A kind of over-torque protection device for mud scraper

Abstract

The present invention belongs to the technical field of over-torque protection for scrapers, and provides an over-torque protection device for scrapers, including a motor, wherein the motor is fixedly connected to a fixing frame, the output shaft of the motor is fixedly connected to a rotating shaft, a sleeve is provided on the outside of the rotating shaft, a fixing sleeve is fixedly connected to the bottom of the rotating shaft, the top surface of the fixing sleeve is a rubber pad, a telescopic sleeve is provided inside the fixing sleeve, the telescopic sleeve is provided on the outside of the rotating shaft, one end of the telescopic sleeve is fixedly connected to the fixing sleeve, the other end of the telescopic sleeve is rotatably connected to the sleeve, and a connecting mechanism is provided between the rotating shaft and the top of the sleeve. In the present invention, when the external load to which all scrapers are subjected exceeds the set pressure value, the card block is stuck in the card slot, the No. 1 toothed disc is disengaged from the No. 2 toothed disc, and the fixation between the rotating shaft and the sleeve is released; the pressure sensor is pressurized, and at this time the control module controls the motor to stop rotating, thereby protecting the motor.

Description

Technical Field

[0001] The invention belongs to the technical field of over-torque protection for mud scrapers, and in particular relates to an over-torque protection device for mud scrapers. Background Art

[0002] A sludge scraper is a machine that cleans silt from a river channel. It is used in large-diameter circular sedimentation tanks in urban sewage treatment plants, water plants, and industrial wastewater treatment to remove sludge settled at the bottom of the tank and skim off scum on the surface of the tank.

[0003] The scraper has a large number of scrapers, all of which are connected to a central shaft. The existing scraper over-torque protection device generally releases the central shaft and the output shaft of the motor when the external load is too large, thereby protecting the drive device, transmission mechanism and scrapers from over-torque.

[0004] However, in the above scheme, after the central rotating shaft of the scraper and the output shaft of the motor are unfixed, the scraper still rotates at high speed under the action of inertia, and the scraper has a large degree of freedom at this time, which is easy to cause vibration damage; on the other hand, due to the different sludge densities in different areas of the sedimentation tank, the resistance encountered by each scraper is different, which may easily cause a single scraper to be subjected to excessive force and break before the central rotating shaft of the scraper and the output shaft of the motor are unfixed, and the over-torque protection of the scraper over-torque protection device has a lag. Summary of the invention

[0005] The object of the present invention is to provide a mud scraper over-torque protection device, aiming to solve the technical problem that the over-torque protection of the mud scraper over-torque protection device in the prior art has hysteresis.

[0006] The present invention is implemented in this way. A mud scraper over-torque protection device comprises a motor, the motor is fixedly connected to a fixing frame, the output shaft of the motor is fixedly connected to a rotating shaft, a sleeve is provided on the outer sleeve of the rotating shaft, a fixing sleeve is fixedly connected to the bottom of the rotating shaft, the top surface of the fixing sleeve is a rubber pad, a telescopic sleeve is provided inside the fixing sleeve, the telescopic sleeve is provided on the outer side of the rotating shaft, one end of the telescopic sleeve is fixedly connected to the fixing sleeve, the other end of the telescopic sleeve is rotatably connected to the sleeve, a connecting mechanism is provided between the rotating shaft and the top of the sleeve, the connecting mechanism is used to elastically limit the sleeve, a rubber sleeve is provided in the connecting mechanism, a hydraulic mechanism is provided in the rotating shaft, the hydraulic mechanism is connected to the telescopic sleeve and the rubber sleeve, and the hydraulic mechanism can adjust the hydraulic pressure in the telescopic sleeve and the rubber sleeve;

[0007] The side wall of the sleeve is provided with a plurality of buffer mechanisms, each of which is provided with a sliding seat, and the buffer mechanism can limit the sliding seat horizontally and vertically, the sliding seat is fixedly connected with a cross bar, the cross bar is rotatably connected with a rotating rod, a limiting mechanism for elastically limiting the rotating rod is provided between the cross bar and the rotating rod, and the rotating rod is fixedly connected with a scraper;

[0008] Control system, when the external load on all scrapers exceeds the set pressure value, the connecting mechanism releases the connection between the rotating shaft and the sleeve. At the same time, the control system can control the start of the hydraulic mechanism to lower the height of the sleeve, and the fixed sleeve pushes all the cross bars on the sleeve to move upward, so that the cross bars drive the scrapers out of contact with the ground.

