Pile extractor and its clutch

Abstract

An embodiment of the present invention discloses a clutch. The ratchet tooth surface of the clutch ratchet can be connected to the pin shaft of the chain link in a combined / separable manner to access power. Two arm clip driving pins are arranged on the clutch housing and are respectively inserted into the sliding grooves of the corresponding upper jaw arm clips of the clamp, so as to drive the two upper jaw arm clips to slide on the clutch housing and perform limiting. The above clutch is installed on the frame of the pile extractor of the present invention, realizing power access and clamp locking at the same time, and can conveniently and reliably extract small pile bodies, with high cost performance.

Description

Technical Field

[0001] The present invention relates to the technical field of power tools, and in particular to a pile extractor and its clutch, which is particularly suitable for small-scale projects such as garden construction. Background Art

[0002] For occasions such as garden construction, pile extraction operations are often required, that is, square or round piles placed in the soil layer are pulled out of the ground. When extracting the pile, generally a steel wire rope is used to tightly wrap around the pile body, and then the winch is started to wind up the steel wire rope to pull the pile body out of the soil layer. There is a problem that the locking operation of the steel wire rope is not convenient and reliable enough. There are also special pliers for pile extraction, which realize pile extraction through the opening and closing and lifting actions of two clamping arms. During operation, the locking device is required to lock the clamping arms, and then the motor is turned on to drive the clamp to rise and pull out the pile body. Among them, the power for the opening and closing and lifting actions of the pliers needs to be respectively equipped with a driving mechanism, and a locking mechanism needs to be additionally provided for locking the clamping arms of the pliers. Since the power access and locking of the pliers are realized through multiple sets of mechanisms, the equipment structure is complex, the manufacturing cost is relatively high, and the process is relatively complicated. In view of the unsatisfactory power and locking performance of the existing pliers, they cannot be well applied to small-scale project use occasions such as garden construction. Therefore, it is necessary to design a new type of pliers and optimize the structure of the pile extractor on this basis to better meet the needs of market users. Summary of the Invention

[0003] Aiming at the defects existing in the prior art, the present invention provides a convenient and reliable pile extractor and its clutch suitable for garden construction and the like.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides a clutch, including a clutch housing and a clutch pawl. The first end of the clutch pawl is hinged to the clutch housing through a pawl pin. The second end of the clutch pawl has a ratchet surface adapted to the pin shaft of the chain link, and the ratchet surface is connectable / disconnectable to the pin shaft of the chain link to access power. Two arm clamp driving pins are arranged on the clutch housing, and the two clamp driving pins are respectively inserted into the sliding grooves of the two upper jaw arm clamps of the pliers, so as to drive the two upper jaw arm clamps to slide on the clutch housing and be limited.

[0006] Optionally, the clutch housing includes a first clutch housing plate, a second clutch housing plate, a third clutch housing plate and a fourth clutch housing plate. The first clutch housing plate is arranged parallel to and fixed to the second clutch housing plate and the third clutch housing plate, and the fourth clutch housing plate is arranged perpendicular to and fixed to the second clutch housing plate and the third clutch housing plate respectively.

[0007] Two arm clamp drive pins are installed on the first clutch housing plate, and the two arm clamp drive pins are horizontally arranged and inserted into the sliding grooves of the two upper jaw arm clamps of the clamp; and / or, a clutch pawl is clamped between the second clutch housing plate and the third clutch housing plate, and the clutch pawl is rotatably connected to the second clutch housing plate and the third clutch housing plate.

[0008] Optionally, the second clutch housing plate is slidably installed in the track groove of the main housing; and / or, a chain guide plate is vertically fixed between the second clutch housing plate and the third clutch housing plate, the chain passes through between the second clutch housing plate and the third clutch housing plate and is suspended and installed on the main housing; and / or, welding reinforcing ribs are arranged between the second clutch housing plate and the third clutch housing plate to increase the strength.

[0009] Optionally, the clutch is configured with a sliding bar, and limiting plates are respectively arranged at both ends of one side of the sliding bar so that notch slopes are respectively formed at the upper and lower ends of the middle part of the sliding bar to form a sliding bar notch with a notch slope. The sliding bar is movably installed in the clutch housing through the sliding bar notch; the upper end of the clutch pawl has a clutch pawl slope, and the notch slope at the upper end of the sliding bar is adapted to the clutch pawl slope so that when the two come into contact, the clutch pawl can be driven to rotate forward, so that the clutch pawl is separated from the link pin shaft; a clutch pawl slope is arranged on one side of the lower end of the clutch pawl, and the other side of the lower end of the clutch pawl is adapted to the notch slope of the sliding bar at the lower end, so that when the two are in contact, the clutch pawl is driven to rotate reversely, so that the clutch pawl is combined with the link pin shaft.

