of the supporting columns, lead screws are installed on the two sides of the bottom end of the cross beam, a lifting plate is jointly installed on the two lead screws, and a load sensor is fixedly installed in the middle of the cross beam; the number of the quick sockets is two, the two quick sockets are oppositely installed in the middle of the lifting plate and the bottom end of the load sensor respectively, chucks are inserted into the quick sockets, dovetail countersunk grooves are formed in the chucks, clamping pieces are installed in the dovetail countersunk grooves, and each clamping piece comprises a pull rod installed in a through hole formed in the corresponding chuck in a sliding mode; a plurality of tooth grooves are formed in one side of the pull rod, a mounting groove is formed in one side of the chuck, and a driving piece is mounted in the mounting groove. The calibration clamp for the universal testing machine has the advantages of being stable and reliable in clamping and convenient to clamp.

Description

Technical Field

[0001] The utility model relates to the technical field of testing machine calibration fixtures, in particular to a calibration fixture for a universal testing machine. Background Art

[0002] The universal testing machine is an important equipment for testing the mechanical properties of materials. It can perform various mechanical tests such as tension, compression, bending, and shear. When using a universal testing machine for mechanical experiments, it is necessary to use a fixture to clamp the sample. Due to the diversity of samples, when changing different fixtures for clamping, calibration is required for more accurate measurement.

[0003] The current publication number CN 213209810 U discloses a universal testing machine calibration fixture, comprising a machine base, a fixing part and a fixture, wherein the fixture is fixed to the machine base by the fixing part, the machine base is composed of a base and a support rod, tracks are symmetrically provided on both side walls of the support rod, a slider is sleeved on the upper end of the support rod, a fixing clamp is installed near the side wall of the base of the slider, a load sensor is clamped on the fixing clamp, two groups of fixing parts are respectively arranged oppositely on the lower surface of the load sensor and the upper surface of the base, a wedge block is provided in the dovetail groove, the outer side walls of the two wedge blocks are fixedly connected to the outer side wall of the chuck by a locking block, a tension block is provided at the lower end of the corresponding surface of the two wedge blocks, and the lower surface of the tension block is fixedly connected to the bottom of the dovetail groove by a spring; the utility model has an ingenious structure, can quickly complete the clamping and disassembly of the workpiece, greatly shortens the test time, and can complete the calibration by simply aligning the tension block, saving a lot of manpower and material resources and improving work efficiency. When it is used, it only uses a spring to pull the tension block to drive the wedge block to clamp the sample. This clamping is not firm, and the sample is easy to fall off during stretching, affecting the normal test.

[0004] Therefore, it is necessary to provide a calibration fixture for a universal testing machine to solve the above technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a calibration fixture for a universal testing machine.

[0006] The utility model provides a calibration fixture for a universal testing machine, comprising: a machine base, and support columns arranged on both sides of the top of the machine base, a crossbeam fixedly mounted on the top of the support column, screws mounted on both sides of the bottom end of the crossbeam, a lifting plate mounted on both the screws, and a load sensor fixedly mounted in the middle of the crossbeam;

[0007] There are two groups of quick sockets, and the two groups of quick sockets are respectively installed in opposition at the middle part of the lifting plate and the bottom end of the load sensor, and a chuck is inserted on the quick socket, and a dovetail groove is provided on the chuck, and a clamping member is installed in the dovetail groove. The clamping member includes a pull rod slidably installed in the through hole opened in the chuck, and a limit plate is fixedly installed at one end of the pull rod extending into the dovetail groove. Two groups of wedge blocks are symmetrically arranged in the dovetail groove, and the ends of the two groups of wedge blocks are provided with grooves that engage with the limit plate. One side of the pull rod is provided with a plurality of tooth grooves, and one side of the chuck is provided with an installation groove, and a driving member connected to the pull rod for transmission is installed in the installation groove.

[0008] Preferably, the chuck is provided with a plug-in rod for plugging with the quick socket, a pin hole is provided in the middle of the plug-in rod, and a fixing pin for plugging with the pin hole is installed in the middle of the quick socket.

[0009] Preferably, a synchronous motor for driving the screw to rotate is installed on the crossbeam, which is used to drive the lifting plate to reciprocate along the screw.

[0010] Preferably, the chuck is symmetrically mounted with limit blocks located in the dovetail groove for limiting the two groups of wedge blocks in the dovetail groove.

[0011] Preferably, two groups of limiting grooves are symmetrically opened in the dovetail sink, and the two groups of wedge blocks are fixedly installed with limiting rods that slide with the corresponding limiting grooves, and the two groups of limiting grooves are arranged parallel to the corresponding dovetail sink side walls.

