Drop hammer impact testing machine for pipes

Abstract

The utility model relates to the technical field of testing equipment, in particular to a drop hammer impact testing machine for pipes, which comprises a hammer head lifting mechanism, a testing bracket, a rotating wheel and a driving mechanism, the hammer head lifting mechanism is arranged above the testing bracket, a hammer head is arranged in the hammer head lifting mechanism, and the rotating wheel is arranged on the testing bracket. A to-be-tested pipe is placed on the testing bracket, the output end of the driving mechanism is connected with the rotating wheel, the driving mechanism and the rotating wheel are located below the to-be-tested pipe, the rim of the rotating wheel makes contact with the lower surface of the to-be-tested pipe, the pipe diameter of the to-be-tested pipe is input into the driving mechanism, and a hammer head freely falls off. After the to-be-tested pipe is impacted, if the pipe is damaged, the rotating wheel is driven to rotate, the to-be-tested pipe is driven to rotate to an experiment angle, the impact is continued, and the process is repeated until the to-be-tested pipe rotates for a circle, so that the operation process is simplified, and the test safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of testing equipment, and more specifically, to a drop hammer impact testing machine for pipes. Background Art

[0002] As plastic pipes are widely used in building materials, construction and other industries, testing equipment has become an indispensable equipment. Impact collision is a common mechanical phenomenon in daily life and engineering applications. Experimental simulation is an effective research method. The basic principle of the drop hammer impact test is to use the speed of free fall to impact the specimen, so as to test the response of the test pipe under impact.

[0003] For example, Chinese patent CN114354345B discloses a fully automatic drop-hammer impact tester for pipes, which includes multiple hammers, a pipe translation frame is arranged on the surface of a fixed frame, a pipe lifting frame is arranged inside the pipe translation frame, and the pipe to be tested is placed on the surface of the pipe lifting frame; a test port is arranged just above the rear end of the fixed frame, and the test port is located above the pipe to be tested and the moving track of the hammer; and a hammer lifting mechanism is also arranged above the test port. In this fully automatic drop-hammer impact tester for pipes, by arranging a hammer lifting mechanism, the grabbing of different hammers is realized, and by arranging a pipe translation frame and a pipe lifting frame inside it, the automatic entry and output of the pipe to be tested is realized, and it can be applied to the testing of pipes of different diameters. By setting up a hammer clamping cylinder, when the hammer falls freely to impact the pipe to be tested and is bounced up, the piston shaft of the hammer clamping cylinder is output to clamp the bounced hammer, thereby avoiding the hammer falling down again after being bounced up and causing a secondary impact on the pipe to be tested, thereby ensuring the reliability of the test.

[0004] However, according to GB / T 14152-2001, when the outer diameter of the pipe to be tested is greater than 40 mm, the pipe needs to be subjected to a clockwise rotation test. The test device in the above scheme requires manual rotation, which is cumbersome to operate and has certain safety hazards. Utility Model Content

[0005] The utility model aims to overcome the deficiencies in the prior art and provide a drop hammer impact testing machine for pipes, which can automatically rotate the pipe to be tested to a testing position, simplify operation, and reduce safety hazards.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: including a hammer lifting mechanism, a test bracket, a rotating wheel and a driving mechanism, the hammer lifting mechanism is arranged above the test bracket, a hammer is arranged in the hammer lifting mechanism, a pipe to be tested is placed on the test bracket, the output end of the driving mechanism is connected to the rotating wheel, the driving mechanism and the rotating wheel are located below the pipe to be tested, and the rim of the rotating wheel is in contact with the lower surface of the pipe to be tested.

[0007] The utility model is a drop hammer impact tester for pipes. The pipe to be tested is placed on the test bracket, and the hammer head lifting mechanism is used to make the hammer head fall freely to impact the pipe to be tested, and the test results are recorded. If the pipe to be tested is not damaged, the hammer head is raised, and the driving mechanism is started. The driving mechanism drives the rotating wheel to rotate, and the rim of the rotating wheel rubs against the side of the pipe to be tested, driving the pipe to be tested to rotate, and stops after rotating to the test angle corresponding to the pipe to be tested, and continues the test. When the pipe to be tested is damaged or rotated 360 degrees cumulatively, the pipe to be tested is replaced. There is no need to manually rotate the pipe to be tested, which simplifies the operation process, improves the safety of the test, and makes the test more accurate.