[0010] Optionally, the sliding bar is configured with a sliding bar limiting block, and the sliding bar limiting block is fixedly installed at the top end of the main housing to limit the upward stroke of the sliding bar.

[0011] Optionally, the top of the chain passes through the clutch housing and is suspended in the main housing, and the bottom of the chain is supported and tensioned by a chain bottom support shaft on the main housing.

[0012] Optionally, the two arm clamp drive pins are symmetrically arranged on both sides of the center line between the two upper jaw arm clamps, and the arc tops of the sliding grooves of the two upper jaw arm clamps respectively face the center line between the two upper jaw arm clamps.

[0013] On this basis, the present invention further provides a pile extractor, which includes a frame, and the above-mentioned clutch is installed on the frame. During operation, power is connected through the clutch to drive the two upper jaw arm clamps of the clamp to clamp the pile to be extracted for pile extraction.

[0014] Optionally, the pile extractor is configured with pile extraction accessories, and the pile extraction accessories include a column, a cross beam and two bottom beams. The cross beam is arranged at the top end of the column to be fixedly connected to the base, and the two bottom beams are arranged in a V shape at the bottom end of the column. By installing the pile extraction accessories in the accessory accommodation cavity of the base of the pile extractor, the pile to be extracted with a height above the ground surface lower than a preset value can be assisted in being clamped.

[0015] Compared with the prior art, the clamp of the present invention is configured with a clutch to selectively access the power of the driving device, and the two upper jaw arms of the drivable clamp slide on the clutch housing and are limited, that is, the power access and the clamp locking are simultaneously achieved through the clutch. The portable pile pulling product adopting the above clutch simplifies the product structure, has a lower equipment price and higher market competitiveness. Description of the Drawings

[0016] Figure 1 Schematic structural diagram of a pile puller equipped with the clamp of the embodiment of the present invention;

[0017] Figure 2 is Figure 1 partial disassembly of the pile puller shown Figure 1 ;

[0018] Figure 3 is Figure 1 partial disassembly of the pile puller shown Figure 2 ;

[0019] Figure 4 is Figure 3 partial disassembly diagram of the clamp and the clutch in

[0020] Figure 5 is Figure 3 schematic diagram of the assembled clamp and the clutch in

[0021] Figure 6 is Figure 5 schematic structural diagram of the clamp shown

[0022] Figure 7 is Figure 5 front view of the clutch shown

[0023] Figure 8 is Figure 5 rear view of the clutch shown

[0024] Figure 9 is Figure 5 left view of the clutch shown

[0025] Figure 10 is Figure 5 right view of the clutch shown

[0026] Figure 11 is Figure 5 top view of the clutch shown

[0027] Figure 12 is Figure 5 bottom view of the clutch shown

[0028] Figure 13 is Figure 9G-G sectional view;

[0029] Figure 14 is Figure 1 Schematic diagram of the pile extractor preparing to extract the pile as shown;

[0030] Figure 15 is Figure 14 Enlarged view of part I in

[0031] Figure 16 is Figure 1 Schematic diagram of the pile extraction process of the pile extractor as shown;

[0032] Figure 17 is Figure 16 Enlarged view of part II in

[0033] Figure 18 is Figure 1 Schematic diagram of the pile extractor extracting the pile when the pile surface is exposed relatively high above the ground as shown;

[0034] Figure 19 is Figure 1 Schematic diagram of the pile extractor extracting the pile when the pile surface is exposed relatively low above the ground as shown;

[0035] Figure 20 is Figure 19 Schematic diagram of the pile extractor when adding pile extraction accessories when the pile surface is exposed relatively low above the ground.

