A pile extractor

Abstract

An embodiment of the present invention discloses a pile extractor, which has an arm-clamp type clamp assembly installed slidably. The clamp assembly is connected to a chain clutch in a limited-sliding manner. The chain clutch drives the arm clamps of the clamp assembly to rotate so as to clamp or release a pile to be extracted, and at the same time, reliable locking can be ensured during pile clamping. The pile extractor of the present invention can extract small piles conveniently and reliably, and has a high cost performance.

Description

Technical Field

[0001] The present invention relates to engineering machinery, in particular to a pile pulling machine used for small-scale engineering projects such as garden construction. Background Art

[0002] Landscape construction and other projects often involve extensive pile extraction, requiring the removal of square or round piles from the soil. Currently, manual extraction is often used, which is labor-intensive, time-consuming, and labor-intensive. Other methods utilize specialized machinery, such as tightening a wire rope around the pile and then activating a winch to reel the rope in to remove the pile from the soil. However, this method requires a wire rope tightening process, making it inconvenient and unreliable. Furthermore, hydraulic pile pullers are used. A pile clamp grips the pile, and a hydraulic cylinder forcibly presses the clamp upward, lifting it a certain distance. The pile is then removed from the soil in sections. However, these pullers require multiple cylinders, resulting in expensive components and limited reach. Furthermore, these pullers typically utilize large frames, making them bulky and difficult to maneuver. Consequently, existing pile pullers offer unsatisfactory cost-effectiveness for smaller projects like landscape construction. Therefore, a new type of pile puller is needed to meet the needs of users in landscape construction and other applications. Summary of the Invention

[0003] In view of the defects of the prior art, the present invention provides a convenient and reliable pile puller suitable for garden construction and the like.

[0004] To solve the above technical problems, the present invention provides a pile puller, comprising a frame and a chain, a clutch, and a clamp assembly respectively mounted on the frame, wherein the chain is hangably mounted on a main housing of the frame, the clutch is slidably mounted on the main housing and is clutchably connected to the chain, and the clamp assembly is slidably mounted on the main housing and is limitatively slidably connected to the clutch, so as to drive the arm clamp of the clamp assembly to rotate and lock it when clamping a pile.

[0005] The clamp assembly includes a lower jaw plate and a pair of upper jaw arm clamps, the lower jaw plate is slidably mounted on the main shell, the lower end of the upper jaw arm clamp is rotatably mounted on the lower jaw plate, and the upper end of the upper jaw arm clamp can be limitedly slidably connected to the clutch.

[0006] Specifically, the clamp assembly is configured with a sliding plate, which is fixed to the chain, wherein the base portion of the sliding plate is located on the inner side of the track groove of the main shell, and the sliding portion of the sliding plate is located in the track groove; the lower jaw plate is located on the outer side of the track groove, and the lower jaw plate is fixedly connected to the sliding portion of the sliding plate; the lower end of the upper jaw arm clamp is hinged to the lower jaw plate through a jaw plate pin.

[0007] Specifically, an arc-shaped sliding groove is provided at the upper end of the upper jaw arm clamp, and a housing pin is provided on the clutch housing of the clutch. The housing pin is installed through the sliding groove so that the upper jaw arm clamp can slide on the clutch housing for limiting.

[0008] Specifically, the clamping side of the upper jaw arm clamp is arc-shaped, the clamping portion of the upper jaw arm clamp is located in the middle of the clamping side, and an arm clamp insert adapted to the outer shape of the pile to be clamped is provided on the clamping portion.

[0009] Specifically, the clutch includes a clutch ratchet. The clutch ratchet has a ratchet tooth surface adapted to the link pin shaft of the chain. The clutch ratchet is hinged to the clutch housing of the clutch through a ratchet pin.

[0010] Specifically, the clutch is configured with a sliding bar. Limiting plates are provided at both ends of one side of the sliding bar so that a sliding bar notch with notch slopes at the upper and lower ends respectively is formed in the middle of the sliding bar. The sliding bar is movably installed in the clutch housing through the sliding bar notch; the upper end of the clutch ratchet has a clutch ratchet slope, and the upper notch slope of the sliding bar is adapted to the clutch ratchet slope so that when they contact, the clutch ratchet can be driven to rotate forward to separate the clutch ratchet from the link pin shaft; a clutch ratchet slope is provided on one side of the lower end of the clutch ratchet, and the other side of the lower end of the clutch ratchet is adapted to the notch slope of the lower sliding bar so that when they abut, the clutch ratchet is driven to rotate backward to combine the clutch ratchet with the link pin shaft.

[0011] Specifically, the sliding bar is configured with a sliding bar limiting block. 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.

[0012] Specifically, one end of the chain is installed on a driving sprocket. The housing of the driving sprocket is fixedly installed at the top of the main housing. The main shaft of the driving sprocket is connected to an engine fixedly installed on an engine protection frame at the top of the main housing through a speed reducer; the other end of the chain passes through the clutch housing of the clutch and is tensioned on the main housing, wherein the clutch housing is slidably installed on the main housing.