[0012] Preferably, the clamping surfaces of the two groups of wedge blocks are provided with V-shaped grooves, and anti-slip teeth are arranged in the V-shaped grooves, and the clamping surface of one group of wedge blocks is provided with a supporting step.

[0013] Preferably, the driving member includes a mounting seat, and the mounting seat is provided with two groups. The two groups of mounting seats are mounted on the chuck, and a support shaft is rotatably installed between the two groups of mounting seats, and a transmission block is fixedly installed on the support shaft between the two groups of mounting seats, and the transmission block is provided with a key tooth portion engaged with the tooth groove, and the end of the support shaft extending into the mounting groove is fixedly sleeved with a worm gear, and an adjusting rod is rotatably installed in the mounting groove, and a worm is fixedly sleeved on the part of the adjusting rod close to the worm gear, and the worm is engaged with the worm gear, and a handwheel is fixedly installed on one end of the adjusting rod.

[0014] Compared with the related art, the calibration fixture for the universal testing machine provided by the utility model has the following beneficial effects:

[0015] 1. The utility model provides a calibration fixture for a universal testing machine. A tooth groove is provided on the pull rod. By using the mounting seat, support shaft, transmission block, key tooth portion, worm gear, adjustment rod, worm and hand wheel of the driving member, the wedge block can be driven to slide along the dovetail groove, thereby stably clamping the sample.

[0016] 2. The wedge block is provided with a limit rod for sliding fit in the limit groove, which can further improve the mobile clamping stability of the wedge block, and a V-groove and a support step are provided on the clamping surface to facilitate rapid clamping of different samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a preferred embodiment of a calibration fixture for a universal testing machine provided by the present invention;

[0018] Figure 2 A schematic diagram of the structure of a quick socket provided by the utility model with a chuck installed;

[0019] Figure 3 A schematic structural diagram of a quick socket provided by the present invention with a chuck installed from another perspective;

[0020] Figure 4 A schematic diagram of the structure of a quick socket installed on the load sensor provided by the utility model;

[0021] Figure 5 This is a schematic diagram of the exploded structure of the chuck, clamping member and driving member provided by the utility model.

[0022] Numbers in the figure: 1. Machine base; 11. Support column; 2. Crossbeam; 21. Synchronous motor; 3. Screw; 4. Lifting plate; 5. Load sensor; 6. Quick socket; 61. Fixing pin; 7. Chuck; 71. Insert rod; 701. Dovetail groove; 702. Mounting groove; 703. Limiting groove; 8. Clamping piece; 81. Pull rod; 82. Limiting plate; 83. Wedge block; 831. Limiting rod; 832. Support step; 84. Limiting block; 801. Tooth groove; 802. Groove; 803. V-groove; 9. Driving piece; 91. Mounting seat; 92. Support shaft; 93. Transmission block; 931. Key tooth portion; 94. Worm gear; 95. Adjusting rod; 96. Worm; 97. Handwheel. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0025] See also Figures 1 to 5 The present invention provides a calibration fixture for a universal testing machine, which comprises:

[0026] A machine base 1, and support columns 11 provided on both sides of the top of the machine base 1, a crossbeam 2 fixedly mounted on the top of the support column 11, screws 3 installed on both sides of the bottom end of the crossbeam 2, a lifting plate 4 installed on both the screws 3, and a load sensor 5 fixedly mounted in the middle of the crossbeam 2;

[0027] The quick socket 6 is provided with two groups. The two groups of quick sockets 6 are respectively installed in the middle of the lifting plate 4 and the bottom end of the load sensor 5 in opposition, and a chuck 7 is inserted into the quick socket 6. The chuck 7 is provided with a dovetail groove 701. A clamping member 8 is installed in the dovetail groove 701. The clamping member 8 includes a pull rod 81 slidably installed in the through hole opened in the chuck 7. One end of the pull rod 81 extends into the dovetail groove 701 and is fixedly installed with a limit plate 82. Two groups of wedge blocks 83 are symmetrically provided in the dovetail groove 701. The ends of the two groups of wedge blocks 83 are provided with grooves 802 that engage with the limit plate 82. One side of the pull rod 81 is provided with a plurality of tooth grooves 801. One side of the chuck 7 is provided with a mounting groove 702. The mounting groove 70 2 is equipped with a driving member 9 that is transmission-connected to the pull rod 81, and the driving member 9 includes a mounting seat 91, and the mounting seat 91 is provided with two groups. The two groups of mounting seats 91 are installed on the chuck 7, and a support shaft 92 is rotatably installed between the two groups of mounting seats 91. A transmission block 93 is fixedly installed on the support shaft 92 between the two groups of mounting seats 91. The transmission block 93 is provided with a key tooth portion 931 that engages with the tooth groove 801. One end of the support shaft 92 extending into the mounting groove 702 is fixedly sleeved with a worm gear 94, and an adjusting rod 95 is rotatably installed in the mounting groove 702. A worm 96 is fixedly sleeved on the adjusting rod 95 near the worm gear 94, and the worm 96 engages with the worm gear 94, and a handwheel 97 is fixedly installed on one end of the adjusting rod 95.