[0036] Above Figures 1 - 20 In the above, the relevant reference numerals are as follows:

[0037] 1. Engine; 2. Driven plate; 3. Circlip for hole (Φ42); 4. Bearing (6004-2RS); 5. Circlip for shaft (Φ20); 6. Driven plate housing; 7. Socket head cap screw (M6X30); 8. Socket head cap screw (M8X25); 9. Reduction gearbox; 10. Driving sprocket; 11. Circlip for hole (Φ110); 12. Bearing (6014-2RS); 13. Circlip for shaft (Φ70); 14. Sprocket housing; 15. Extractor handle; 16. Socket head cap screw (M8X16); 17. Slide bar limit block; 18. Socket head cap screw (M8X16); 19. Main housing; 20. Blind cover; 21. Engine throttle handle; 22. Engine guard; 23. Socket head cap screw (M10X20); 24. Chain; 25. Cover 1; 26. Cross recessed pan head screw (M6X7); 27. Clutch pawl; 28. Clutch housing, 281. Arm clamp drive pin, 282. Clutch housing plate 1, 283. Clutch housing plate 2, 284. Clutch housing plate 3, 285. Clutch housing plate 4, 286. Chain guide plate, 287. Reinforcing rib; 29. Pawl pin; 30. Circlip for shaft (Φ16); 31. Upper jaw arm clamp 1, 311. Slide groove, 312. Arm clamp insert; 32. Upper jaw arm clamp 2, 321. Slide groove, 322. Arm clamp insert; 33. Countersunk head socket screw (M8X12); 34. Lower jaw plate; 35. Slide plate, 351. Base part, 352. Slide part; 36. Jaw plate pin; 37. Slide bar, 371. Slide bar notch, 372. Notch inclined plane, 373. Notch inclined plane; 38. Chain bottom support shaft; 39. Base; 40. Hexagon flange lock nut (M12); 41. Rubber wheel; 42. Rubber wheel mounting shaft; 43. Socket head cap screw (M6X7); 44. Cover 2; 45. Auxiliary extractor parts, 451a. Bottom beam 1, 451b. Bottom beam 2, 452. Column, 453. Cross beam, 454. Auxiliary parts fixing piece; 100. Pile body; L. Clutch; J. Clamp; Q. Driving device. Detailed implementation manners

[0038] The following is a detailed description in combination with the drawings and specific embodiments. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0039] The clamp of the present invention can be applicable to occasions such as pulling out pile bodies in garden engineering, and of course can also be used in other similar application scenarios. The following takes an extractor as an example for a detailed description.

[0040] See alsoFigures 1 - 20 , which shows a schematic structural diagram of a preferred embodiment of a pile puller according to the present invention. This pile puller is a lightweight device for extracting square or round piles from soil. It primarily comprises a frame, chain 24, clutch L, clamp J, and drive unit Q. It utilizes a chain clutch to drive and lock the clamp arm, automatically locking the pile 100 during extraction, facilitating quick and safe pile extraction. This is further described below.

[0041] like Figures 1 - 4 As shown, the machine frame is in the form of a column, with a hollow main housing 19, into which components such as the clutch and chain 24 can be mounted. A slot is provided on one side wall of the main housing 19 to allow passage of the clamp's slide plate and connecting pins. A pile puller handle 15 is fixedly mounted on the top of the main housing 19 for support during pile pulling operations. A base 39 is fixedly mounted on the bottom of the main housing 19 to stabilize the main housing 19 on the ground during pile pulling operations. Rollers are located at the bottom of the main housing 19 for movement, specifically a pair of rubber wheels 41, which facilitate movement of the pile puller.

[0042] In this embodiment, a drive unit Q is mounted on top of the pile puller. It primarily consists of an engine 1, a reduction gearbox 9, and a drive sprocket 10. The sprocket housing 14 of the drive sprocket 10 is fixedly mounted on the top of the main housing 19. The main shaft of the drive sprocket 10 is connected to the engine 1 via the reduction gearbox 9, allowing the drive sprocket 10 to output power. A chain 24 is mounted on the drive sprocket 10 at one end. The other end of the chain 24 passes through a clutch housing 28 and is suspended and tensioned within the main housing 19. The clutch housing 28 is slidably mounted within the main housing. Starting the engine 1 causes the drive sprocket 10 to rotate, driving the chain 24. Furthermore, an engine protection frame 22 is fixedly mounted on the top of the main housing 19. This frame supports the engine 1 to prevent it from falling. The engine also features an engine throttle handle 21 for easy control of the engine 1.