[0008] Furthermore, there are two groups of rotating wheels, the top heights of the two groups of rotating wheels are equal, the center of gravity of the pipe to be tested is located between the two groups of rotating wheels, the axes of the two groups of rotating wheels are parallel to the axis of the pipe to be tested, and the two groups of rotating wheels can reduce the requirements for the friction between the rotating wheels and the pipe to be tested. The rotating wheels of equal height are distributed on both sides of the center of gravity of the pipe to be tested, which can ensure that the pipe to be tested does not tilt. The axis of the rotating wheel is parallel to the axis of the pipe to be tested, which can eliminate the axial component of force acting on the pipe to be tested and improve the transmission efficiency.

[0009] Furthermore, the driving mechanism includes a motor and a gear box, the output end of the motor is connected to the gear box, and the gear box is connected to the rotating wheel. During the test, the motor drives the gears in the gear box to rotate, thereby driving the rotating wheel to rotate. The gear box feeds back the rotation stroke of the internal gear to the controller in the motor. When the gear rotates to the set stroke, the motor stops working.

[0010] Furthermore, it also includes a second lifting device, and the driving mechanism is installed on the top of the second lifting device. When the rotation operation is performed, the second lifting device is slightly raised to lift the pipe to be tested from the test bracket, so as to avoid friction between the pipe to be tested and the test bracket during the rotation process, reduce the resistance encountered by the pipe to be tested during the rotation, avoid additional wear of the pipe to be tested, and reduce energy consumption.

[0011] Furthermore, the hammer lifting mechanism includes a hammer grab device, a transmission mechanism and a support frame, the hammer grab device is connected to the end of the transmission mechanism, and the hammer grab device and the transmission mechanism are closed and installed in the support frame. The hammer grab device can grab the hammer head. When the hammer lifting mechanism is working, the external motor drives the hammer grab device to rise and fall through the transmission mechanism. After the hammer head is moved to a set height, the hammer grab device releases the hammer head, allowing the hammer head to fall naturally and impact the pipe to be tested. After the impact is completed, the hammer grab device can be lowered to grab the hammer head and repeat the above test process; the support frame supports the hammer grab device and the transmission mechanism, and separates the hammer grab device and the transmission mechanism from the outside world to prevent the hammer head from being affected by the outside world during the test and causing test errors.

[0012] Furthermore, the transmission mechanism includes a counterweight, a chain and a gear set, the gear set is located at the top of the support frame, the chain passes around the gear set, and the counterweight and the hammer device are connected to both ends of the chain. The counterweight can adjust the center of gravity of the transmission mechanism to achieve a dynamic balance, reduce vibration and noise during the transmission process, and extend the service life of the transmission mechanism.

[0013] Furthermore, it comprises a pipe conveying device and a first pipe pushing device for pushing the pipe on the pipe conveying device to the test bracket, wherein the first pipe pushing device, the pipe conveying device and the test bracket are arranged in a straight line in sequence. When the pipe to be tested is lifted from the pipe conveying device and the pipe conveying device is lifted to a position equal to or slightly higher than the test bracket, the first pipe pushing device pushes the pipe to be tested on the pipe conveying device into the test bracket.

[0014] Furthermore, it also includes a hammer head placement rack and a grabbing device, wherein a plurality of hammer heads are placed inside the hammer head placement rack, and the grabbing device is arranged between the hammer head lifting mechanism and the hammer head placement rack. The grabbing device clamps the hammer head from the hammer head placement rack according to the outer diameter and type of the input pipe to be tested, takes the hammer head out of the hammer head placement rack, and the hammer head is clamped by the hammer grabbing device.