[0028] Among them, the clamping head 7 is symmetrically installed with limiting blocks 84 located in the dovetail groove 701 for limiting the two groups of wedge blocks 83 in the dovetail groove 701.

[0029] It should be noted that: during use, when it is necessary to test the clamped sample, the clamping end of the sample is placed between the two wedge blocks 83, and then the handwheel 97 is turned to drive the adjusting rod 95 to drive the worm 96 to rotate synchronously. The worm 96 is engaged with the worm wheel 94, thereby driving the support shaft 92 to drive the transmission block 93 to rotate. When the transmission block 93 rotates, the key tooth portion 931 is engaged with the tooth groove 801, thereby driving the pull rod 81 to push the dovetail groove 701 upward. When pushing out, under the push of the dovetail groove 701, the two groups of wedge blocks 83 approach each other until the sample is clamped. In this way, the self-locking property of the worm 96 and the worm wheel 94 can make the wedge block 83 very firm and stable when clamping the sample, which is convenient for mechanical testing. When the sample needs to be removed after the test, it is only necessary to reverse the handwheel 97.

[0030] In the embodiments of the present invention, please refer to Figure 1 Hezhi Figure 5 The chuck 7 is provided with a plug-in rod 71 for plugging with the quick socket 6. A pin hole is provided in the middle of the plug-in rod 71. A fixing pin 61 is installed in the middle of the quick socket 6 to cooperate with the pin hole.

[0031] It should be noted that when the chuck 7 and the quick socket 6 are docked and installed, the chuck 7 can be inserted into the quick socket 6 using the insertion rod 71 and then pinned using the fixing pin 61, which makes assembly and disassembly very convenient.

[0032] In the embodiments of the present invention, please refer to Figure 1 Hezhi Figure 5 , a synchronous motor 21 for driving the screw 3 to rotate is installed on the crossbeam 2, which is used to drive the lifting plate 4 to reciprocate along the screw 3;

[0033] It should be noted that after the synchronous motor 21 is connected to the control system of the testing machine, the synchronous motor 21 is controlled to drive the two sets of screws 3 to rotate synchronously, thereby driving the lifting plate 4 to slide up and down along the screws 3, thereby performing a tensile test or an extrusion test.

[0034] In the embodiments of the present invention, please refer to Figure 1 Hezhi Figure 5 , two groups of limiting grooves 703 are symmetrically opened in the dovetail sink groove 701, and the two groups of wedge blocks 83 are fixedly installed with limiting rods 831 that slide with the corresponding limiting grooves 703, and the two groups of limiting grooves 703 are arranged parallel to the side walls of the corresponding dovetail sink groove 701;

[0035] It should be noted that when the wedge block 83 is pushed by the pull rod 81 to move along the dovetail groove 701, the cooperation between the limiting rod 831 and the limiting groove 703 can make the movement of the wedge block 83 more stable.

[0036] In this embodiment, the clamping surfaces of the two groups of wedge blocks 83 are provided with V-shaped grooves 803, and anti-slip teeth are arranged in the V-shaped grooves 803. The clamping surface of one group of wedge blocks 83 is provided with support steps 832. The V-shaped grooves 803 are used to facilitate clamping of cylindrical samples, and the support steps 832 can be used to clamp long strip samples, thereby improving the clamping diversity of the wedge blocks 83.

[0037] The working principle of the calibration fixture for the universal testing machine provided by the utility model is as follows:

[0038] When in use, when it is necessary to test the clamped sample, the clamping end of the sample is placed between the two wedge blocks 83, and then the hand wheel 97 is turned to drive the adjusting rod 95 to drive the worm 96 to rotate synchronously. The worm 96 is meshed with the worm gear 94, thereby driving the support shaft 92 to drive the transmission block 93 to rotate. When the transmission block 93 rotates, the key tooth portion 931 is engaged with the tooth groove 801, thereby driving the pull rod 81 to push the dovetail groove 701 upward. When pushing out, the two sets of wedge blocks 83 are pushed closer to each other until the sample is clamped. In this way, the self-locking property of the worm 96 and the worm gear 94 can make the wedge block 83 very firm and stable when clamping the sample, which is convenient for mechanical testing. When the sample needs to be removed after the test, it is only necessary to reverse the hand wheel 97.