[0043] In this embodiment, the chain 24, clutch L, and clamp J can be mounted in the following structure. The top of the chain 24 is mounted on the drive sprocket 10 and suspended within the main housing 19 of the frame. The bottom of the chain 24 is supported and tensioned by the chain bottom support shaft 38 on the main housing 19. The clutch L is slidably mounted on the main housing 19 and can be clutched and connected to the chain 24 so as to follow the movement of the chain 24. The clamp J is slidably mounted on the main housing 19 and can be slidably connected to the clutch L in a limited manner to drive the clamp arm to rotate and lock it when clamping the pile. In this way, by using the chain clutch to drive and lock the clamp arm, the pile body can be automatically locked when pulling the pile, thereby enabling quick and reliable pile pulling operations.

[0044] In the embodiment of the present invention, the pile extractor optimizes the clamp structure and is equipped with a clutch, making the pile extraction operation more convenient and reliable, which will be further described below.

[0045] As Figures 5 - 6 shown, and also referring to Figures 1 - 4 , the clamp J specifically includes a lower jaw plate 34 and a pair of upper jaw arm clamps, namely upper jaw arm clamp one 31 and upper jaw arm clamp two 32, which are arranged side by side. The lower jaw plate 34 is slidably installed on the main housing 19, and the bottom ends of the two upper jaw arm clamps are rotatably installed on the lower jaw plate 34 respectively, and the upper ends of the two upper jaw arm clamps are connected to the driving device Q in a limited sliding manner. Specifically, in this embodiment, arc-shaped sliding grooves are respectively provided at the second ends (i.e., the tops) of the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32. The arc tops of each sliding groove face the center line between the two upper jaw arm clamps, and an arm clamp driving pin 281 is respectively inserted into each sliding groove. The lower jaw plate 34 and the two arm clamp driving pins 281 are respectively connected to the driving device Q, and the driving device Q can move along the center line direction between the two upper jaw arm clamps, specifically, it can slide up and down along the main housing 19. In this way, by providing arc-shaped sliding grooves in the two upper jaw arm clamps and inserting the arm clamp driving pins 281 therein, the rotation and translation of the upper jaw arm clamps are simultaneously realized by driving the translation of the arm clamp driving pins, and finally the removal operation of the workpiece can be realized. Since only one set of driving mechanism needs to be configured, it is beneficial to simplify the structure and save costs.

[0046] As Figure 6 shown, arc-shaped sliding grooves 311 and 321 are respectively provided at the upper ends of the two upper jaw arm clamps. They can be through grooves or counterbores. Their arc tops face the center line between the two upper jaw arm clamps, and the two arm clamp driving pins 281 are symmetrically arranged on both sides of the center line between the two upper jaw arm clamps. Further, the clamping sides of the two upper jaw arm clamps are generally arc-shaped (specifically, it can be a standard arc or a non-standard arc-like shape). The clamping parts of the two upper jaw arm clamps are located in the middle of the clamping sides, and the clamping parts are further provided with arm clamp inserts adapted to the outer shape of the pile body 100 to be clamped. In this way, the arm clamp inserts 312 and 322 can be replaced according to the specifications and shapes of the pile bodies, which is convenient for reliably clamping the pile body 100.

[0047] The driving device Q in this embodiment has a chain 24 wound around a driving sprocket, and the pile pulling stroke is relatively long compared to the oil cylinder. To ensure smooth sliding of the clamp, the clamp J is provided with a sliding plate 35, which has a base portion 351 and a sliding portion 352. The sliding portion 352 is elongated and located at the middle position on one side of the base portion 351. The sliding plate is fixedly installed on the chain 24, where the base portion 351 of the sliding plate 35 is located inside the track groove of the main housing 19, and the sliding portion 352 is located in the track groove; the lower jaw plate 34 is located outside the track groove, and the lower jaw plate 34 and the sliding plate 35 are fixed together by socket head cap screws 33. In this way, the lower jaw plate 34 and the sliding plate 35 are respectively clamped on the inner and outer sides of the track groove, and the lower jaw plate 34 is guided to slide smoothly up and down by the sliding portion 351 of the sliding plate 35 in the track groove. The lower ends of the two upper jaw arm clamps are hinged to the lower jaw plate 34 through arm clamp pins 36, so that the two upper jaw arm clamps can rotate flexibly.