[0015] Furthermore, it also includes a hammer receiving device, which is located between the hammer head lifting mechanism and the test bracket. After the hammer head hits the pipe to be tested, it bounces upwards and bounces above the hammer receiving device. The hammer receiving device receives the hammer head that falls again to avoid secondary impact and affect the test data.

[0016] Furthermore, it also includes a recovery device, which is arranged on the side of the hammer lifting mechanism and opposite to the side wall of the pipe to be tested. After the test of a pipe to be tested is completed, the recovery device separates the tested pipe from the test bracket.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model discloses a drop hammer impact testing machine for pipes, which can automatically rotate the pipe to be tested to a set angle for testing, thereby simplifying operation steps, reducing labor costs, and lowering safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a drop weight impact testing machine for pipes according to the utility model from a first perspective;

[0020] Figure 2 This is a schematic diagram of a system for controlling the rotation of a rotating wheel according to the present invention;

[0021] Figure 3 It is a second perspective structural schematic diagram of the drop weight impact testing machine for pipes of the utility model;

[0022] Figure 4 It is a structural schematic diagram of a rotating device of a drop weight impact testing machine for pipes of the utility model;

[0023] Figure 5 It is a structural schematic diagram of a hammer grab device of a drop hammer impact testing machine for pipes of the utility model;

[0024] Figure 6 It is a structural schematic diagram of a pipe conveying device of a drop weight impact testing machine for pipes of the utility model;

[0025] Figure 7 It is a structural schematic diagram of a first pipe pushing device of a drop weight impact testing machine for pipes of the utility model;

[0026] In the attached drawings: 1. hammer lifting mechanism; 11. hammer grab device; 111. first push device; 112. clamping block; 113. spring; 114. second light eye; 12. transmission mechanism; 121. counterweight block; 1211. first light eye; 122. chain; 123. gear set; 13. support frame; 131. first guide tube; 1311. first switch door; 132. second guide tube; 1321. second switch door; 133. top box; 2. test bracket; 21. bottom box; 22. V-shaped plate; 23. base; 3. rotating wheel; 31. driving mechanism; 311. motor; 312 , gear box; 32, second lifting device; 4, pipe to be tested; 5, pipe conveying device; 51, constant temperature box; 52, conveyor belt; 53, first lifting device; 54, telescopic device; 55, baffle; 6, first pipe pushing device; 61, cylinder; 62, piston rod; 63, push plate; 7, hammer head placement rack; 71, third light eye; 8, grabbing device; 81, clamp; 82, lifting and rotating device; 83, guide rail; 84, slider; 9, hammer receiving device; 91, support plate; 92, second pushing device; 93, fourth light eye; 10, recovery device; 101, second pipe pushing device; 102, recovery box. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for exemplary descriptions, and are only schematic diagrams, not actual pictures, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0028] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] Embodiment 1

[0030] like Figures 1 to 7The embodiment of the drop hammer impact tester for pipes of the utility model is shown, which includes a hammer lifting mechanism 1, a test bracket 2, a rotating wheel 3 and a driving mechanism 31. The hammer lifting mechanism 1 is arranged above the test bracket 2, and a hammer is arranged in the hammer lifting mechanism 1. The pipe 4 to be tested is placed on the test bracket 2. The driving mechanism 31 is located on the side of the test bracket 2. The driving mechanism 31 and the rotating wheel 3 are located below the pipe 4 to be tested. The rim of the rotating wheel 3 contacts the lower surface of the pipe 4 to be tested. Figure 1 As shown, in this embodiment, two groups of rotating wheels 3 are provided, and the top heights of the two groups of rotating wheels 3 are equal. The center of gravity of the pipe 4 to be tested is located between the two groups of rotating wheels 3, and the axes of the two groups of rotating wheels 3 are parallel to the axis of the pipe 4 to be tested. Providing two groups of rotating wheels 3 can reduce the requirements for the friction between the rotating wheels 3 and the pipe 4 to be tested; the rotating wheels 3 of equal height are distributed on both sides of the center of gravity of the pipe 4 to be tested, which can keep the pipe 4 to be tested balanced and prevent tilting, and prevent the pipe 4 to be tested from slipping while improving the test accuracy; the axis of the rotating wheel 3 is parallel to the axis of the pipe 4 to be tested, which can eliminate the axial force acting on the pipe 4 to be tested, and improve the transmission efficiency.