[0009] Further technical solution: the connecting mechanism includes a first toothed disc, a first spring, a second toothed disc, a boss and a positioning assembly;

[0010] The No. 1 toothed disc is vertically slidably connected to the outer wall of the rotating shaft, a boss is fixedly connected to the side wall of the rotating shaft, a No. 1 spring is arranged between the boss and the No. 1 toothed disc, a positioning assembly is arranged on the inner side of the No. 1 toothed disc, when the No. 1 toothed disc moves up to a certain distance along the rotating shaft, the positioning assembly can be fixedly locked with the rotating shaft, a No. 2 toothed disc is fixedly connected to the top of the sleeve, the No. 2 toothed disc can mesh with the tooth block on the bottom surface of the No. 1 toothed disc, a rubber sleeve is arranged on the bottom surface of the No. 1 toothed disc, and the rubber sleeve is connected to the hydraulic mechanism through a hose.

[0011] Further technical solution: the positioning assembly includes a clamping block, a second spring and a clamping slot;

[0012] A groove is provided on the inner wall of the No. 1 gear disc, a clamping block is slidably provided in the groove, a No. 2 spring is provided between the clamping block and the inner wall of the groove, a clamping groove is provided on the outer wall of the rotating shaft, and when the No. 1 gear disc slides up along the rotating shaft, the clamping block can be clamped and fixed in the clamping groove.

[0013] Further technical solution: the hydraulic mechanism includes a hydraulic chamber, a mechanism chamber and a hydraulic pump;

[0014] The shaft is provided with a hydraulic cavity vertically, a mechanism cavity is provided in the middle of the shaft, a hydraulic pump is provided in the mechanism cavity, the hydraulic pump is communicated with the hydraulic cavities on both sides of the mechanism cavity, and the telescopic sleeve and the rubber sleeve are respectively connected with the hydraulic cavity through a hose.

[0015] Further technical solution: the buffer mechanism includes a vertical limit frame, a horizontal limit frame, an elastic limit rod, a No. 3 spring and a push plate;

[0016] The vertical limit frame is vertically fixed on the outer wall of the sleeve, the vertical limit frame is horizontally connected to the horizontal limit frame, an elastic limit rod is fixedly arranged on the inner top surface of the vertical limit frame, the side end surface of the horizontal limit frame is connected to a push plate through a No. 3 spring, the push plate is horizontally slidably connected to the side wall of the horizontal limit frame, and the sliding seat is slidably connected in the vertical limit frame.

[0017] Further technical solution: the limiting mechanism includes a tooth block, a third toothed disc, a fourth spring and a spring stop seat;

[0018] The cross bar is slidably connected with the No. 3 toothed disc along the length direction, and the end face of the rotating rod facing the No. 3 toothed disc is provided with a plurality of tooth blocks, all of which can engage with the No. 3 toothed disc, and the cross bar is threadedly connected with a spring stop seat, and a No. 4 spring is provided between the spring stop seat and the No. 3 toothed disc.

[0019] Further technical solution: The control system includes:

[0020] A pressure monitoring module, comprising a pressure sensor, wherein the card slot is provided with a pressure sensor;

[0021] A judgment module, which is used to compare the pressure value of the pressure sensor with a preset pressure threshold and form judgment information;

[0022] The control module is used to receive the judgment information and control the motor and the hydraulic mechanism.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. When the external load on all scrapers exceeds the set pressure value, the card block is stuck in the card slot, the No. 1 gear plate is out of contact with the No. 2 gear plate, and the fixation between the shaft and the sleeve is released; the pressure sensor is pressurized, and the pressure sensor exceeds the preset pressure threshold. At this time, the control module controls the motor to stop rotating, thereby protecting the motor;

[0025] 2. The control module simultaneously controls the hydraulic pump to introduce the hydraulic oil on the lower side of the mechanism cavity to the upper side of the mechanism cavity. At this time, the telescopic sleeve contracts, the rubber sleeve expands, and the sleeve moves downward as the telescopic sleeve contracts. While the rubber sleeve elastically limits the sleeve vertically, the rubber sleeve and the telescopic sleeve together apply extrusion force to the sleeve to reduce the inertia force of the sleeve and prevent the sleeve from continuing to rotate after being driven by the shaft. The height of the sleeve moves downward so that the shaft and the sleeve are completely out of contact. When the sleeve descends, the crossbar drives the scraper to break away from contact with the ground, thereby reducing the friction between the scraper and the ground.

