An impact test device for testing the connection reliability of dredging cutter teeth

Abstract

The present invention relates to an impact test device for testing the connection reliability of dredging cutter teeth, which includes a fixed bracket, a vertical sliding rod, a power assembly, an eccentric shaft, a connecting rod, a transmission sleeve, an impact rod, a buffer spring and an impact cushion block; a bracket guiding hole is arranged at the upper part of the fixed bracket, the vertical sliding rod penetrates through the bracket guiding hole and is fixed on the fixed bracket, the power assembly drives the eccentric shaft to rotate, the eccentric shaft drives the transmission sleeve to reciprocate up and down under the constraint of the vertical sliding rod through the connecting rod, the transmission sleeve drives the impact rod to reciprocate up and down through two buffer springs sleeved on the impact rod, the impact rod receives the acting force of the transmission sleeve and drives the impact cushion block to directly act on the test cutter teeth located below the device. The present invention has the advantages of simple structure, low manufacturing cost, economy and practicability, is applicable to laboratory testing of the connection reliability between dredging cutter teeth and cutter seats, and has the advantages of low test cost, short cycle and no influence on construction operations compared with in-situ ship testing.

Description

Technical Field

[0001] The present invention belongs to the technical field of dredging engineering, and particularly relates to an impact test device for testing the connection reliability of dredging cutter teeth. Background Art

[0002] Dredging engineering refers to the earthwork project of underwater excavation using a dredger or other tools and manual labor to widen and deepen water areas. It is the project of excavating and processing the underwater mud, sand, stones, etc. within the specified scope and depth in a waterway or port water area. Dredging engineering is one of the main means for developing, improving, and maintaining waterways and port water areas.

[0003] Various types of dredgers are the most commonly used dredging equipment in dredging engineering. Various types of dredgers excavate underwater rock and soil through the cutter teeth of the cutter head, the drag teeth of the drag head, the bucket teeth of the bucket, or the grab bucket teeth. During the excavation process, various teeth are in direct contact with the underwater rock and soil. When various teeth are worn to a certain extent, new teeth need to be replaced and installed on the tooth seat to protect the main body structure of the excavating equipment. As the depth that needs to be excavated in the port becomes deeper and deeper, the strength and hardness of the excavated rock and soil are also increasing, and the impact force on various teeth is more intense, resulting in an increasing number of situations where the teeth break and fall off the tooth seat. This situation is most prominent when a cutter suction dredger excavates rock. The cutter teeth of the cutter head impact the rock at a high frequency and with high intensity, resulting in serious problems such as cutter tooth wear, fracture, and shedding.

[0004] To address the above problems and reduce the possibility of tooth shedding and improve the reliability of the connection form between the cutter teeth and the tooth seat, each dredging equipment manufacturer has developed new connection methods for the cutter teeth and the tooth seat. Some use a threaded hook structure, some use a threaded push structure, and some use an eccentric self-locking structure. During the process of developing new connection forms, it is impossible to conduct full-scale ship tests every time. Therefore, in order to simulate the impact force that the cutter teeth receive during the excavation process, there is an urgent need to design and develop an impact test device for testing the connection reliability of dredging cutter teeth for laboratory use. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides an impact test device for testing the connection reliability of dredging cutter teeth to solve the problem of testing the reliability of the connection form between the cutter teeth and the tooth seat in the laboratory, replace the full-scale ship test in the intermediate process of research and development, reduce the test cost, and improve the test efficiency. This device can be used to test the reliability of the connection form between dredging cutter teeth (drag teeth) and the tooth seat, and can also be used to test the reliability of the connection form between the bucket teeth and the tooth seat used in dredging and land excavation construction machinery grab buckets and buckets.