[0031] like Figure 2 As shown, a V-shaped plate 22 is provided on the top of the test bracket 2. The angle of the V-shaped plate 22 is 120° and its length is greater than the length of the pipe 4 to be tested. Its fixed position should make the vertical projection of the hammer impact point within 2.5 mm from the center line of the V-shaped plate 22.

[0032] The utility model of the drop hammer impact tester for pipes places the pipe 4 to be tested on the V-shaped plate 22 above the test bracket 2, uses the hammer lifting mechanism 1 to make the hammer fall freely, impacts the pipe 4 to be tested, and records the test results. If the pipe 4 to be tested is not damaged, the hammer is raised, and the driving mechanism 31 drives the rotating wheel 3 to rotate to the test angle corresponding to the pipe 4 to be tested and then stops, and the test is continued. When the pipe 4 to be tested is damaged or rotated 360° cumulatively, the pipe 4 to be tested is replaced and the test is repeated. There is no need to manually rotate the pipe 4 to be tested, which simplifies the operation process, improves the safety of the test, and makes the test more accurate.

[0033] When the diameter of the pipe 4 to be tested is less than 40 mm, each pipe 4 to be tested is subjected to only one impact, and no rotation operation is required;

[0034] When the diameter of the pipe 4 to be tested is greater than 40 mm, multiple impacts are performed on different positions on the side of the pipe 4 to be tested. For example, when testing a pipe 4 to be tested with a diameter of 125 mm, after the first impact, the pipe 4 to be tested is rotated 60° by the rotating wheel 3 and the second impact is performed. If the pipe 4 to be tested is not damaged, it is rotated 60° again and the third impact is performed. The above operation is repeated until the pipe 4 to be tested is damaged or the pipe 4 to be tested is rotated 360°, and then the pipe 4 to be tested is replaced to continue the test. When the pipe 4 to be tested is rotated 360°, it has been subjected to 6 impacts.

[0035] like Figure 4 As shown, in this embodiment, the driving mechanism 31 includes a motor 311 and a gear box 312 , the output end of the motor 311 is connected to the gear box 312 , and the gear box 312 is connected to the rotating wheel 3 .

[0036] The gear box 312 is provided with a pedometer wheel meshing with other gears, and the pedometer wheel is connected to the controller of the motor 311. Figure 2 As shown, when the test is carried out, the motor 311 is turned on, the motor 311 drives the gear in the gear box 312 to rotate, and drives the rotating wheel 3 to rotate. The pedometer wheel feeds back the rotation stroke to the controller. When the pedometer wheel rotates through the set stroke, the controller controls the motor 311 to stop working, so as to control the rotation angle of the rotating wheel. The control circuit of the controller can be realized by simple programming by technicians in this field, and the provision of power is also common knowledge in this field, and the control method and circuit connection are not explained in detail.

[0037] A second lifting device 32 can be provided at the bottom of the driving mechanism 31. When the rotation operation is performed, the two second lifting devices 32 are slightly lifted to the same height, and the pipe 4 to be tested is slightly lifted from the test bracket 2, so as to avoid friction between the pipe 4 to be tested and the test bracket 2 during the rotation process, reduce the resistance encountered by the pipe 4 to be tested during rotation, avoid additional wear of the pipe 4 to be tested, and reduce energy consumption.

[0038] This embodiment also includes a bottom box 21 , the test bracket 2 and the rotating wheel 3 are located inside the bottom box 21 , the hammer lifting mechanism 1 is arranged at the top of the bottom box 21 , and the V-shaped plate 22 is connected to the side of the bottom box 21 .

[0039] In this embodiment, a base 23 is provided below the test bracket 2 . The base 23 is installed at the bottom of the bottom box 21 , and the second lifting device 32 is installed on the base 23 .