[0026] 3. When a single scraper is subjected to force, the scraper drives the rotating rod to rotate relative to the cross rod. After the scraper rotates, it tilts relative to the vertical direction, so that the scraper's interception area for the sludge is reduced, thereby preventing the scraper from being compressed and broken; when the scraper is tilted, the sludge generates an upward thrust on the scraper, and the scraper drives the sliding seat to move upward. At this time, the elastic limit rod elastically buffers the sliding seat until the elastic limit rod is compressed to the limit. At this time, the sliding seat enters the horizontal limit frame, and the No. 3 spring pushes the push plate to elastically limit the sliding seat, so that the scraper and the sleeve are elastically buffered, thereby protecting the sleeve and the transmission components between the scraper.

[0027] 4. When the sleeve moves downward, all cross bars contact the rubber pads on the upper part of the fixed sleeve. Under the action of inertia, the sleeve drives all cross bars to continue to rotate, and the rubber pads on the upper part of the fixed sleeve decelerate all cross bars by friction, so that all scrapers stop quickly; when the sleeve moves downward, the fixed sleeve pushes all cross bars, so that all sliding seats slide upward along the vertical limit frame, the pressure of the elastic limit rod on the sliding seat increases, and the friction between the rubber pads on the upper part of the fixed sleeve and the cross bars increases. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 It is a structural schematic diagram of the connecting mechanism in the present invention.

[0030] Figure 3 It is a structural schematic diagram of the hydraulic mechanism in the present invention.

[0031] Figure 4 for Figure 3 A magnified schematic diagram of area A in the middle.

[0032] Figure 5 It is a schematic diagram of the connection between the telescopic sleeve and the hydraulic mechanism in the present invention.

[0033] Figure 6 It is a schematic diagram of the connection between the sleeve and the buffer mechanism in the present invention.

[0034] Figure 7 It is a structural schematic diagram of the buffer mechanism in the present invention.

[0035] Figure 8 It is a schematic diagram of the connection between the cross bar and the rotating rod in the present invention.

[0036] Fig. 9 for Figure 8 A magnified schematic diagram of area B.

[0037] In the accompanying drawings: 1. motor; 2. rotating shaft; 3. sleeve; 4. hydraulic mechanism; 41. hydraulic chamber; 42. mechanism chamber; 43. hydraulic pump; 5. connecting mechanism; 51. No. 1 toothed disc; 52. No. 1 spring; 53. No. 2 toothed disc; 54. boss; 55. positioning assembly; 551. clamping block; 552. No. 2 spring; 553. clamping slot; 6. buffer mechanism; 61. vertical limit frame; 62. horizontal limit frame; 63. elastic limit rod; 64. No. 3 spring; 65. push plate; 7. sliding seat; 8. limiting mechanism; 81. tooth block; 82. No. 3 toothed disc; 83. No. 4 spring; 84. spring stop seat; 9. rotating rod; 10. scraper; 11. fixing frame; 12. fixing sleeve; 13. telescopic sleeve; 14. rubber sleeve; 15. cross bar. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0040] like Figure 1-Figure 9 As shown, a scraper over-torque protection device provided by the present invention comprises a motor 1, wherein the motor 1 is fixedly connected to a fixing frame 11, the output shaft of the motor 1 is fixedly connected to a rotating shaft 2, the external part of the rotating shaft 2 is sleeved with a sleeve 3, the bottom of the rotating shaft 2 is fixedly connected to a fixing sleeve 12, the top surface of the fixing sleeve 12 is a rubber pad, a telescopic sleeve 13 is arranged inside the fixing sleeve 12, the telescopic sleeve 13 is sleeved on the external part of the rotating shaft 2, one end of the telescopic sleeve 13 is fixedly connected to the fixing sleeve 12, the other end of the telescopic sleeve 13 is rotatably connected to the sleeve 3, a connecting mechanism 5 is arranged between the rotating shaft 2 and the top of the sleeve 3, the connecting mechanism 5 is used for elastically limiting the sleeve 3, a rubber sleeve 14 is arranged in the connecting mechanism 5, a hydraulic mechanism 4 is arranged in the rotating shaft 2, the hydraulic mechanism 4 is connected to the telescopic sleeve 13 and the rubber sleeve 14, and the hydraulic mechanism 4 can adjust the hydraulic pressure in the telescopic sleeve 13 and the rubber sleeve 14;