[0013] Specifically, a pile extractor handle is fixedly installed at the top end of the main housing; and / or, a base is fixedly installed at the bottom end of the main housing; and / or, a pair of rollers is provided at the lower part of the main housing for movement.

[0014] Compared with the prior art, the present invention provides a portable pile pulling product with high cost performance. It uses an arm-type clamp assembly to hold the pile to be pulled. The arm clamps of the clamp assembly are driven and locked by a chain clutch, and can automatically lock the pile during pile pulling operations, so the operation is relatively convenient and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a perspective schematic view of an embodiment of the pile puller of the present invention;

[0016] Figure 2 is Figure 1 a partial disassembled schematic view of the pile puller shown Figure 1 ;

[0017] Figure 3 is Figure 1 a partial disassembled schematic view of the pile puller shown Figure 2 ;

[0018] Figure 4 is Figure 1 a schematic view of the pile puller shown when preparing for pile pulling;

[0019] Figure 5 is Figure 4 an enlarged schematic view of part I in

[0020] Figure 6 is Figure 1 a schematic view of the pile puller shown during pile pulling operation;

[0021] Figure 7 is Figure 6 an enlarged schematic view of part II in

[0022] Among them, the relevant reference numerals are as follows:

[0023] 1. Engine; 2. Driven disc; 3. Hole snap ring (Φ42); 4. Bearing (6004-2RS); 5. Shaft snap ring (Φ20); 6. Driven disc housing; 7. Socket head cap screw (M6X30); 8. Socket head cap screw (M8X25); 9. Reduction gearbox; 10. Driving sprocket; 11. Hole snap ring (Φ110); 12. Bearing (6014-2RS); 13. Shaft snap ring (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 protection frame; 23. Socket head cap screw (M10X20); 24. Chain; 25. Cover One; 26. Cross recessed pan head screw (M6X7); 27. Clutch pawl; 28. Clutch housing, 281. Housing pin; 29. Pawl pin; 30. Shaft snap ring (Φ16); 31. Upper jaw arm clamp One, 311. Slide groove, 312. Arm clamp insert; 32. Upper jaw arm clamp Two, 321. Slide groove, 322. Arm clamp insert; 33. Socket head cap 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 Two; 45. Auxiliary extractor; 100. Pile body; P. Clamp assembly. Detailed implementation mode

[0024] The following is a detailed description in combination with the accompanying 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 extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0025] See also Figures 1-7 , which shows a structural schematic diagram of a preferred embodiment of the extractor of the present invention. The extractor is a portable device for pulling out square or round piles in the soil from the ground, mainly composed of a frame, a chain 24, a clutch, a clamp assembly P and a power device, etc. It uses a chain clutch to drive and lock the arm clamps of the clamp assembly, and can automatically lock the pile body 100 during pile extraction, facilitating the quick and safe extraction of the pile body, which is further described as follows. [[ID=!2]]

[0026] As Figures 1-3As shown, the machine frame is in the form of a column, comprising a hollow main housing 19, into which components such as the clutch and chain 24 can be mounted. A slot is formed in one side wall of the main housing 19 to allow passage of components such as the slide plate and connecting pins of the clamp assembly. A pile puller handle 15 is fixedly mounted at the top of the main housing 19 for support during pile pulling operations. A base 39 is fixedly mounted at the bottom of the main housing 19 to stabilize the main housing 19 on the ground during pile pulling operations. Rollers are provided at the bottom of the main housing 19 for movement, specifically a pair of rubber wheels 41, to facilitate movement of the pile puller.

[0027] In this embodiment, a power unit 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. 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 is also equipped with an engine throttle handle 21 for easy control of the engine 1.

[0028] In this embodiment, the chain 24, clutch, and clamp assembly P can be installed in the following structure. The top of the chain 24 is mounted on the drive sprocket 10 and is suspended in the main housing 19 of the frame. The bottom of the chain 24 is supported and tensioned by a support shaft 38 at the bottom of the chain 24 on the main housing 19. The clutch is slidably mounted on the main housing 19 and can be clutched to the chain 24 so as to follow the movement of the chain 24. The clamp assembly P is slidably mounted on the main housing 19 and can be limitedly slidably connected to the clutch to drive the arm of the clamp assembly P to rotate and lock it when clamping the pile. In this way, by using the chain clutch to drive and lock the arm of the clamp assembly, the pile body can be automatically locked when pulling the pile, thereby allowing for quick and reliable pile pulling operations.