[0040] In addition, the rotating wheel 3 , the driving mechanism 31 and the second lifting device 32 may also be installed on the side of the test bracket 2 , and the top of the rotating wheel 3 is lower than the bottom of the upper surface of the V-shaped plate 22 .

[0041] The hammer lifting mechanism 1 includes a hammer grab device 11, a transmission mechanism 12 and a support frame 13. The hammer grab device 11 is connected to the end of the transmission mechanism 12, and the hammer grab device 11 and the transmission mechanism 12 are closed and installed in the support frame 13. The transmission mechanism 12 includes a counterweight block 121, a chain 122 and a gear set 123. The chain 122 passes around the gear set 123. The counterweight block 121 and the hammer grab device 11 are connected to both ends of the chain 122. In this embodiment, the gear set 123 includes a driving wheel connected to an external motor, a driven wheel located on the left and right sides of the driving wheel, and a sprocket located at the top of the gear set 123, wherein the driving wheel is meshed with the driven wheel, and a sprocket with a diameter larger than the driven wheel is fixedly connected to the rotating shaft of the driven wheel, and all sprockets are matched with the chain 122.

[0042] Any transmission mechanism 12 that can control the lifting of the hammer grab device 11 is applicable to the present invention, such as screw transmission, gear transmission, slider transmission, etc. The transmission mechanism 12 listed in this embodiment is not intended to limit the present invention.

[0043] The hammer grabbing device 11 can grab the hammer head, such as Figure 5 As shown, the hammer grabbing device 11 has two clamping blocks 112 for clamping the hammer head, and the bottom surface can be in contact with the plane at the end of the hammer head; the clamping block 112 is connected with a first pushing device 111 and a spring 113. When the hammer head is grabbed, the first pushing device 111 closes the two clamping blocks 112. When the hammer head is released, the first pushing device 111 pushes the clamping blocks 112 away from each other, compresses the spring 113, and shortens the spring 113. The spring 113 can apply pressure to the first pushing device 111 when the power is off, and assist in clamping the hammer head, so as to prevent the hammer grabbing device 11 from releasing the force due to the loss of power of the first pushing device 111. A second photocell 114 is provided in the hammer grabbing device 11 to sense the position of the hammer head, so as to clamp the hammer head more accurately.

[0044] When the hammer lifting mechanism 1 is working, the external motor rotates the driving wheel, driving the driven wheel meshing with it to rotate, driving the coaxial sprocket to rotate, causing the chain 122 meshing with it to move, and the counterweight block 121 and the hammer grab device 11 to move up and down. After the hammer head is moved to the set height, the hammer grab device 11 releases the hammer head, allowing the hammer head to fall naturally and impact the pipe 4 to be tested. After the impact is completed, the hammer grab device 11 can be lowered to grab the hammer head and repeat the above test process.

[0045] The counterweight block 121 can adjust the center of gravity of the transmission mechanism 12 to achieve a dynamic balance, reduce vibration and noise during the transmission process, and extend the life of the transmission mechanism 12.

[0046] In this embodiment, the support frame 13 includes a first conduit 131, a second conduit 132 and a top box 133, the gear set 123 is installed in the top box 133, the counterweight 121 moves in the first conduit 131, and the hammer grab device 11 and the hammer head move in the second conduit 132, separating the transmission mechanism 12, the hammer grab device 11 and the hammer head from the outside world, so that the test is not affected by external factors such as air flow, thereby reducing experimental errors.

[0047] The support frame 13 is provided with a first opening and closing door 1311 for inspecting and repairing the hammer lifting mechanism 1 .

[0048] In this embodiment, a first photo eye 1211 that can detect the height of the counterweight block 121 is provided at the bottom of the counterweight block 121. The first photo eye 1211 is connected to a transmission line, and the other end of the transmission line is connected to the hammer grab device 11. When the first photo eye 1211 detects that the counterweight block 121 has reached a set height, the height data is transmitted to the controller on the hammer grab device 11 through the transmission line, so that the hammer grab device 11 releases the hammer head.