[0041] The side wall of the sleeve 3 is provided with a plurality of buffer mechanisms 6, each of which is provided with a sliding seat 7, and the buffer mechanism 6 can limit the sliding seat 7 horizontally and vertically, and the sliding seat 7 is fixedly connected with a cross bar 15, and the cross bar 15 is rotatably connected with a rotating rod 9, and a limiting mechanism 8 for elastically limiting the rotating rod 9 is provided between the cross bar 15 and the rotating rod 9, and the rotating rod 9 is fixedly connected with a scraper 10;

[0042] Control system, when the external load on all scrapers 10 exceeds the set pressure value, the connecting mechanism 5 releases the connection between the rotating shaft 2 and the sleeve 3, and the control system can control the hydraulic mechanism 4 to lower the height of the sleeve 3, and the fixed sleeve 12 pushes all the cross bars 15 on the sleeve 3 to move up, so that the cross bars 15 drive the scrapers 10 to break away from contact with the ground.

[0043] In this embodiment, when in use, the device is fixed in the center of the sedimentation tank to be cleaned, the motor 1 is started, the motor 1 drives the rotating shaft 2 to rotate, and under the support of the telescopic sleeve 13, the sleeve 3 is connected and fixed to the rotating shaft 2 through the connecting mechanism 5, so that the rotating shaft 2 drives the sleeve 3 to rotate synchronously, and the sleeve 3 drives all the sliding seats 7 to move synchronously through all the buffer mechanisms 6. Under the connection of the cross bar 15 and the rotating rod 9, the sliding seat 7 drives all the scrapers 10 to perform circular motion, and all the scrapers 10 clean the sludge at the bottom of the sedimentation tank;

[0044] At the bottom of the sedimentation tank, all the silt forms resistance to each scraper 10, and the resistance on each scraper 10 acts on the shaft 2 and the motor 1 through the sleeve 3. When the external load on all the scrapers 10 exceeds the set pressure value, the connecting mechanism 5 releases the connection between the shaft 2 and the sleeve 3, and the control system starts the motor 1 to stop rotating, thereby protecting the motor 1; at this time, the control system can simultaneously control the start of the hydraulic mechanism 4, and the hydraulic mechanism 4 will lead out the hydraulic oil in the telescopic sleeve 13, and the telescopic sleeve 13 will shrink. At this time, the height of the sleeve 3 moves down, and the sleeve 3 is completely separated from the connecting mechanism 5; when the sleeve 3 descends, the fixed sleeve 12 pushes all the cross bars 15 on the sleeve 3 to move up, so that the cross bars 15 drive the scrapers 10 to break away from the contact with the ground, thereby reducing the friction between the scrapers 10 and the ground;

[0045] The limiting mechanism 8 elastically limits each scraper 10. When the scraper 10 encounters a large resistance, the scraper 10 pushes the rotating rod 9 to rotate relative to the cross bar 15. The interception area of ​​the scraper 10 for the sludge is reduced, thereby reducing the resistance of the sludge to the scraper 10, thereby achieving over-torque protection for a single scraper 10.

[0046] like Figure 2 and Figure 3 As shown, a mud scraper over-torque protection device provided by the present invention is provided, wherein the connecting mechanism 5 comprises a first toothed disc 51, a first spring 52, a second toothed disc 53, a boss 54 and a positioning assembly 55;

[0047] The No. 1 toothed disc 51 is vertically slidably connected to the outer wall of the rotating shaft 2, and a boss 54 is fixedly connected to the side wall of the rotating shaft 2. A No. 1 spring 52 is arranged between the boss 54 and the No. 1 toothed disc 51. A positioning assembly 55 is arranged on the inner side of the No. 1 toothed disc 51. When the No. 1 toothed disc 51 moves up to a certain distance along the rotating shaft 2, the positioning assembly 55 can be fixedly locked with the rotating shaft 2. A No. 2 toothed disc 53 is fixedly connected to the top of the sleeve 3, and the No. 2 toothed disc 53 can mesh with the tooth block 81 on the bottom surface of the No. 1 toothed disc 51. A rubber sleeve 14 is arranged on the bottom surface of the No. 1 toothed disc 51, and the rubber sleeve 14 is connected to the hydraulic mechanism 4 through a hose.

[0048] In this embodiment, under the elastic thrust of the No. 1 spring 52, the No. 1 toothed disc 51 meshes with the No. 2 toothed disc 53, and the sleeve 3 is fixedly connected relative to the rotating shaft 2. When the motor 1 drives the rotating shaft 2 to rotate, the rotating shaft 2 drives the sleeve 3 to rotate synchronously.