[0006] The present invention is implemented as follows. An impact test device for testing the connection reliability of dredging cutter teeth includes a fixed bracket, a vertical sliding rod, a power assembly, an eccentric shaft, a connecting rod, a transmission sleeve, an impact rod, a buffer spring, and an impact cushion block;

[0007] The lower part of the fixed bracket is welded to the ground foundation, and a bracket guide hole is provided in the upper part; the vertical sliding rod passes through the bracket guide hole and is fixed to the fixed bracket. The output end of the power assembly is hinged to one end of the eccentric shaft. The eccentric section of the eccentric shaft is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the transmission sleeve. The transmission sleeve is sleeved on the vertical sliding rod through the sleeve side guide holes provided on both sides thereof, so that the transmission sleeve can only move up and down reciprocally under the constraint of the vertical sliding rod;

[0008] A sleeve middle guide hole is provided in the middle of the transmission sleeve. The impact rod is movably installed in the sleeve middle guide hole. The bottom of the impact rod extends outside the transmission sleeve. An upper stop block is provided at the top of the impact rod, and a lower stop block is provided at the lower part of the impact rod; in the sleeve middle guide hole, spaces for the impact rod to move are left above the upper stop block and below the lower stop block; the buffer springs are divided into two buffer springs located above and below. Both of the two buffer springs are sleeved on the impact rod. An open-type sleeve fixed to the transmission sleeve is provided between the upper and lower buffer springs. Accommodation cavities for accommodating the buffer springs are respectively provided on the inner sides of the upper and lower parts of the open-type sleeve, so that the upper and lower buffer springs do not contact each other. The upper and lower buffer springs are pressed under the action of the upper stop block, the open-type sleeve and the lower stop block, driving the impact rod to move up and down reciprocally; the impact cushion block is fixed to the bottom end of the impact rod, so that the impact cushion block directly impacts the test cutter teeth under the drive of the impact rod.

[0009] The power assembly drives the eccentric shaft to rotate. The eccentric shaft drives the transmission sleeve to move up and down reciprocally under the constraint of the vertical sliding rod through the connecting rod. The transmission sleeve drives the impact rod to move up and down reciprocally through the upper and lower buffer springs sleeved on the impact rod. The impact rod receives the acting force of the transmission sleeve and drives the impact cushion block to directly act on the test cutter teeth located below the device.

[0010] Preferably, the fixed bracket is a frame structure composed of rectangular steel pipes, square steel pipes or circular steel pipes; the bracket guide holes are provided in two upper and lower layers.

[0011] Preferably, the power assembly includes a motor, a reduction box and a power base. The motor and the reduction box are fixedly installed on the power base. Both sides of the power base are fixed to the vertical sliding rod. The motor shaft of the motor is connected to the input shaft of the reduction box, and the output shaft of the reduction box is hinged to one end of the eccentric shaft.

[0012] Further preferably, the power base includes a motor base, a reduction gearbox base, and an eccentric shaft support. The motor is installed on the motor base, the reduction gearbox is installed on the reduction gearbox base, the eccentric shaft support is located below the power base, and the eccentric shaft is installed on the eccentric shaft support.

[0013] Further preferably, the voltage of the motor is 220V or 380V, the power is 1 - 8kW, and the rotation speed is 1200 - 3200 r / min; the speed ratio of the reduction gearbox is 1:10 to 1:60; the eccentricity of the eccentric shaft is 20 - 150 mm; the axle distance of the connecting rod is 30 - 200 mm.

[0014] In the above technical solution, preferably, the cross-sectional shapes of the bracket guide hole, the vertical sliding rod, and the sleeve side guide hole are the same, being circular, square, or rectangular.

[0015] In the above technical solution, preferably, the transmission sleeve is hinged to the connecting rod through a hinge support located at its top; the sleeve side guide holes are provided in two layers, respectively located at the upper and middle parts on both sides of the transmission sleeve; the open-type casing is located in the middle of the transmission sleeve.

[0016] In the above technical solution, preferably, the outer diameters of the spring coils of the upper and lower buffer springs are 30 - 150 mm, the wire diameters are 6 - 20 mm, and the free lengths are 30 - 300 mm.

[0017] In the above technical solution, preferably, a cushion block seat body is provided at the bottom end of the impact rod, and the impact cushion block is installed on the cushion block seat body.