[0048] The driving device Q in this embodiment is provided with a clutch L, which includes a clutch housing 28 and a clutch pawl 27. The clutch pawl 27 is hinged to the clutch housing 28 through a pawl pin 29. Specifically, the first end of the clutch pawl 27 is hinged to the clutch housing 28 through a pawl pin, and the ratchet surface of the second end of the clutch pawl 27 is connectable / separable to the pin shaft of the chain link, thereby realizing the engagement and disengagement with the chain 24. An arm clamp driving pin 281 is provided on the clutch housing 28 of the clutch L, and the arm clamp driving pin 281 is installed through the sliding grooves 311 and 321, so that the two upper jaw arm clamps can slide correspondingly on the clutch housing 28 and be limited. In this way, power is connected through the clutch L, so that the two upper jaw arm clamps can be automatically locked when rotating to the pile clamping position. The structure of the clutch will be further described in detail below in combination with the relevant drawings.

[0049] As Figures 7 - 13 shown, and also refer to Figures 1 - 6, the above-mentioned clutch housing 28 is an assembly. The clutch housing 28 includes components such as a first clutch housing plate 282, a second clutch housing plate 283, a third clutch housing plate 284, a fourth clutch housing plate 285, a chain guide plate 286, and a reinforcing rib 287. The first clutch housing plate 282, the second clutch housing plate 283, and the third clutch housing plate 284 are arranged in parallel. The fourth clutch housing plate 285 and the chain guide plate 286 are respectively arranged perpendicular to the second clutch housing plate 283 and the third clutch housing plate 284. The fourth clutch housing plate 285 and the chain guide plate 286 can be welded to the second clutch housing plate 283 and the third clutch housing plate 284. The first clutch housing plate 282 can be screwed to the second clutch housing plate 283 and the third clutch housing plate 284. A reinforcing rib 287 can also be welded between the second clutch housing plate 283 and the third clutch housing plate 284 to increase strength. The formed special-shaped clutch housing 28 can be installed with components such as an arm clamp drive pin 281, a clutch pawl 27, and a sliding bar 37, which are further described as follows.

[0050] In this embodiment, two arm clamp drive pins 281 are installed on the first clutch housing plate 282. They are horizontally arranged and are installed through the sliding grooves 311 and 321. When the clutch housing 28 slides, the two arm clamp drive pins 281 cause the two upper jaw arm clamps to slide on the clutch housing 28 along the sliding grooves 311 and 321 accordingly. When the clutch housing 28 is limited and stops, the two upper jaw arm clamps tightly clamp the pile body 100 for pile pulling operation.

[0051] In this embodiment, the clutch pawl 27 is clamped between the second clutch housing plate 283 and the third clutch housing plate 284 and is rotatably connected to both of them. The clutch pawl 27 has a ratchet surface adapted to the link pin of the chain 24. By buckling the link pin of the chain 24 through this ratchet surface, the combination of the clutch L and the chain 24 can be achieved, and thus the power of the driving device can be connected.

[0052] In this embodiment, the clutch is further configured with a sliding bar 37. At both ends of one side of the sliding bar 37, limit plates are respectively arranged, so that a sliding bar notch 371 is formed in the middle of the sliding bar 37. The sliding bar 37 is movably installed in the clutch housing 28 through the sliding bar notch 371, and at the same time, it can prevent the sliding bar 37 from disengaging from the clutch housing 28. Here, the upper and lower ends of the sliding bar notch 372 respectively have sliding bar notch inclined surfaces 372 and 373, and the upper end of the clutch pawl 27 has a clutch pawl inclined surface. The upper sliding bar notch inclined surface 372 is adapted to the clutch pawl inclined surface, so that when the two are in contact, the clutch pawl 27 is driven to rotate forward, and the ratchet surface of the clutch pawl 27 is disengaged from the link pin shaft of the chain 24; on one side of the lower end of the clutch pawl 27, there is a clutch ratchet surface, and the other side of the lower end of the clutch pawl 27 is adapted to the lower sliding bar notch inclined surface 373, so that when the two are in contact, the clutch pawl 27 is driven to rotate reversely, and thus the ratchet surface at the lower end of the clutch pawl 27 is buckled to the link pin shaft of the chain 24. Here, the sliding bar 37 is configured with a sliding bar limit block 17, and the sliding bar limit block 17 is fixedly installed at the top of the main housing 19 to limit the upward stroke of the sliding bar 37.