[0049] Under the action of the resistance of the silt, the sleeve 3 together with all the scrapers 10 are subjected to a thrust in the opposite direction to the rotation direction of the shaft 2. The sleeve 3 drives the No. 2 toothed disc 53 to squeeze the No. 1 toothed disc 51. Under the mutual squeezing action of the No. 2 toothed disc 53 and the No. 1 toothed disc 51, the No. 1 toothed disc 51 slides upward along the shaft 2. At this time, the No. 1 spring 52 elastically contracts. When the external load commonly borne by all the scrapers 10 exceeds the preset pressure threshold, the positioning assembly 55 can be fixedly stuck to the shaft 2, the No. 1 toothed disc 51 is disengaged from the No. 2 toothed disc 53, the fixation between the shaft 2 and the sleeve 3 is released, and at the same time, the control system controls the motor 1 to stop rotating, thereby protecting the motor 1.

[0050] like Figure 4 As shown, a mud scraper over-torque protection device provided by the present invention is provided, wherein the positioning assembly 55 comprises a clamping block 551, a second spring 552 and a clamping groove 553;

[0051] A groove is provided on the inner wall of the No. 1 gear disc 51, and a clamping block 551 is slidably provided in the groove. A No. 2 spring 552 is provided between the clamping block 551 and the inner wall of the groove. A clamping groove 553 is provided on the outer wall of the rotating shaft 2. When the No. 1 gear disc 51 slides up along the rotating shaft 2, the clamping block 551 can be clamped and fixed with the clamping groove 553.

[0052] In this embodiment, when the No. 1 toothed disc 51 moves up a certain distance along the rotating shaft 2, the block 551 is stuck in the slot 553 under the elastic thrust of the No. 2 spring 552. At this time, the No. 1 toothed disc 51 is fixed to the rotating shaft 2, and the No. 1 toothed disc 51 is out of contact with the No. 2 toothed disc 53.

[0053] like Figure 3 As shown, a mud scraper over-torque protection device provided by the present invention is provided, wherein the hydraulic mechanism 4 includes a hydraulic chamber 41, a mechanism chamber 42 and a hydraulic pump 43;

[0054] The shaft 2 is vertically provided with a hydraulic cavity 41, the middle portion of the shaft 2 is separated with a mechanism cavity 42, a hydraulic pump 43 is provided in the mechanism cavity 42, the hydraulic pump 43 is communicated with the hydraulic cavities 41 on both sides of the mechanism cavity 42, and the telescopic sleeve 13 and the rubber sleeve 14 are respectively connected with the hydraulic cavity 41 through a hose.

[0055] In this embodiment, when the first toothed disc 51 is out of contact with the second toothed disc 53, the hydraulic pump 43 introduces the hydraulic oil on the lower side of the mechanism cavity 42 to the upper side of the mechanism cavity 42. At this time, the telescopic sleeve 13 contracts, the rubber sleeve 14 expands, and the sleeve 3 moves downward with the contraction of the telescopic sleeve 13. At this time, the rubber sleeve 14 elastically squeezes the upper part of the sleeve 3. While the rubber sleeve 14 elastically limits the sleeve 3 vertically, the rubber sleeve 14 and the telescopic sleeve 13 together apply a squeezing force to the sleeve 3, reducing the inertia force of the sleeve 3, and preventing the sleeve 3 from continuing to rotate after being separated from the drive of the rotating shaft 2;

[0056] Under the action of the hydraulic oil, when the rotating shaft 2 and the sleeve 3 are relatively fixed, the hydraulic oil in the hydraulic chamber 41 can cool down the rotating shaft 2 and the sleeve 3 to prevent the rotating shaft 2 and the sleeve 3 from being deformed by heat due to long-term rotation; when the No. 1 toothed disc 51 and the No. 2 toothed disc 53 are out of contact, the sleeve 3 can be driven downward under the action of the hydraulic mechanism 4, so that the rotating shaft 2 and the sleeve 3 are completely out of contact, avoiding friction between the No. 1 toothed disc 51 and the No. 2 toothed disc 53; further, under the action of the hydraulic mechanism 4, the rubber sleeve 14 and the telescopic sleeve 13 together apply an extrusion force to the sleeve 3 to reduce the inertia force of the sleeve 3.

