A screw head wear tester for plastic extrusion equipment

Abstract

The present invention relates to the technical field of wear-resistant testing equipment, and discloses a screw head wear-resistant testing machine for plastic extrusion equipment, including a main body and a friction station arranged on the main body, wherein a cavity corresponding to the position of the friction station is arranged in the main body, a transverse motor is installed on the side wall of the friction station, and a friction pair is fixed to the output shaft of the transverse motor. The present invention is provided with an electric chuck, a friction pair and a driving component, wherein the driving component first drives the screw head fixed on the electric chuck to move downward to contact the friction pair, thereby first performing a friction test on the cylindrical outer wall on the screw head, and then the driving component drives the screw head to swing first and then move again to contact the friction pair, thereby performing a friction test on the conical outer wall on the screw head, which is conducive to sequentially testing the wear resistance of two different positions on the screw head, and can not only adapt to special-shaped workpieces such as screw heads, but also adapt to workpieces of common shapes, with high testing efficiency, precise measurement and high degree of automation.

Description

Technical Field

[0001] The invention relates to the technical field of wear-resistant testing equipment, in particular to a screw head wear-resistant testing machine for plastic extrusion equipment. Background Art

[0002] Generally, the wear resistance test of metal materials is mainly carried out by friction and wear testing machines. The parts are fixed on the fixture and contacted with the rotating friction pair with a certain load. Then, after friction, the wear condition is recorded and the weight of the parts before and after friction is weighed to determine the wear amount, so as to determine the wear resistance. However, the existing equipment still has certain shortcomings: the current testing machines generally test block workpieces or tubular workpieces with regular shapes, but as shown in the attached figure, Figure 2 The screw head of a type of extrusion equipment described in the specification has a thin cylindrical part, a thick cylindrical part and a conical part, and the outer wall is also provided with a diversion groove. For this special-shaped workpiece, the surfaces that need to be measured include the outer wall of the cylindrical part and the outer wall of the conical part. The existing equipment is not convenient for performing efficient wear resistance testing on the two surfaces of this type of screw head. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a screw head wear resistance testing machine for plastic extrusion equipment, which has the advantages of efficient measurement and high degree of automation, and solves the problem that the existing friction testing machines are inconvenient to perform friction experiments on special-shaped workpieces with multiple measuring surfaces such as screw heads.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a screw head wear tester for plastic extrusion equipment, comprising a main body and a friction station arranged on the main body, wherein a cavity corresponding to the position of the friction station is arranged in the main body, a transverse motor is installed on the side wall of the friction station, a friction pair is fixed on the output shaft of the transverse motor, and an electric chuck for clamping a workpiece is arranged above the friction pair;

[0005] A driving assembly is provided on the bottom wall of the friction station, and the driving assembly is used to drive the electric chuck to move vertically and swing;

[0006] A transmission assembly is arranged inside the cavity, the transmission assembly is in transmission connection with the driving assembly, and the driving assembly is also used to drive the transmission assembly, thereby driving the transverse motor and the friction pair to move;

[0007] During the wear resistance test, the electric chuck operates to clamp the workpiece, the transverse motor operates to drive the friction pair to rotate, and the drive assembly operates initially to drive the electric chuck and the workpiece downward, forcing the cylindrical part of the workpiece to contact the friction pair, and then test the cylindrical part of the workpiece. After the test is completed, the drive assembly drives the electric chuck and the workpiece to move up and reset, and also drives the transmission assembly to operate, forcing the transverse motor and the friction pair to move laterally. Then the drive assembly operates again, first driving the electric chuck and the workpiece to swing, and then driving the electric chuck and the workpiece downward, forcing the conical part on the workpiece to contact the friction pair, and then testing the conical part on the workpiece.

[0008] Preferably, the driving assembly includes a movable plate located above the electric chuck and a vertical cylinder fixedly installed in the cavity, the output end of the vertical cylinder passes through the bottom wall of the friction station and is fixedly connected to the movable plate, a pressure sensor is fixed to the bottom of the movable plate, the bottom of the pressure sensor is fixedly connected to an assembly frame, and the electric chuck is installed on the inner side of the assembly frame.