[0053] In this embodiment, the clutch housing 28 can slide up and down along the main housing 19 of the frame. Specifically, the clutch housing plate two 283 is slidably installed in the track groove of the main housing 19, and the housing plate one 282 and the clutch housing plate three 284 are respectively located inside and outside the track groove; at the same time, the chain 24 is passed through the clutch housing 19 and suspended and installed in the main housing 19, so as to ensure the smooth sliding of the clutch housing 28.

[0054] The clamp in this embodiment is configured with a clutch to selectively access the power of the driving device, and the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32 of the clamp can slide on the clutch housing 28 correspondingly and be limited. When the two upper jaw arms rotate to the pile clamping position, they can be automatically locked, thereby realizing fast and reliable pile pulling operation. This clutch structure realizes power access and clamp locking at the same time, simplifies the product structure, has a lower equipment price, and has higher market competitiveness.

[0055] The portable pile pulling product adopting the above clamp and clutch structure is convenient and reliable to operate. The assembly and use process of this pile puller product are described as follows.

[0056] Please refer to Figures 1 - 3 , the assembly process of the pile puller of the present invention is as follows:

[0057] (1) Install the bearing 4 in the driven disc housing 6 and fix it with a circlip for hole 3. Install the driven disc 2 in the bearing 4 and fix it with a circlip for shaft 5. Install and fix the engine 1 on the driven disc housing 6 and fix it with four socket head cap screws 7; Install the bearing 12 in the sprocket housing 14 and fix it with a circlip for hole 11. Install the drive sprocket 10 in the bearing 12 and fix it with a circlip for shaft 13. Install the driven disc housing 6 on the reduction gearbox 9 and fix it with four socket head cap screws 8. Install and fix the reduction gearbox 9 on the sprocket housing 14 and fix it on the sprocket housing 14 with four socket head cap screws 8.

[0058] (2) Install the slide bar limit block 17 on the main housing 19 and fix it with two socket head cap screws 18. Install the puller handle 15 on the main housing 19 and fix it with four socket head cap screws 16.

[0059] (3) Install the blank cover 20 and the engine throttle handle 21 at the corresponding positions on the engine protection frame 22. Install the engine protection frame 22 on the main housing 19 and fix it with two socket head cap screws 23.

[0060] (4) Install the clutch pawl 27 in the clutch housing 28 and fix it with a pawl pin 29 to ensure its flexible rotation. In addition, install the slide bar 37 in the clutch housing 28 so that it can move up and down flexibly.

[0061] (5) Install and fix the slide plate 35 on the chain 24 and fix it with two countersunk head socket screws 33. Install the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32 on the lower jaw plate 34 through two jaw plate pins 36 and fix the jaw plate pins 36 with two circlips for shaft 30.

[0062] (6) Unfasten the chain 24 and pass it through the clutch housing 28, then restore its lock. Install the chain 24 and its components in the main housing 19, and install the clutch housing 28, the lower jaw plate 34, and the slide plate 35 components on the track groove of the main housing 19. And install the chain 24 on the sprocket 10.

[0063] (7) Install the base 39 at the corresponding position on the main housing 19 and fix it with a chain bottom support shaft 38 and a hex flange face lock nut 40. Install and fix two rubber wheels 41 on the 19 through a rubber wheel mounting shaft 42.

[0064] (8) Install and fix the cover one 25 on the main housing 19 through two cross recessed pan head screws 26. Fix the cover two 44 on the main housing 19 through two socket head cap screws 43

[0065] (9)When necessary, further install the pile pulling accessory 45 into the accessory accommodation cavity of the base of the pile puller. The pile pulling accessory can be used to assist in clamping the pile 100 to be pulled out whose height exposed above the ground surface is lower than a preset value. The pile pulling accessory is composed of components such as a column 452, a cross beam 453, and two bottom beams 451a and 451b. During assembly, the cross beam 453 is arranged at the top of the column 451 and fixedly connected to the base of the frame through an accessory fixing piece 454. The two bottom beams 451a and 451 are arranged in a V shape at the bottom end of the column 451 to assist in clamping the pile to be pulled out, and the assembly is relatively easy. Thus, the overall assembly of the pile puller is finally completed.

[0066] In the above assembly process, a large number of screws, snap rings, etc. are used. It can be understood that other parts can also be used to achieve the connection between components. Of course, the connection of the main components of the present invention is not limited to the above-mentioned threaded connection, snap pin connection, etc., and will not be elaborated here.