[0057] like Figure 7 As shown, a mud scraper over-torque protection device provided by the present invention is provided, wherein the buffer mechanism 6 comprises a vertical limit frame 61, a horizontal limit frame 62, an elastic limit rod 63, a third spring 64 and a push plate 65;

[0058] The vertical limit frame 61 is vertically fixed on the outer wall of the sleeve 3, and the vertical limit frame 61 is horizontally connected to the horizontal limit frame 62. An elastic limit rod 63 is fixedly arranged on the inner top surface of the vertical limit frame 61. The side end surface of the horizontal limit frame 62 is connected to a push plate 65 through a No. 3 spring 64. The push plate 65 is horizontally slidably connected to the side wall of the horizontal limit frame 62, and the sliding seat 7 is slidably connected in the vertical limit frame 61.

[0059] In this embodiment, when the sleeve 3 moves downward, the sleeve 3 drives all the cross bars 15 to move downward, and all the cross bars 15 contact the rubber pads on the upper part of the fixed sleeve 12. Under the action of inertia force, the sleeve 3 drives all the cross bars 15 to continue to rotate, and the rubber pads on the upper part of the fixed sleeve 12 frictionally decelerate all the cross bars 15, so that all the scrapers 10 stop quickly; when the sleeve 3 moves downward, the fixed sleeve 12 pushes all the cross bars 15 to make all the sliding seats 7 slide upward along the vertical limit frame 61, and the pressure of the elastic limit rod 63 on the sliding seat 7 increases, and the friction between the rubber pads on the upper part of the fixed sleeve 12 and the cross bars 15 increases until the elastic limit rod 63 is compressed to the limit. At this time, the sliding seat 7 enters the horizontal limit frame 62, and the No. 3 spring 64 pushes the push plate 65 to elastically limit the sliding seat 7, so that the scraper 10 and the sleeve 3 are elastically buffered, thereby protecting the transmission components between the sleeve 3 and the scraper 10.

[0060] like Fig. 9 As shown, a mud scraper over-torque protection device provided by the present invention is provided, wherein the limiting mechanism 8 comprises a tooth block 81, a third toothed disc 82, a fourth spring 83 and a spring stop seat 84;

[0061] The cross bar 15 is slidably connected to the No. 3 toothed disc 82 along the length direction, and a plurality of tooth blocks 81 are arranged on the end face of the rotating rod 9 facing the No. 3 toothed disc 82, and all tooth blocks 81 can mesh with the No. 3 toothed disc 82. The cross bar 15 is threadedly connected to a spring stop seat 84, and a No. 4 spring 83 is arranged between the spring stop seat 84 and the No. 3 toothed disc 82.

[0062] In this embodiment, when a single scraper 10 is subjected to force, the scraper 10 drives the rotating rod 9 to rotate relative to the cross bar 15, and the rotating rod 9 drives the tooth block 81 to push the third toothed disc 82, and the third toothed disc 82 slides along the length direction of the cross bar 15, and the third toothed disc 82 squeezes the fourth spring 83. After the scraper 10 rotates, it tilts relative to the vertical direction, so that the interception area of ​​the scraper 10 for the silt is reduced, thereby reducing the pressure of the silt on the scraper 10, and preventing the scraper 10 from being broken under pressure;

[0063] When the scraper 10 is tilted, as the scraper 10 rotates, the silt generates an upward thrust on the scraper 10 , and the scraper 10 drives the sliding seat 7 to move upward through the rotating rod 9 and the cross rod 15 . At this time, the elastic limit rod 63 elastically buffers the scraper 10 .

[0064] The present invention provides a mud scraper over-torque protection device, wherein the control system comprises:

[0065] A pressure monitoring module, which includes a pressure sensor, wherein the card slot 553 is provided with a pressure sensor;

[0066] A judgment module, which is used to compare the pressure value of the pressure sensor with a preset pressure threshold and form judgment information;

[0067] The control module is used to receive the judgment information and control the motor 1 and the hydraulic mechanism 4.