[0049] This embodiment also includes a pipe conveying device 5 and a first pipe pushing device 6 for pushing the pipe 4 to be tested on the pipe conveying device 5 toward the test bracket 2. The bottom box 21 is provided with an opening on the side opposite to the pipe conveying device 5 for allowing the pipe 4 to be tested to pass through. When the pipe 4 to be tested rises from the pipe conveying device 5 and the pipe conveying device 5 rises to a position equal to or slightly higher than the test bracket 2, the first pipe pushing device 6 pushes the pipe 4 to be tested on the pipe conveying device 5 into the test bracket 2.

[0050] The first tube pushing device 6 which can push the tube 4 to be tested on the tube conveying device 5 onto the test bracket 2 is applicable to the present utility model, such as Figure 7 As shown, in this embodiment, the first tube pushing device 6 includes a cylinder 61, a piston rod 62 and a push plate 63 connected in sequence, the push plate 63 is directly opposite to the bottom surface of the tube 4 to be tested rising from the tube conveying device 5, the area of ​​the push plate 63 is larger than the bottom surface area of ​​the tube 4 to be tested, and the maximum length of the piston rod 62 is greater than the distance between the first tube pushing device 6 and the test bracket 2.

[0051] like Figure 6As shown, the pipe conveying device 5 includes a constant temperature box 51, a conveyor belt 52, a first lifting device 53 and a telescopic device 54. The conveyor belt 52 and the first lifting device 53 are arranged in the constant temperature box 51. The end of the conveyor belt 52 is close to the first lifting device 53. The telescopic device 54 is slidably connected to the top of the first lifting device 53, and the telescopic device 54 is telescoped between the first lifting device 53 and the test bracket 2. An opening is provided on the top of the constant temperature box 51 for allowing the first lifting device 53 and the pipe 4 to be tested to pass through. The pipe material 4 to be tested is stored in the constant temperature box 51. When the pipe conveying device 5 is working, the conveyor belt 52 conveys the pipe material 4 to be tested to the first lifting device 53. Then the first lifting device 53 rises to a position parallel to or slightly higher than the test bracket 2. The telescopic device 54 extends toward the test bracket 2, contacts the test bracket 2 or slightly covers the test bracket 2. The cylinder 61 in the first pipe pushing device pushes the piston rod 62. After the pipe material 4 to be tested is pushed into the test bracket 2 through the push plate 63, the telescopic device 54 is retracted and the first lifting device 53 is lowered to its original position. The telescopic device 54 can prevent the pipe material 4 to be tested from falling off during the process of being pushed into the test bracket 2 or from being unable to enter the test bracket 2 due to tilting.

[0052] A baffle 55 for blocking the pipe 4 to be tested may be provided in the thermostatic box 51. The baffle 55 is provided at the top of the thermostatic box 51. When the conveyor belt 52 is working, the baffle 55 can prevent the pipes 4 to be tested stacked in the thermostatic box 51 from falling onto the first lifting device 53, thereby ensuring that only one pipe 4 to be tested is conveyed to the first lifting device 53 at a time. The height of the baffle 55 can be adjusted according to the outer diameter of the input pipe 4 to be tested. The smaller the diameter of the pipe 4 to be tested, the lower the height of the baffle 55.

[0053] A small stopper may be provided on the surface of the conveyor belt 52 to prevent the pipe 4 to be tested from slipping during transportation.

[0054] This embodiment also includes a hammer receiving device 9, which is located between the hammer lifting mechanism 1 and the test bracket 2. After the hammer impacts the pipe 4 to be tested, it bounces upwards and bounces above the hammer receiving device 9. The hammer receiving device 9 receives the hammer that falls again to avoid secondary impact and affect the test data.

[0055] like Figure 3As shown, the hammer receiving device 9 includes a group of supporting plates 91 and a second pushing device 92 for pushing the supporting plates 91. One side of each supporting plate 91 is connected to the second pushing device 92, and the other side is in contact with other supporting plates 91. The front end of the supporting plate 91 is concave, and the front end of each supporting plate 91 forms a groove that matches the hammer head. After the hammer head impacts the pipe 4 to be tested, it bounces upward. After bouncing to the top of the hammer receiving device 9, the second pushing device 92 pushes the supporting plate 91 to the bottom of the hammer head. After the hammer head falls again, it falls into the groove formed by the front ends of each supporting plate 91. In this embodiment, the groove is a concave hemispherical shape similar to the shape of the bottom of the hammer head.