[0067] See Figures 13 - 20 As shown, the pile puller of the present invention is relatively convenient and reliable to use, and its basic working principle and working process are as described below.

[0068] Preparing for pile pulling: As Figures 14 - 15 shown, make the lower end side of the clutch pawl 27 contact the lower inclined surface of the sliding bar notch at point A, and then make the chain 24 contact the other side of the lower end of the clutch pawl 27 at point B. Thus, the ratchet surface of the pawl pin 27 is buckled with the link pin shaft in the 24 chains. By controlling the engine throttle handle 21, the power is transmitted from the engine 1 to the gearbox 9, and after speed change, it is transmitted to the chain 24 through the drive sprocket 10 to make it rotate (in the direction of R). Since the clutch pawl 27 is buckled on the chain 24, when the chain 24 moves upward, it will inevitably drive the clutch housing 28 to move together. Since the upper jaw arm clamp two 32 is connected to the housing pin 281 on the clutch housing 28 through the sliding groove 321 (the same applies to the upper jaw arm clamp one 31). The upper jaw arm clamp two 32 and the upper jaw arm clamp one 31 are connected together through the lower jaw plate 34 to form an associated body. Thus, when the lower jaw plate 34 moves up and down driven by the sliding plate 35, it will inevitably drive the upper jaw arm clamp two 32 and the upper jaw arm clamp one 31 to move horizontally together. Since the housing pin 281 is in the arc-shaped sliding grooves of the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32, when the clutch housing 28 moves, the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32 will also rotate. Thus, the two will generate a clamping force towards each other through their own sliding grooves, and tightly clamp the pile body 100 to be pulled out through the arm clamp inserts of the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32.

[0069] Pile pulling operation: As Figures 16 - 17As shown, it can be seen that the slider 37 rises with the clutch housing 28 and contacts the slider stop 17 at point D. Since the slider 37 can no longer move, the clutch housing 28 and the clutch pawl 27 continue to move upward. The inclined surface of the clutch pawl 27 contacts the inclined surface of the slider 37 at point E. At this time, the clutch pawl 27 rotates around the pawl pin 29, and the clutch pawl 27 disengages from the chain 24. The clutch housing 28 loses the upward pulling force. Due to its own weight, it begins to descend automatically. At the same time, the clamping force of the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32 disappears, and they descend to the bottom together with the lower jaw plate 34. Return to the position before pile extraction and continue the next pile extraction process. According to whether the pile is pulled out according to its length, control whether to continue pile extraction through the throttle handle. When the pile is pulled out and lifted, such as Figure 6 、 Figure 7 at the position, the power can also be interrupted by controlling the throttle handle. Due to its own weight, the clutch housing 28, the upper jaw arm clamp one 31, the upper jaw arm clamp two 32, and the lower jaw plate 34 descend automatically. At the same time, the clamping force of the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32 disappears and they descend to the bottom. Return to the position before pile extraction and continue the next pile extraction process.

[0070] It should be noted that whether to install the pile extraction auxiliary part 45 can be determined by the height of the pile to be extracted 100 exposed above the ground, which is described in detail as follows.

[0071] Such as Figure 18 shown, when the height H0 of the pile body exposed above the ground is relatively high, that is, the height H2 of the top of the pile body is greater than the set height H1, there is no need to install the pile extraction auxiliary part 45, and the pile to be extracted 100 can be pulled out.

[0072] Such as Figures 19 - 20 shown, if the height H0 of the pile body exposed above the ground is relatively low, the pile extraction auxiliary part 45 can be installed. At this time, the pile extraction auxiliary part 45 is installed in the auxiliary part accommodation cavity of the pile extractor base and can be used to assist in clamping the pile to be extracted 100 with a height lower than the preset value exposed on the ground surface.

[0073] In the above pile extraction process, the arm clamps of the clamp are driven and locked by the chain clutch. The pile body can be automatically locked during pile extraction, so the operation is convenient and reliable. Moreover, the chain drive can increase the pile stroke and also help to reduce the equipment price, which makes the embodiments of the present invention have a good market prospect.

[0074] It should be noted that the above embodiments all use the pile to be extracted 100 as the workpiece to illustrate the structure, principle and working process of the clamp and its locking mechanism. It can be understood that the clamp and its locking mechanism can also be used in other similar occasions. When in use, just clamp the corresponding workpiece to perform the operation, and no further description will be given.