[0009] Preferably, the electric chuck is rotatably connected to the outside with a collar, base shafts are fixed on both sides of the collar, the two base shafts are rotatably connected to the two sides of the assembly frame respectively, a worm wheel is fixed to the end of one of the base shafts, a worm is meshingly connected to the edge of the worm wheel, bearing seats are installed at both ends of the worm, the two bearing seats are fixedly connected to the assembly frame, a first motor is fixed on one of the bearing seats, and the output shaft of the first motor is fixedly connected to the end of the worm.

[0010] Preferably, the transmission assembly includes a screw, a guide rod and a rotating shaft arranged inside the cavity, the screw, guide rod and rotating shaft are distributed in parallel, both ends of the screw are rotatably connected to the inner wall of the cavity, a nut seat is threadedly connected to the worm, the nut seat is fixedly connected to the transverse motor, the guide rod and the nut seat are movably plugged into, both ends of the guide rod are fixedly connected to the inner wall of the cavity, the rotating shaft is arranged directly above the screw and one end is rotatably connected to the inner wall of the cavity, a driven synchronous wheel is fixed on the screw, an active synchronous wheel and a driving gear are fixed on the rotating shaft, the active synchronous wheel is connected to the driven synchronous wheel through a synchronous belt, a vertically arranged driving rack is meshed on one side of the driving gear, the driving rack is vertically slidably connected to the inner wall of the cavity, and a cross bar is fixedly arranged at the bottom end of the driving rack.

[0011] Preferably, a strip-shaped through slot communicating with the interior of the cavity is formed on the side wall of the friction station, and an extension rod is fixedly connected to the edge of the movable plate, and the extension rod passes through the strip-shaped through slot and extends to the bottom of the cross bar.

[0012] Preferably, a driven gear is fixedly sleeved outside the electric chuck, a sleeve is fixed to the outer wall of the sleeve, a second motor is fixed to one side of the sleeve, a movable shaft is fixed to the output shaft of the second motor, the movable shaft is rotatably connected to the sleeve, a driving gear is fixed to one end of the movable shaft, and the driving gear is meshed with the driven gear.

[0013] Preferably, a mounting frame is fixedly connected to the bottom wall of the friction station, an infrared sensor is mounted on the mounting frame, the infrared sensor is distributed parallel to the friction pair, and the infrared sensor points to the top area of ​​the friction pair.

[0014] Preferably, a vertical strip-shaped through hole is opened on the mounting frame, and the infrared sensor passes through the strip-shaped through hole and is fixed to the mounting frame by a nut.

[0015] Preferably, a mounting hole and a slide groove are provided on the top of the extension rod, a lever is provided in the mounting hole, the middle part of the lever is rotatably connected to the inner wall of the mounting hole, a push rod is hinged on the top of the lever, a strip slider is hinged on one end of the push rod, the strip slider is slidably connected to the slide groove, and an L-shaped base block is fixed to one end of the strip slider.

[0016] Preferably, the bottom end of the lever corresponds to the center position of the electric chuck, and a weight block is fixedly connected to the bottom end of the lever.

[0017] Compared with the prior art, the present invention provides a screw head wear tester for plastic extrusion equipment, which has the following beneficial effects:

[0018] 1. This screw head wear tester for plastic extrusion equipment is equipped with an electric chuck, a friction pair and a drive assembly. The drive assembly first drives the screw head fixed on the electric chuck to move down to the contact friction pair, so as to first perform a friction test on the cylindrical outer wall on the screw head. Then the drive assembly drives the screw head to swing first and then move it back to the contact friction pair, and then perform a friction test on the conical outer wall on the screw head. It is beneficial to perform wear resistance tests on two different positions on the screw head in sequence, and can adapt not only to special-shaped workpieces such as screw heads, but also to workpieces of common shapes, with high test efficiency, accurate measurement and high degree of automation.

[0019] 2. This screw head wear tester for plastic extrusion equipment is conducive to adjusting the position of the friction pair between two tests by setting a transmission component, so that the contact position between the friction pair and the screw head is different, the initial friction resistance is the same, and the consistency of the test conditions is ensured. The experimental results are more stable and reliable, and the phenomenon that continuous testing at the same position on the friction pair causes changes in friction and thus affects the test results is avoided.

[0020] 3. This screw head wear tester for plastic extrusion equipment is equipped with an infrared sensor and a second motor. When the infrared sensor detects that the screw head is in the wrong position, it controls the operation of the second motor, and then adjusts the angle of the screw head so that only the effective test area of ​​the screw head contacts the friction pair. No manual adjustment is required, and the degree of automation is high.