[0056] When the hammer head is received by the support plate 91, the support plate 91 only needs to be pushed out before the hammer head falls, which has low precision requirements; the structure is simple and not prone to failure; the support plate 91 is concave hemispherical in the middle, which can receive the hammer head more stably and prevent the hammer head from sliding to the side. In addition, a buffer material can be set on the support plate 91 to reduce the impact on the hammer receiving device 9.

[0057] A fourth photocell 93 is provided between the hammer receiving device 9 and the pipe 4 to be tested, and when the hammer head bounces up, an early warning is issued to automatically start the hammer receiving device 9.

[0058] The first photoeye 1211, the second photoeye 114 and the fourth photoeye 93 in this embodiment may also be replaced with other sensors that can achieve the purpose of the test.

[0059] Embodiment 2

[0060] This embodiment is the second embodiment of the drop hammer impact tester for pipes of the utility model. This embodiment is similar to the first embodiment, except that it also includes a hammer head placement rack 7 and a grabbing device 8. The hammer head placement rack 7 and the grabbing device 8 are both installed at the top of the bottom box 21. A plurality of hammers are placed inside the hammer head placement rack 7. The grabbing device 8 is arranged between the second conduit 132 and the hammer head placement rack 7. A second switch door 1321 is arranged on the side of the second conduit 132 opposite to the hammer head placement rack 7. The grabbing device 8 clamps the hammer head from the hammer head placement rack 7 according to the input hammer head specifications, takes the hammer head out of the hammer head placement rack 7, and the second switch door 1321 is opened. The grabbing device 8 sends the hammer head into the second conduit 132 through the second switch door 1321, and the hammer head is clamped by the grabbing device 11.

[0061] In this embodiment, the hammer head placement rack 7 can rotate around the center, and the tail of the hammer head is suspended on the hammer head placement rack 7. The grasping device 8 includes a clamp 81, a lifting and rotating device 82, a guide rail 83 and a slider 84. A third light eye 71 is provided above the hammer head placement rack 7, two vertically arranged parallel guide rails 83, one end of which faces the second switch door 1321, and the other end faces the hammer head placement rack 7. Two parallel sliders 84 are respectively installed on the guide rails 83, the lifting and rotating device 82 is arranged between the sliders 84, and the grasping device 81 is installed on the lifting and rotating device 82.

[0062] When taking the hammer head, the required hammer head specifications are input into the controller controlling the hammer head placement rack 7 and the grasping device 8, the hammer head placement rack 7 starts to rotate, and when the third light eye 71 detects that the hammer head of the required specifications is rotated to the front of the grasping device 8, the hammer head placement rack 7 stops rotating, and the lifting and rotating device 82 controls the clamp 92 to rotate to a position directly opposite the hammer head to clamp the hammer head. The lifting and rotating device 82 causes the hammer head to rise slightly and separate from the hammer head placement rack 7 to avoid resistance from the hammer head placement rack 7, and the grasping device 81 is rotated horizontally until the tip of the grasping device 81 faces the second switch door 1321, and the slider 84 moves horizontally through the guide rail 83, driving the hammer head to translate in the direction of the second switch door 1321, and sending the hammer head into the second conduit 132.

[0063] The third optical eye 71 in this embodiment can be replaced by other sensors that can identify the type of hammer head.

[0064] Embodiment 3

[0065] This embodiment is the third embodiment of the drop hammer impact tester for pipes of the utility model. This embodiment is similar to the first or second embodiment, except that it also includes a recovery device 10, the recovery device 10 includes a second pipe pushing device 101 and a recovery box 102, the second pipe pushing device 101 is facing the side wall of the pipe 4 to be tested, the second pipe pushing device 101 is similar in structure to the first pipe pushing device 6, the recovery box 102 is located on the other side of the pipe 4 to be tested, the recovery box 102 opens upward, and the opening height is lower than the bottom of the pipe 4 to be tested. The bottom box 21 is provided with openings on the two sides opposite to the second pipe pushing device 101 and the recovery box 102, through which the pipe 4 to be tested can pass.