[0075] The above are only the preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be construed as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. For those of ordinary skill in the art, without departing from the spirit and scope of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A clutch, characterized in that, It includes a clutch housing and a clutch pawl. The first end of the clutch pawl is hinged to the clutch housing through a pawl pin. The second end of the clutch pawl has a ratchet tooth surface adapted to the pin shaft of the chain link, and the ratchet tooth surface is connectable / separable to the pin shaft of the chain link to access power. Two arm clamp drive pins are arranged on the clutch housing, and the two arm clamp drive pins are respectively inserted into the sliding grooves of the two upper jaw arm clamps to drive the two upper jaw arm clamps to slide on the clutch housing and be limited; The clutch housing includes a first clutch housing plate, a second clutch housing plate, a third clutch housing plate and a fourth clutch housing plate. Among them, the first clutch housing plate is arranged and fixed in parallel with the second clutch housing plate and the third clutch housing plate, and the fourth clutch housing plate is arranged and fixed perpendicular to the second clutch housing plate and the third clutch housing plate respectively.

2. The clutch according to claim 1, characterized in that, Two arm clamp drive pins are installed on the first clutch housing plate, and the two arm clamp drive pins are arranged horizontally and inserted into the sliding grooves of the two upper jaw arm clamps of the clamp; and / or, the clutch pawl is clamped between the second clutch housing plate and the third clutch housing plate, and the clutch pawl is rotatably connected to the second clutch housing plate and the third clutch housing plate.

3. The clutch according to claim 1, characterized in that, The second clutch housing plate is slidably installed in the track groove of the main housing; and / or, a chain guide plate is vertically fixed between the second clutch housing plate and the third clutch housing plate, and the chain passes through between the second clutch housing plate and the third clutch housing plate and is suspended and installed in the main housing; and / or, welding reinforcing ribs are arranged between the second clutch housing plate and the third clutch housing plate to increase strength.

4. The clutch according to claim 1, wherein, The clutch is configured with a sliding bar. Limiting plates are respectively arranged at both ends of one side of the sliding bar so that notch slopes are respectively formed at the upper and lower ends of the middle part of the sliding bar to form a sliding bar notch. The sliding bar is movably installed in the clutch housing through the sliding bar notch; The upper end of the clutch pawl has a clutch pawl slope, and the upper end notch slope of the sliding bar is adapted to the clutch pawl slope so that when they contact, the clutch pawl can be driven to rotate forward to separate the clutch pawl from the link pin shaft; A clutch pawl slope is arranged on one side of the lower end of the clutch pawl, and the other side of the lower end of the clutch pawl is adapted to the lower end notch slope of the sliding bar, so that when they abut, the clutch pawl is driven to rotate reversely to combine the clutch pawl with the link pin shaft.

5. The clutch according to claim 4, characterized in that, The sliding bar is configured with a sliding bar limiting block, and the sliding bar limiting block is fixedly installed at the top end of the main housing to limit the upward stroke of the sliding bar.

6. The clutch according to claim 1, characterized in that, The top of the chain passes through the clutch housing and is suspended and installed in the main housing of the frame, and the bottom of the chain is supported and tensioned by the chain bottom support shaft on the main housing.

7. The clutch according to any one of claims 1-6, characterized in that, The two arm clamp drive pins are symmetrically arranged on both sides of the center line between the two upper jaw arm clamps, and the arc tops of the sliding grooves of the two upper jaw arm clamps respectively face the center line between the two upper jaw arm clamps.

8. A pile extractor, comprising a frame, characterized in that, A clutch as described in any one of claims 1-7 is installed on the frame. During operation, power is accessed through the clutch to drive the two upper jaw arm clamps of the clamp to clamp the pile to be pulled out for pile pulling.

9. The pile extractor according to claim 8, characterized in that, The pile extractor is configured with pile extraction accessories. The pile extraction accessories include a column, a cross beam and two bottom beams. The cross beam is arranged at the top of the column to be fixedly connected to the base. The two bottom beams are arranged in a V shape at the bottom of the column. By installing the pile extraction accessories in the accessory accommodation cavity of the base of the pile extractor, it is used to assist in clamping the pile to be extracted whose exposed height above the ground is lower than a preset value.

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