[0068] Working principle:

[0069] At the bottom of the sedimentation tank, all the silt forms resistance to each scraper 10. The resistance on each scraper 10 acts on the shaft 2 and the motor 1 through the sleeve 3. The sleeve 3 and all the scrapers 10 are subjected to a thrust in the opposite direction of the rotation direction of the shaft 2. The sleeve 3 drives the second toothed disc 53 to squeeze the first toothed disc 51. Under the mutual squeezing action of the second toothed disc 53 and the first toothed disc 51, the first toothed disc 51 slides upward along the shaft 2. At this time, the first spring 52 elastically contracts. When the external load on all the scrapers 10 exceeds the set pressure value, the block 551 is stuck in the slot 553, the first toothed disc 51 is out of contact with the second toothed disc 53, and the fixation between the shaft 2 and the sleeve 3 is released; the pressure sensor is pressurized, and the pressure sensor exceeds the preset pressure threshold. At this time, the control module controls the motor 1 to stop rotating, thereby protecting the motor 1;

[0070] The control module simultaneously controls the hydraulic pump 43 to introduce the hydraulic oil on the lower side of the mechanism cavity 42 to the upper side of the mechanism cavity 42. At this time, the telescopic sleeve 13 contracts, the rubber sleeve 14 expands, and the sleeve 3 moves downward with the contraction of the telescopic sleeve 13. At this time, the rubber sleeve 14 elastically squeezes the upper part of the sleeve 3. While the rubber sleeve 14 elastically limits the vertical position of the sleeve 3, the rubber sleeve 14 and the telescopic sleeve 13 apply an extrusion force to the sleeve 3 to reduce the inertia force of the sleeve 3 and prevent the sleeve 3 from continuing to rotate after being separated from the drive of the rotating shaft 2; the height of the sleeve 3 moves downward so that the rotating shaft 2 and the sleeve 3 are completely separated from each other, and friction between the first toothed disc 51 and the second toothed disc 53 is avoided. When the sleeve 3 descends, the fixed sleeve 12 pushes all the cross bars 15 on the sleeve 3 to move upward, so that the cross bars 15 drive the scraper 10 to separate from the contact with the ground, thereby reducing the friction between the scraper 10 and the ground;

[0071] When a single scraper 10 is subjected to force, the scraper 10 drives the rotating rod 9 to rotate relative to the cross rod 15, and the rotating rod 9 drives the tooth block 81 to push the third toothed disc 82, and the third toothed disc 82 slides along the length direction of the cross rod 15, and the third toothed disc 82 squeezes the fourth spring 83. After the scraper 10 rotates, it tilts relative to the vertical direction, so that the interception area of ​​the scraper 10 for the silt is reduced, thereby preventing the scraper 10 from being compressed and broken; when the scraper 10 tilts, as the scraper 10 rotates, the silt generates an upward thrust on the scraper 10, and the scraper 10 drives the sliding seat 7 to move upward through the rotating rod 9 and the cross rod 15. At this time, the elastic limit rod 63 elastically buffers the sliding seat 7 until the elastic limit rod 63 is compressed to the limit, and the sliding seat 7 enters the horizontal limit frame 62. The third spring 64 pushes the push plate 65 to elastically limit the sliding seat 7, so that the scraper 10 and the sleeve 3 are elastically buffered, thereby protecting the transmission components between the sleeve 3 and the scraper 10.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0073] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A mud scraper over-torque protection device, comprising a motor (1), wherein the output shaft of the motor (1) is fixedly connected to a rotating shaft (2), characterized in that: The rotating shaft (2) is sleeved with a sleeve (3) on the outside, a fixed sleeve (12) is fixedly connected to the bottom of the rotating shaft (2), a telescopic sleeve (13) is arranged inside the fixed sleeve (12), the telescopic sleeve (13) is sleeved on the outside of the rotating shaft (2), one end of the telescopic sleeve (13) is fixedly connected to the fixed sleeve (12), and the other end of the telescopic sleeve (13) is rotatably connected to the sleeve (3), a connecting mechanism (5) for elastically limiting the sleeve (3) is arranged between the rotating shaft (2) and the top of the sleeve (3), a rubber sleeve (14) is arranged in the connecting mechanism (5), a hydraulic mechanism (4) is arranged in the rotating shaft (2), the hydraulic mechanism (4) is connected to the telescopic sleeve (13) and the rubber sleeve (14), and the hydraulic mechanism (4) can adjust the hydraulic pressure in the telescopic sleeve (13) and the rubber sleeve (14); The side wall of the sleeve (3) is provided with a plurality of buffer mechanisms (6), each of which is provided with a sliding seat (7), and the buffer mechanism (6) is capable of limiting the sliding seat (7) horizontally and vertically, the sliding seat (7) is fixedly connected to a cross bar (15), the cross bar (15) is rotatably connected to a rotating rod (9), a limiting mechanism (8) for elastically limiting the rotating rod (9) is provided between the cross bar (15) and the rotating rod (9), and the rotating rod (9) is fixedly connected to a scraper (10); The control system is configured such that when the external load on all the scrapers (10) exceeds a set pressure value, the connection mechanism (5) releases the connection between the rotating shaft (2) and the sleeve (3). At the same time, the control system can control the hydraulic mechanism (4) to move the sleeve (3) downward, so that the cross bar (15) drives the scrapers (10) out of contact with the ground.