[0018] In the above technical solution, preferably, the hardness of the impact cushion block is ≤131 HBS, the elongation at break δ5 ≥ 25%, and the reduction of area ψ ≥ 50%.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are:

[0020] The impact test device for testing the connection reliability of dredging cutter teeth provided by the present invention has a simple structure, low manufacturing cost, is economical and practical, is suitable for testing the connection reliability of dredging cutter teeth and tooth seats in indoor laboratories. Compared with in-situ ship testing, it has the advantages of low testing cost, short cycle, and no impact on construction operations. Description of the Drawings

[0021] Figure 1 is the assembly schematic diagram of the impact test device provided by the embodiment of the present invention;

[0022] Figure 2 is the partial enlarged schematic diagram of the impact test device provided by the embodiment of the present invention;

[0023] Figure 3 This is an exploded schematic view of the impact test device provided by an embodiment of the present invention.

[0024] In the figure, 1 is a fixed bracket; 2 is a motor; 3 is a speed reducer; 4 is a power base; 5 is an eccentric shaft; 6 is a connecting rod; 7 is a transmission sleeve; 8 is a buffer spring; 9 is an impact rod; 10 is an impact pad; 11 is a bracket guide hole; 41 is a speed reducer base; 42 is a motor base; 43 is an eccentric shaft support; 44 is a vertical slide bar; 71 is a hinge support; 72 is a sleeve side guide hole; 73 is a sleeve middle guide hole; 74 is an open casing; 91 is a rod body; 92 is an upper stop block; 93 is a lower stop block; 94 is a pad seat body. Specific embodiments

[0025] In order to further understand the content, features and effects of the present invention, the following embodiments are cited and described in detail with reference to the accompanying drawings as follows:

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] Embodiment

[0029] As Figures 1 to 3 shown, an embodiment of the present invention provides an impact test device for testing the connection reliability of dredging cutter teeth, including a fixed bracket 1, a vertical slide bar 44, a power assembly, an eccentric shaft 5, a connecting rod 6, a transmission sleeve 7, an impact rod 9, a buffer spring 8 and an impact pad 10.

[0030] The lower part of the fixed bracket 1 is welded to the ground foundation, and the upper part is provided with a bracket guide hole 11 for restricting the vertical slide bar 44. The bracket guide hole 11 is provided with two upper and lower layers; the fixed bracket 1 is a frame structure composed of rectangular steel pipes, square steel pipes or circular steel pipes. The vertical slide bar 44 passes through the bracket guide hole 11 and is fixed on the fixed bracket 1.

[0031] The power assembly includes a motor 2, a speed reducer 3 and a power base 4. Both sides of the power base 4 are fixed on the vertical sliding rods 44. The power base 4 includes a motor base 42, a speed reducer base 41 and an eccentric shaft support 43. The motor 2 is installed on the motor base 42, the speed reducer 3 is installed on the speed reducer base 41, the eccentric shaft support 43 is located below the power base 4, and the eccentric shaft 5 is installed on the eccentric shaft support 43. The motor shaft of the motor 2 is connected to the input shaft of the speed reducer 3, the output shaft of the speed reducer 3 is hinged to one end of the eccentric shaft 5, the eccentric section of the eccentric shaft 5 is hinged to one end of the connecting rod 6, and the other end of the connecting rod 6 is hinged to the transmission sleeve 7.

[0032] The voltage of the motor 2 is 220V or 380V, the power is 1 - 8kW, and the speed is 1200 - 3200r / min. The speed ratio of the speed reducer 3 is 1:10 to 1:60. The eccentricity of the eccentric shaft 5 is 20 - 150mm. The axle distance of the connecting rod 6 is 30 - 200mm.