[0021] 4. This screw head wear tester for plastic extrusion equipment is equipped with a lever, a push rod, a bar slider and an L-shaped base block. After two rounds of testing of a single screw head are completed, the gravity of the lever drives the L-shaped base block to move to the cross bar, and then the drive assembly is started to drive the transmission assembly to run in the reverse direction, which is beneficial to the movement and reset of the friction pair after the drive movement, and is beneficial to multiple repeated testing work. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of a screw head wear resistance testing machine for plastic extrusion equipment of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the screw head of the present invention;

[0024] Figure 3 A side cross-sectional view of the main body of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the driving assembly of the present invention;

[0026] Figure 5 For the present invention Figure 4 A magnified view of part A;

[0027] Figure 6 A rear cross-sectional view of the main body of the present invention;

[0028] Figure 7 For the present invention Figure 6 A magnified view of part B;

[0029] Figure 8 It is a structural schematic diagram of the transmission assembly of the present invention;

[0030] Fig. 9 It is a structural schematic diagram of the movable plate of the present invention;

[0031] Fig.10 For the present invention Fig. 9 Enlarged view of part C.

[0032] In the figure: 1, main body; 2, friction station; 21, strip-shaped through groove; 3, cavity; 4, horizontal motor; 5, friction pair; 6, electric chuck; 7, driving assembly; 701, movable plate; 702, vertical cylinder; 703, pressure sensor; 704, assembly frame; 705, collar; 706, base shaft; 707, worm gear; 708, worm; 709, bearing seat; 710, first motor; 711, extension rod; 712, driven gear; 713, sleeve; 714, second motor; 715, movable shaft; 716, driving gear; 717, mounting hole; 718, slide groove; 719, lever; 720, push rod; 721, strip slider; 722, L-shaped base block; 723, weight block; 8, transmission assembly; 801, screw rod; 802, guide rod; 803, rotating shaft; 804, nut seat; 805, driven synchronous wheel; 806, driving synchronous wheel; 807, driving gear; 808, synchronous belt; 809, driving rack; 810, cross bar; 9, mounting frame; 10, infrared sensor; 11, strip through hole. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the present application proposes a screw head wear tester for plastic extrusion equipment.

[0035] Example 1: Please refer to Figure 1 - Figure 3 , a screw head wear tester for plastic extrusion equipment, comprising a main body 1 and a friction station 2 arranged on the main body 1, wherein a cavity 3 corresponding to the position of the friction station 2 is arranged in the main body 1, a transverse motor 4 is installed on the side wall of the friction station 2, a friction pair 5 is fixed to the output shaft of the transverse motor 4, and an electric chuck 6 for clamping a workpiece is arranged above the friction pair 5;

[0036] The bottom wall of the friction station 2 is provided with a driving assembly 7, and the driving assembly 7 is used to drive the electric chuck 6 to move vertically and swing;

[0037] A transmission assembly 8 is disposed inside the cavity 3, and the transmission assembly 8 is in transmission connection with the driving assembly 7. The driving assembly 7 is also used to drive the transmission assembly 8, thereby driving the transverse motor 4 and the friction pair 5 to move;

[0038] During the wear resistance test, the electric chuck 6 operates to clamp the workpiece, the transverse motor 4 operates to drive the friction pair 5 to rotate, the drive assembly 7 operates initially to drive the electric chuck 6 and the workpiece to move downward, forcing the cylindrical part on the workpiece to contact the friction pair 5, and then test the cylindrical part on the workpiece. After the test is completed, the drive assembly 7 drives the electric chuck 6 and the workpiece to move upward and reset, and also drives the transmission assembly 8 to operate, forcing the transverse motor 4 and the friction pair 5 to move horizontally. Then the drive assembly 7 operates again, first driving the electric chuck 6 and the workpiece to swing, and then driving the electric chuck 6 and the workpiece to move downward, forcing the conical part on the workpiece to contact the friction pair 5, and then testing the conical part on the workpiece.