[0066] When the test process of a tested pipe 4 is finished or the fourth optical eye 93 detects that the tested pipe 4 is broken, the recovery device 10 starts to work, and the second pipe pushing device 101 pushes the tested pipe 4 from the test bracket 2 into the recovery box 102 .

[0067] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A drop weight impact testing machine for pipes, characterized in that: The invention comprises a hammer lifting mechanism (1), a test bracket (2), a rotating wheel (3) and a driving mechanism (31), wherein the hammer lifting mechanism (1) is arranged above the test bracket (2), a hammer is arranged in the hammer lifting mechanism (1), a pipe to be tested (4) is placed on the test bracket (2), an output end of the driving mechanism (31) is connected to the rotating wheel (3), the driving mechanism (31) and the rotating wheel (3) are located below the pipe to be tested (4), and the rim of the rotating wheel (3) is in contact with the lower surface of the pipe to be tested (4).

2. A drop weight impact testing machine for pipes according to claim 1, characterized in that: There are two groups of rotating wheels (3), the top heights of the two groups of rotating wheels (3) are equal, the center of gravity of the pipe (4) to be tested is located between the two groups of rotating wheels (3), and the axes of the two groups of rotating wheels (3) are parallel to the axis of the pipe (4) to be tested.

3. A drop weight impact testing machine for pipes according to claim 1, characterized in that: The driving mechanism (31) comprises a motor (311) and a gear box (312); the output end of the motor (311) is connected to the gear box (312), and the gear box (312) is connected to the rotating wheel (3).

4. A drop weight impact testing machine for pipes according to claim 1, characterized in that: It also includes a second lifting device (32), and the driving mechanism (31) is installed on the top of the second lifting device (32).

5. A drop weight impact testing machine for pipes according to any one of claims 1 to 4, characterized in that: The hammer head lifting mechanism (1) comprises a hammer grabbing device (11), a transmission mechanism (12) and a support frame (13); the hammer grabbing device (11) is connected to the transmission mechanism (12); and the hammer grabbing device (11) and the transmission mechanism (12) are enclosed and installed in the support frame (13).

6. A drop weight impact testing machine for pipes according to claim 5, characterized in that: The transmission mechanism (12) comprises a counterweight (121), a chain (122) and a gear set (123); the gear set (123) is located at the top of the support frame (13); the chain (122) passes around the gear set (123); the counterweight (121) and the hammer grab device (11) are connected to both ends of the chain (122).

7. A drop weight impact testing machine for pipes according to claim 1, characterized in that: It also comprises a pipe conveying device (5) and a first pipe pushing device (6) for pushing the pipe on the pipe conveying device (5) toward the test bracket (2); the first pipe pushing device (6), the pipe conveying device (5) and the test bracket (2) are arranged in a straight line in sequence.

8. A drop weight impact testing machine for pipes according to claim 1, characterized in that: It also comprises a hammer head placement rack (7) and a grabbing device (8) for grabbing hammer heads from the hammer head placement rack (7) to the hammer head lifting mechanism (1); a plurality of hammer heads are placed inside the hammer head placement rack (7); and the grabbing device (8) is arranged between the hammer head lifting mechanism (1) and the hammer head placement rack (7).

9. A drop weight impact testing machine for pipes according to claim 1, characterized in that: It also comprises a hammer receiving device (9), wherein the hammer receiving device (9) is located between the hammer head lifting mechanism (1) and the test bracket (2).

10. A drop weight impact testing machine for pipes according to claim 1, characterized in that: It also comprises a recovery device (10), wherein the recovery device (10) is arranged on the side of the hammer lifting mechanism (1) and is opposite to the side wall of the pipe to be tested (4).

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