[0033] The transmission sleeve 7 includes a hinge support 71 at the top, sleeve side guide holes 72 for restricting the movement of the transmission sleeve 7, sleeve middle guide holes 73 for restricting the impact rod 9, and an open - type sleeve 74 for accommodating the buffer spring 8; the hinge support 71 is hinged to one end of the connecting rod 6; the sleeve side guide holes 72 are provided in two layers, located at the upper and middle parts on both sides of the transmission sleeve 7 respectively. The transmission sleeve 7 is sleeved on the vertical sliding rods 44 through the sleeve side guide holes 72 provided on both sides of it, so that the transmission sleeve 7 can only move up and down reciprocally under the restraint of the vertical sliding rods 44. Both the support guide holes 11 and the sleeve side guide holes 72 are provided in two upper and lower layers. When the vertical sliding rods 44 pass through the support guide holes 11 and the sleeve side guide holes 72, they pass through each hole in the form of support guide hole 11, sleeve side guide hole 72, support guide hole 11, sleeve side guide hole 72 in an alternating manner. The cross - sectional shapes of the support guide holes 11, the vertical sliding rods 44 and the sleeve side guide holes 72 are the same, being circular, square or rectangular. The sleeve middle guide hole 73 is located in the middle of the transmission sleeve 7; the open - type sleeve 74 is located in the middle of the sleeve middle guide hole 73 and is fixed on the transmission sleeve 7. Accommodating cavities for accommodating the buffer spring 8 are respectively provided on the inner sides of the upper and lower parts of the open - type sleeve 74.

[0034] The impact rod 9 includes a rod body 91, an upper stopper 92, a lower stopper 93, and a cushion block seat body 94. The rod body 91 is movably installed in the middle guide hole 73 of the sleeve. The bottom of the rod body 91 extends outside the transmission sleeve 7. The upper stopper 92 is arranged at the top of the rod body 91, and the lower stopper 93 is arranged at the lower part of the rod body 91. In the middle guide hole 73 of the sleeve, spaces for the movement of the impact rod 9 are left above the upper stopper 92 and below the lower stopper 93. The cushion block seat body 94 is located at the bottom end of the rod body 91.

[0035] The buffer spring 8 is divided into two buffer springs 8 located above and below. The upper and lower buffer springs 8 are both sleeved on the rod body 91. The buffer spring 8 located above is located between the open-type sleeve 74 and the upper stopper 92 and is compressed. The buffer spring 8 located below is located between the open-type sleeve 74 and the lower stopper 93 and is compressed. The upper and lower buffer springs 8 do not contact. The impact rod 9 receives the acting force of the transmission sleeve 7 and drives the impact rod 9 to reciprocate up and down through the upper and lower buffer springs 8. The outer diameters of the springs of the upper and lower buffer springs 8 are 30 - 150 mm, the wire diameters are 6 - 20 mm, and the free lengths are from 30 to 300 mm.

[0036] The impact cushion block 10 is installed on the cushion block seat body 94, so that the impact cushion block 10 directly impacts the test cutter teeth under the drive of the impact rod 9. The hardness of the impact cushion block 10 is ≤ 131 HBS, the elongation at break δ5 ≥ 25%, and the reduction of area ψ ≥ 50%. The impact cushion block 10 has good impact toughness and ductility.

[0037] The specific working process of the present invention is as follows:

[0038] The motor 2 and the reduction gearbox 3 drive the eccentric shaft 5 to rotate. The eccentric shaft 5 drives the transmission sleeve 7 to reciprocate up and down under the constraint of the vertical slide bar 44 through the connecting rod 6. The transmission sleeve 7 drives the impact rod 9 to reciprocate up and down through the upper and lower buffer springs 8 sleeved on the impact rod 9. The impact rod 9 receives the acting force of the transmission sleeve 7 and drives the impact cushion block 10 to directly act on the test cutter teeth located below the device.

[0039] The above description is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention all fall within the scope of the technical solution of the present invention.