[0039] Among them, the transverse motor 4 is movably plugged into the side wall of the friction station 2, one end of the transverse motor 4 is plugged into the cavity 3, the material of the friction pair 5 is selected according to actual needs, and the axis of the electric chuck 6 is parallel to the axis of the friction pair 5 in the initial state;

[0040] When in use, one end of the screw head is plugged into the electric chuck 6. After the electric chuck 6 is running, the screw head is clamped and fixed. At this time, the axis of the screw head is parallel to the axis of the friction pair 5. At this time, the transverse motor 4 is started. When the transverse motor 4 is running, it drives the friction pair 5 to rotate. Then the drive component 7 is started. After the drive component 7 is running, it drives the electric chuck 6 and the screw head to move downward. The cylindrical outer wall on the screw head just contacts the rotating friction pair 5, and then the friction test is performed on the cylindrical outer wall of the screw head. After the test, the drive component 7 is operated and drives the electric chuck The disk 6 and the screw head move up and reset, and also drive the transmission assembly 8 to operate. When the transmission assembly 8 operates, it drives the transverse motor 4 and the friction pair 5 to move, so that the position of the friction pair 5 changes. Then the drive assembly 7 is started again. The drive assembly 7 drives the electric chuck 6 and the screw head to swing. The conical bottom wall of the screw head is parallel to the friction pair 5. Then the drive assembly 7 drives the swinging electric chuck 6 and the screw head to move down. At this time, the conical part on the screw head just contacts the rotating friction pair 5, so as to perform a friction test on the conical outer wall of the screw head.

[0041] By setting the electric chuck 6, the friction pair 5 and the driving component 7, the driving component 7 first drives the screw head fixed on the electric chuck 6 to move down to contact the friction pair 5, so as to first perform a friction test on the cylindrical outer wall on the screw head, and then the driving component 7 drives the screw head to swing and then move again to contact the friction pair 5, and then perform a friction test on the conical outer wall on the screw head. This is conducive to sequentially testing the wear resistance of two different positions on the screw head, and can adapt not only to special-shaped workpieces such as screw heads, but also to workpieces of common shapes, with high test efficiency, accurate measurement and high degree of automation.

[0042] Example 2: See Figure 3-Figure 5, which is different from the above embodiment, the driving assembly 7 includes a movable plate 701 located above the electric chuck 6 and a vertical cylinder 702 fixedly installed in the cavity 3, the output end of the vertical cylinder 702 passes through the bottom wall of the friction station 2 and is fixedly connected to the movable plate 701, a pressure sensor 703 is fixed at the bottom of the movable plate 701, and an assembly frame 704 is fixedly connected to the bottom of the pressure sensor 703, the electric chuck 6 is installed on the inner side of the assembly frame 704, and the outer rotation of the electric chuck 6 is connected to a collar 705 , base shafts 706 are fixed on both sides of the collar 705, and the two base shafts 706 are rotatably connected to the two sides of the assembly frame 704 respectively, a worm wheel 707 is fixed to the end of one of the base shafts 706, and a worm 708 is meshed and connected to the edge of the worm wheel 707, and bearing seats 709 are installed at both ends of the worm 708, and the two bearing seats 709 are fixedly connected to the assembly frame 704, and a first motor 710 is fixed on one of the bearing seats 709, and the output shaft of the first motor 710 is fixedly connected to the end of the worm 708;

[0043] Among them, four vertical cylinders 702 are set, and the output ends of the four vertical cylinders 702 are respectively fixed to the four corners of the bottom of the movable plate 701. When in use, the vertical cylinders 702 are started, and the vertical cylinders 702 are extended and retracted to drive the movable plate 701 to move vertically. When the movable plate 701 moves vertically, it drives the pressure sensor 703, the assembly frame 704 and the electric chuck 6 at the bottom to move vertically, and then drives the screw head to move vertically. Before the friction test is performed on the conical part of the screw head, the first motor 710 is started first. The operation of the first motor 710 drives the worm 708 to rotate. When the worm 708 rotates, it drives the worm wheel 707 to rotate. When the worm wheel 707 rotates, it drives the base shaft 706 and the collar 705 to rotate, and then drives the electric chuck 6 in the collar 705 and the screw head installed on the electric chuck 6 to rotate;

[0044] By setting up the driving assembly 7, it is advantageous to drive the installed screw head to move vertically directly or first swing and then move vertically through the vertical cylinder 702 and the first motor 710, respectively, so as to make different areas on the screw head contact the friction pair 5, thereby matching the test requirements of different positions.