[0039] Furthermore, when the wedge block 83 is pushed by the pull rod 81 to move along the dovetail groove 701, the cooperation between the limit rod 831 and the limit groove 703 can make the movement of the wedge block 83 more stable. The wedge block 83 uses the V-groove 803 to facilitate clamping of cylindrical samples, and uses the support step 832 to clamp long strip samples, thereby improving the clamping diversity of the wedge block 83.

[0040] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0041] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A calibration fixture for a universal testing machine, comprising: A machine base (1), and support columns (11) arranged on both sides of the top of the machine base (1), a crossbeam (2) being fixedly mounted on the top of the support column (11), screws (3) being mounted on both sides of the bottom of the crossbeam (2), a lifting plate (4) being mounted on both of the screws (3), and a load sensor (5) being fixedly mounted on the middle of the crossbeam (2); It is characterized by further comprising: The quick socket (6) is provided with two groups, and the two groups of quick sockets (6) are respectively installed in the middle of the lifting plate (4) and the bottom end of the load sensor (5), and the quick socket (6) is inserted with a chuck (7), the chuck (7) is provided with a dovetail groove (701), and a clamping member (8) is installed in the dovetail groove (701), and the clamping member (8) includes a pull rod (81) slidably installed in the through hole provided in the chuck (7), and the pull rod (81) extends into the dovetail groove. A limit plate (82) is fixedly installed at one end of (701), and two groups of wedge blocks (83) are symmetrically arranged in the dovetail groove (701). The ends of the two groups of wedge blocks (83) are provided with grooves (802) that engage with the limit plate (82). One side of the pull rod (81) is provided with a plurality of tooth grooves (801), and one side of the chuck (7) is provided with a mounting groove (702), and a driving member (9) that is transmission-connected to the pull rod (81) is installed in the mounting groove (702).

2. The calibration fixture for a universal testing machine according to claim 1, characterized in that: The chuck (7) is provided with a plug-in rod (71) for plugging with the quick socket (6), a pin hole is provided in the middle of the plug-in rod (71), and a fixing pin (61) for plugging with the pin hole is installed in the middle of the quick socket (6).

3. The calibration fixture for a universal testing machine according to claim 1, characterized in that: A synchronous motor (21) for driving the lead screw (3) to rotate is mounted on the crossbeam (2) and is used to drive the lifting plate (4) to reciprocate along the lead screw (3).

4. The calibration fixture for a universal testing machine according to claim 1, characterized in that: The clamping head (7) is symmetrically mounted with stop blocks (84) located in the dovetail groove (701) for stopping the two groups of wedge blocks (83) in the dovetail groove (701).

5. The calibration fixture for a universal testing machine according to claim 4, characterized in that: Two groups of limiting grooves (703) are symmetrically provided in the dovetail groove (701), and the two groups of wedge blocks (83) are fixedly installed with limiting rods (831) that are slidably matched with the corresponding limiting grooves (703), and the two groups of limiting grooves (703) are arranged parallel to the side walls of the corresponding dovetail groove (701).

6. The calibration fixture for a universal testing machine according to claim 1, characterized in that: The clamping surfaces of the two groups of wedge blocks (83) are provided with V-shaped grooves (803), and anti-slip teeth are provided in the V-shaped grooves (803). The clamping surface of one group of wedge blocks (83) is provided with a supporting step (832).

7. The calibration fixture for a universal testing machine according to claim 1, characterized in that: The driving member (9) includes a mounting seat (91), and the mounting seat (91) is provided with two groups. The two groups of mounting seats (91) are mounted on the chuck (7), and a support shaft (92) is rotatably installed between the two groups of mounting seats (91). A transmission block (93) is fixedly installed on the support shaft (92) between the two groups of mounting seats (91). The transmission block (93) is provided with a key tooth portion (931) engaged with the tooth groove (801). One end of the support shaft (92) extending into the mounting groove (702) is fixedly provided with a worm gear (94). An adjusting rod (95) is rotatably installed in the mounting groove (702). A worm (96) is fixedly provided on the portion of the adjusting rod (95) close to the worm gear (94). The worm gear (96) is engaged with the worm gear (94), and a hand wheel (97) is fixedly installed on one end of the adjusting rod (95).

Images