Claims

1. An impact test device for testing the connection reliability of dredging cutter teeth, characterized in that It includes a fixed bracket, a vertical sliding rod, a power assembly, an eccentric shaft, a connecting rod, a transmission sleeve, an impact rod, a buffer spring and an impact cushion block; The lower part of the fixed bracket is welded to the ground foundation, and the upper part is provided with a bracket guiding hole; the vertical sliding rod passes through the bracket guiding hole and is fixed on the fixed bracket. The output end of the power assembly is hinged to one end of the eccentric shaft. The eccentric section of the eccentric shaft is hinged to one end of the connecting rod. The other end of the connecting rod is hinged to the transmission sleeve. The transmission sleeve is sleeved on the vertical sliding rod through the sleeve side guiding holes provided on both sides thereof, so that the transmission sleeve can only make reciprocating up and down movements under the constraint of the vertical sliding rod; A sleeve middle guiding hole is provided in the middle of the transmission sleeve. The impact rod is movably installed in the sleeve middle guiding hole. The bottom of the impact rod extends outside the transmission sleeve. An upper stop block is provided at the top of the impact rod, and a lower stop block is provided at the lower part of the impact rod; in the sleeve middle guiding hole, spaces for the movement of the impact rod are left above the upper stop block and below the lower stop block; the buffer spring is divided into two buffer springs located above and below. Both of the two buffer springs are sleeved on the impact rod. An open-type sleeve fixed on the transmission sleeve is provided between the upper and lower buffer springs. Accommodation cavities for accommodating the buffer springs are respectively provided on the inner sides of the upper and lower parts of the open-type sleeve, so that the upper and lower buffer springs do not contact. The upper and lower buffer springs are pressed tightly under the action of the upper stop block, the open-type sleeve and the lower stop block, driving the impact rod to make reciprocating up and down movements; the impact cushion block is fixed at the bottom end of the impact rod, so that the impact cushion block directly impacts the test cutter teeth under the drive of the impact rod; The fixed bracket is a frame structure composed of rectangular steel pipes, square steel pipes or round steel pipes; the bracket guiding holes are arranged in two upper and lower layers; The power assembly includes a motor, a speed reducer and a power base. The motor and the speed reducer are fixedly installed on the power base. Both sides of the power base are fixed on the vertical sliding rod. The motor shaft of the motor is connected to the input shaft of the speed reducer. The output shaft of the speed reducer is hinged to one end of the eccentric shaft.

2. The impact test device for testing the connection reliability of dredging cutter teeth according to claim 1, characterized in that The power base includes a motor base, a speed reducer base and an eccentric shaft support. The motor is installed on the motor base. The speed reducer is installed on the speed reducer base. The eccentric shaft support is located below the power base. The eccentric shaft is installed on the eccentric shaft support.

3. The impact test device for testing the connection reliability of dredging cutter teeth according to claim 1, characterized in that, The voltage of the motor is 220V or 380V, the power is 1 - 8kW, and the speed is 1200 - 3200r / min; the speed ratio of the speed reducer is 1:10 to 1:60; the eccentricity of the eccentric shaft is 20 - 150mm; the axle distance of the connecting rod is 30 - 200mm.

4. The impact test device for testing the connection reliability of dredging cutter teeth according to claim 1, characterized in that, The cross-sectional shapes of the bracket guiding hole, the vertical sliding rod and the sleeve side guiding hole are the same, being circular, square or rectangular.

5. The impact test device for testing the connection reliability of dredging cutter teeth according to claim 1, characterized in that, The transmission sleeve is hinged to the connecting rod through a hinge support located at its top; the sleeve side guiding holes are provided in two layers, respectively located at the upper and middle parts on both sides of the transmission sleeve; the open-type sleeve is located in the middle of the transmission sleeve.

6. The impact test device for testing the connection reliability of dredging cutter teeth according to claim 1, characterized in that, The outer diameters of the upper and lower buffer springs are 30 - 150 mm, the wire diameters are 6 - 20 mm, and the free lengths are 30 - 300 mm.

7. The impact test device for testing the connection reliability of dredging cutter teeth according to claim 1, characterized in that, A cushion block seat body is arranged at the bottom end of the impact rod, and the impact cushion block is installed on the cushion block seat body.

8. The impact test device for testing the connection reliability of dredging cutter teeth according to claim 1, wherein, The hardness of the impact cushion block is ≤ 131 HBS, the elongation at break δ5 ≥ 25%, and the reduction of area ψ ≥ 50%.

Images