[0045] Example 3, see Figure 6 - Figure 8, which is different from the above embodiment, the transmission assembly 8 includes a screw 801, a guide rod 802 and a rotating shaft 803 arranged inside the cavity 3, the screw 801, the guide rod 802 and the rotating shaft 803 are distributed in parallel, both ends of the screw 801 are rotatably connected to the inner wall of the cavity 3, a nut seat 804 is threadedly connected to the worm 708, the nut seat 804 is fixedly connected to the horizontal motor 4, the guide rod 802 is movably plugged into the nut seat 804, both ends of the guide rod 802 are fixedly connected to the inner wall of the cavity 3, the rotating shaft 803 is arranged directly above the screw 801 and one end is rotatably connected to the inner wall of the cavity 3, the screw 801 A driven synchronous wheel 805 is fixed, and an active synchronous wheel 806 and a driving gear 807 are fixed on the rotating shaft 803. The active synchronous wheel 806 is connected to the driven synchronous wheel 805 through a synchronous belt 808. A vertically arranged driving rack 809 is meshed on one side of the driving gear 807. The driving rack 809 is vertically slidably connected to the inner wall of the cavity 3. A cross bar 810 is fixedly arranged at the bottom end of the driving rack 809. A strip-shaped through groove 21 communicating with the inside of the cavity 3 is opened on the side wall of the friction station 2. An extension rod 711 is fixedly connected to the edge of the movable plate 701. The extension rod 711 passes through the strip-shaped through groove 21 and extends to the bottom of the cross bar 810.

[0046] The weight of the driving rack 809 is not enough to drive the driving gear 807 to rotate by gravity, and four guide rods 802 are provided, and the four guide rods 802 are movably plugged with the four corners of the nut seat 804 respectively;

[0047] When in use, after the friction test is performed on the cylindrical part of the screw head, the vertical cylinder 702 is started to control the movable plate 701 to move up and reset, and continue to move up after resetting. At this time, the extension rod 711 on the movable plate 701 moves up synchronously with it, and the extension rod 711 pushes the cross bar 810, thereby driving the driving rack 809 to slide vertically upward. The driving rack 809 moves up to drive the driving gear 807 to rotate, thereby adjusting the rotating shaft 803 and the active synchronous wheel 806 to rotate. The active synchronous wheel 806 drives the driven synchronous wheel 805 to rotate through the synchronous belt 808. When the driven synchronous wheel 805 rotates, it drives the screw 801 to rotate. When the screw 801 rotates, the nut seat 804 moves, thereby driving the transverse motor 4 to move. When the transverse motor 4 moves, it drives the friction pair 5 to move. After the friction pair 5 moves, the position of the wear area in the previous friction test changes. When the wear resistance test is performed on the conical part of the screw head later, it is ensured that the previously unworn area of ​​the friction pair 5 is in contact with the conical part of the screw head.

[0048] By setting the transmission component 8, it is helpful to adjust the position of the friction pair 5 between two test operations, so that the contact position between the friction pair 5 and the screw head is different, the initial friction resistance is the same, the consistency of the test conditions is ensured, the experimental results are more stable and reliable, and the phenomenon that continuous testing at the same position on the friction pair 5 causes the friction force to change and thus affects the test results is avoided.

[0049] Example 4, see Figure 5 , which is different from the above-mentioned embodiment, the electric chuck 6 is externally fixedly sleeved with a driven gear 712, the outer wall of the sleeve 705 is fixed with a sleeve 713, a second motor 714 is fixed on one side of the sleeve 713, a movable shaft 715 is fixed to the output shaft of the second motor 714, the movable shaft 715 is rotatably connected to the sleeve 713, a driving gear 716 is fixed to one end of the movable shaft 715, the driving gear 716 is meshed with the driven gear 712, the bottom wall of the friction station 2 is fixedly connected with a mounting frame 9, an infrared sensor 10 is mounted on the mounting frame 9, the infrared sensor 10 is distributed in parallel with the friction pair 5, the infrared sensor 10 points to the top area of ​​the friction pair 5, a vertical strip through hole 11 is opened on the mounting frame 9, the infrared sensor 10 passes through the strip through hole 11 and is fixed to the mounting frame 9 by a nut;

[0050] Among them, since the outer wall of the screw head is provided with a diversion groove, the part of the screw head that contacts the friction pair 5 when it moves downward after installation may be an invalid position where the diversion groove is located, and thus the test cannot be performed;