2. The over-torque protection device for a mud scraper according to claim 1, characterized in that: The connecting mechanism (5) comprises a first toothed disc (51), a first spring (52), a second toothed disc (53), a boss (54) and a positioning assembly (55); The first toothed disc (51) is vertically slidably connected to the outer wall of the rotating shaft (2); a boss (54) is fixedly connected to the side wall of the rotating shaft (2); a first spring (52) is arranged between the boss (54) and the first toothed disc (51); a positioning assembly (55) is arranged on the inner side of the first toothed disc (51); when the first toothed disc (51) moves up to a certain distance along the rotating shaft (2), the positioning assembly (55) can be fixedly locked with the rotating shaft (2); a second toothed disc (53) is fixedly connected to the top of the sleeve (3); the second toothed disc (53) can mesh with a tooth block (81) on the bottom surface of the first toothed disc (51); a rubber sleeve (14) is arranged on the bottom surface of the first toothed disc (51); and the rubber sleeve (14) is connected to the hydraulic mechanism (4) through a hose.

3. The over-torque protection device for a mud scraper according to claim 2, characterized in that: The positioning assembly (55) comprises a clamping block (551), a second spring (552) and a clamping slot (553); A groove is formed on the inner wall of the first toothed disc (51), a clamping block (551) is slidably disposed in the groove, a second spring (552) is disposed between the clamping block (551) and the inner wall of the groove, and a clamping groove (553) is formed on the outer wall of the rotating shaft (2), and when the first toothed disc (51) slides upward along the rotating shaft (2), the clamping block (551) can be clamped and fixed with the clamping groove (553).

4. The over-torque protection device for a mud scraper according to claim 1, characterized in that: The hydraulic mechanism (4) comprises a hydraulic chamber (41), a mechanism chamber (42) and a hydraulic pump (43); The rotating shaft (2) is provided with a hydraulic cavity (41) in the vertical direction, and a mechanism cavity (42) is provided in the middle of the rotating shaft (2). A hydraulic pump (43) is provided in the mechanism cavity (42). The hydraulic pump (43) is communicated with the hydraulic cavities (41) on both sides of the mechanism cavity (42), and the telescopic sleeve (13) and the rubber sleeve (14) are respectively connected with the hydraulic cavity (41) through a hose.

5. The over-torque protection device for a mud scraper according to claim 1, characterized in that: The buffer mechanism (6) comprises a vertical limit frame (61), a horizontal limit frame (62), an elastic limit rod (63), a No. 3 spring (64) and a push plate (65); The vertical limit frame (61) is vertically fixed on the outer wall of the sleeve (3); the vertical limit frame (61) is horizontally connected to the horizontal limit frame (62); an elastic limit rod (63) is fixedly arranged on the inner top surface of the vertical limit frame (61); the side end surface of the horizontal limit frame (62) is connected to a push plate (65) via a No. 3 spring (64); the push plate (65) is horizontally slidably connected to the side wall of the horizontal limit frame (62); and the sliding seat (7) is slidably connected in the vertical limit frame (61).

6. The over-torque protection device for a mud scraper according to claim 1, characterized in that: The limiting mechanism (8) comprises a tooth block (81), a third toothed disc (82), a fourth spring (83) and a spring stop seat (84); The cross bar (15) is slidably connected to a third toothed disc (82) along its length direction; a plurality of tooth blocks (81) are provided on the end surface of the rotating rod (9) facing the third toothed disc (82); all the tooth blocks (81) are capable of meshing with the third toothed disc (82); a spring stop seat (84) is threadedly connected to the cross bar (15); and a fourth spring (83) is provided between the spring stop seat (84) and the third toothed disc (82).

7. The over-torque protection device for a mud scraper according to claim 1, characterized in that: The top surface of the fixing sleeve (12) is a rubber pad.

8. The over-torque protection device for a mud scraper according to claim 3 is characterized in that: The control system comprises: A pressure monitoring module, comprising a pressure sensor, wherein the card slot (553) is provided with a pressure sensor; A judgment module, which is used to compare the pressure value of the pressure sensor with a preset pressure threshold and form judgment information; A control module is used to receive the judgment information and control the motor (1) and the hydraulic mechanism (4).

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