[0051] When in use, the infrared sensor 10 is used to monitor the obstruction on the top of the friction pair 5. If the position of the screw head is appropriate after it moves down, it will block the infrared sensor 10. If the position of the screw head is inappropriate after it moves down, it means that the infrared sensor 10 is facing the diverter groove, that is, the diverter groove on the screw head contacts the friction pair 5. At this time, the infrared sensor 10 sends an electrical signal to control the operation of the second motor 714. After the second motor 714 is operated, it drives the driving gear 716 to rotate. When the driving gear 716 rotates, it drives the driven gear 712 to rotate, and then drives the electric chuck 6 to rotate. When the electric chuck 6 rotates, it drives the screw head installed inside to rotate. After the screw head rotates, the diverter groove changes its position accordingly, so that the effective area on the screw head rotates to the top of the friction pair 5.

[0052] By setting the infrared sensor 10 and the second motor 714, when the infrared sensor 10 detects that the screw head position is wrong, the second motor 714 is controlled to operate, and then the angle of the screw head is adjusted so that only the effective test area of ​​the screw head contacts the friction pair 5, without manual adjustment, and the degree of automation is high.

[0053] Example 5, see Fig. 9 and Fig.10, which is different from the above-mentioned embodiment, a mounting hole 717 and a slide groove 718 are provided at the top of the extension rod 711, a lever 719 is provided in the mounting hole 717, the middle part of the lever 719 is rotatably connected to the inner wall of the mounting hole 717, the bottom end of the lever 719 corresponds to the center position of the electric chuck 6, a push rod 720 is hinged on the top of the lever 719, a strip slider 721 is hinged on one end of the push rod 720, the strip slider 721 is slidably connected to the slide groove 718, an L-shaped base block 722 is fixed on one end of the strip slider 721, and a weight block 723 is fixedly connected to the bottom end of the lever 719;

[0054] When the screw head is installed on the electric chuck 6, one end of the screw head just presses against the lever 719. At this time, the lever 719 is in an inclined state, and the slide groove 718 extends toward the strip-shaped through groove 21.

[0055] After the two rounds of testing are completed, the screw head is disassembled. At this time, the lever 719 swings to a vertical state under the action of the weight and speed. When the lever 719 swings, it pushes the push rod 720 to move. The push rod 720 then pushes the strip slider 721 to slide. The strip slider 721 moves into the strip through groove 21 at this time, and drives the L-shaped base block 722 to move above the cross bar 810. At this time, the vertical cylinder 702 is started again to drive the movable plate 701, the strip slider 721 and the L-shaped base block 722 to move downward, which can drive the driving rack 809 to slide downward. Similarly, the transmission assembly 8 can be reversed to control the horizontal motor 4 and the friction pair 5 to move and reset;

[0056] By setting the lever 719, the push rod 720, the strip slider 721 and the L-shaped base block 722, after two rounds of testing of a single screw head are completed, the gravity of the lever 719 drives the L-shaped base block 722 to move to the cross bar 810, and then the drive assembly 7 is started to drive the transmission assembly 8 to run in the reverse direction, which is beneficial to the movement and reset of the friction pair 5 after the driving movement, and is beneficial to multiple repeated testing work.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A screw head wear tester for plastic extrusion equipment, comprising a main body and a friction station arranged on the main body, characterized in that: A cavity corresponding to the position of the friction station is arranged in the main body, a transverse motor is installed on the side wall of the friction station, a friction pair is fixed on the output shaft of the transverse motor, and an electric chuck for clamping a workpiece is arranged above the friction pair; A driving assembly is provided on the bottom wall of the friction station, and the driving assembly is used to drive the electric chuck to move vertically and swing; A transmission assembly is arranged inside the cavity, the transmission assembly is in transmission connection with the driving assembly, and the driving assembly is also used to drive the transmission assembly, thereby driving the transverse motor and the friction pair to move; The driving assembly includes a movable plate located above the electric chuck and a vertical cylinder fixedly installed in the cavity, the output end of the vertical cylinder passes through the bottom wall of the friction station and is fixedly connected to the movable plate, a pressure sensor is fixed at the bottom of the movable plate, an assembly frame is fixedly connected at the bottom of the pressure sensor, and the electric chuck is installed on the inner side of the assembly frame; The electric chuck is rotatably connected to the outside with a collar, and base shafts are fixed on both sides of the collar, and the two base shafts are rotatably connected to the two sides of the assembly frame respectively, a worm wheel is fixed to the end of one of the base shafts, and a worm is meshingly connected to the edge of the worm wheel, and bearing seats are installed at both ends of the worm, and the two bearing seats are fixedly connected to the assembly frame, and a first motor is fixed on one of the bearing seats, and the output shaft of the first motor is fixedly connected to the end of the worm; The transmission assembly includes a screw, a guide rod and a rotating shaft arranged inside the cavity, the screw, the guide rod and the rotating shaft are distributed in parallel, both ends of the screw are rotatably connected to the inner wall of the cavity, a nut seat is threadedly connected to the screw, the nut seat is fixedly connected to the transverse motor, the guide rod is movably plugged into the nut seat, both ends of the guide rod are fixedly connected to the inner wall of the cavity, the rotating shaft is arranged just above the screw and one end is rotatably connected to the inner wall of the cavity, a driven synchronous wheel is fixed on the screw, an active synchronous wheel and a driving gear are fixed on the rotating shaft, the active synchronous wheel is connected to the driven synchronous wheel through a synchronous belt, a vertically arranged driving rack is meshed on one side of the driving gear, the driving rack is vertically slidably connected to the inner wall of the cavity, and a cross bar is fixedly arranged at the bottom end of the driving rack; During the wear resistance test, the electric chuck operates to clamp the workpiece, the transverse motor operates to drive the friction pair to rotate, and the drive assembly operates initially to drive the electric chuck and the workpiece downward, forcing the cylindrical part on the workpiece to contact the friction pair, and then test the cylindrical part on the workpiece. After the test is completed, the drive assembly drives the electric chuck and the workpiece to move up and reset, and also drives the transmission assembly to operate, forcing the transverse motor and the friction pair to move laterally. After the friction pair moves, the position of the worn area in the previous friction test changes. When the conical part of the screw head is subsequently tested for wear resistance, it is ensured that the previously unworn area of ​​the friction pair is in contact with the conical part of the screw head. Then the drive assembly operates again, first driving the electric chuck and the workpiece to swing, and then driving the electric chuck and the workpiece downward, forcing the conical part on the workpiece to contact the friction pair, and then testing the conical part on the workpiece.

2. A screw head wear tester for plastic extrusion equipment according to claim 1, characterized in that: The side wall of the friction station is provided with a strip-shaped through groove communicating with the interior of the cavity, and the edge of the movable plate is fixedly connected with an extension rod, which passes through the strip-shaped through groove and extends to the bottom of the cross bar.

3. A screw head wear tester for plastic extrusion equipment according to claim 2, characterized in that: A driven gear is fixedly sleeved outside the electric chuck, a sleeve is fixed to the outer wall of the sleeve ring, a second motor is fixed to one side of the sleeve, a movable shaft is fixed to the output shaft of the second motor, the movable shaft is rotatably connected to the sleeve, a driving gear is fixed to one end of the movable shaft, and the driving gear is meshed with the driven gear.

4. A screw head wear tester for plastic extrusion equipment according to claim 3, characterized in that: The bottom wall of the friction station is fixedly connected to a mounting frame, on which an infrared sensor is installed. The infrared sensor is distributed parallel to the friction pair and points to the top area of ​​the friction pair. The infrared sensor is used to monitor obstructions on the top of the friction pair to ensure that the effective test area on the screw head contacts the friction pair.

5. A screw head wear tester for plastic extrusion equipment according to claim 4, characterized in that: The mounting frame is provided with a vertical strip-shaped through hole, and the infrared sensor passes through the strip-shaped through hole and is fixed on the mounting frame by a nut.

6. A screw head wear tester for plastic extrusion equipment according to claim 3, characterized in that: A mounting hole and a slide groove are provided on the top of the extension rod, a lever is provided in the mounting hole, the middle part of the lever is rotatably connected to the inner wall of the mounting hole, a push rod is hinged on the top of the lever, a strip slider is hinged on one end of the push rod, the strip slider is slidably connected to the slide groove, an L-shaped base block is fixed on one end of the strip slider, the L-shaped base block can move to the top of the cross bar and then move downward, thereby driving the cross bar to move downward.

7. A screw head wear tester for plastic extrusion equipment according to claim 6, characterized in that: The bottom end of the lever corresponds to the center position of the electric chuck, and a weight block is fixedly connected to the bottom end of the lever.

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