[0029] In this embodiment, the clamp assembly P specifically includes a lower jaw plate 34 and a pair of upper jaw arm clamps, namely the first upper jaw arm clamp 31 and the second upper jaw arm clamp 32. The lower jaw plate 34 is slidably installed on the main housing 19. The lower ends of the two upper jaw arm clamps are respectively rotatably installed on the lower jaw plate 34, and the upper ends of the two upper jaw arm clamps are connected to the clutch in a limited-sliding manner. To ensure the smooth sliding of the clamp assembly P, the clamp assembly is provided with a sliding plate 35. The sliding plate 35 has a base portion 351 and a sliding portion 352. The sliding portion 352 is strip-shaped and is located at the middle position on one side of the base portion 351. The sliding plate 35 is fixedly installed on the chain 24. 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 an internal hexagonal countersunk head screw 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 by the sliding portion 351 of the sliding plate 35 in the track groove to ensure the smooth up and down sliding of the lower jaw plate 34. The lower ends of the two upper jaw arm clamps are hinged to the lower jaw plate 34 through a jaw plate pin 36, so as to ensure the flexible rotation of the two upper jaw arm clamps. Further, the clamping sides of the two upper jaw arm clamps are arc-shaped (specifically, it can be a standard arc or a non-standard arc-like shape). The clamping portion of the upper jaw arm clamp is located in the middle of the clamping side, and the clamping portion is further provided with an arm clamp insert 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 pile body specifications and shapes, facilitating the reliable clamping of the pile body 100.

[0030] In this embodiment, arc-shaped sliding grooves 311 and 321 are provided at the upper ends of the upper jaw arm clamps, which can be through grooves or counterbored grooves; correspondingly, a housing pin 281 is provided on the clutch housing 28 of the clutch. The housing pin 281 is installed through the sliding grooves 311 and 321, so that the two upper jaw arm clamps can slide on the clutch housing 28 correspondingly and be limited. In this way, the two upper jaw arm clamps can be automatically locked when rotating to the pile clamping position.

[0031] In this embodiment, the clutch 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. Here, the clutch housing 28 is an assembly, which is slidably installed on the main housing 19. Specifically, the outer housing plate of the clutch housing 28 is located outside the track groove of the main housing 19 for installing the housing pin 281, the inner housing plate is located inside the track groove of the main housing 19, and the middle part is located in the track groove; the chain 24 passes through the clutch housing 19 and is suspended and installed in the main housing 19, so as to facilitate the smooth sliding of the clutch housing 28. It is easy to understand that the clutch pawl 27 has a ratchet surface adapted to the link pin shaft of the chain 24. By buckling the ratchet surface on the link pin shaft of the chain 24, the combination of the clutch and the chain 24 is realized; on the contrary, when the ratchet surface disengages from the link pin shaft of the chain 24, the separation of the clutch and the chain 24 is realized.

[0032] In this embodiment, the clutch is further provided with a sliding bar 37. Limit plates are respectively arranged at both ends of one side of the sliding bar 37, so that a sliding bar notch 371 is formed in the middle of the sliding bar. 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. 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 provided 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.

[0033] See Figures 1-3 As shown, the assembly process of the pile extractor of the present invention is as follows:

[0034] (1) Install the bearing 4 in the driven disk housing 6 and fix it with a hole-type snap ring 3. Install the driven disk 2 in the bearing 4 and fix it with a shaft-type snap ring 5. Install and fix the engine 1 on the driven disk 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 hole-type snap ring 11. Install the drive sprocket 10 in the bearing 12 and fix it with a shaft-type snap ring 13. Install the driven disk 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.

[0035] (2) Install the sliding bar limit block 17 on the main housing 19 and fix it with two socket head cap screws 18. Install the pile extractor handle 15 on the main housing 19 and fix it with four socket head cap screws 16.

[0036] (3) Install the blank cover 20 and the engine throttle handle 21 at the corresponding positions of the engine protection frame 22 respectively. Install the engine protection frame 22 on the main housing 19 and fix it with two socket head cap screws 23.

[0037] (4) Install the clutch pawl 27 in the clutch housing 28 and fix it with the pawl pin 29 to ensure its flexible rotation. In addition, install the sliding bar 37 in the clutch housing 28 to enable its flexible up and down movement.

[0038] (5) Install and fix the sliding plate 35 on the chain 24 and fix it with two socket head cap 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 shaft snap rings 30.

[0039] (6) Unfasten the chain 24 and pass it through the clutch housing 28, and then restore its latch. 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 sliding plate 35 assembly at the corresponding positions of the main housing 19 track groove. And install the chain 24 on the sprocket 10.

[0040] (7) Install the base 39 at the corresponding position of the main housing 19 and fix it with the chain bottom support shaft 38 and the hex flange lock nut 40. Install two rubber wheels 41 on the 19 through the rubber wheel mounting shaft 42.

[0041] (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. Thereafter, according to the pile pulling situation, pile pulling accessories 45, etc. can be further configured, and finally the assembly of the whole pile puller is completed.

[0042] The above assembly process uses a lot of screws, circlips, etc. It can be understood that other parts can also be used to realize 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, pin connection and other methods, and will not be elaborated here.

[0043] See Figures 4-7 As shown, the pile puller of the present invention is more convenient and reliable to use, and its basic working principle and working process are as follows.

[0044] Prepare for pile pulling: As Figure 4 、 Figure 5As shown in the figure, move the pile extractor to the position of the pile to be extracted so that the pile body 100 is located in the jaws of the clamp assembly. At this time, it can be seen that since the sliding bar 37 contacts the base 39 at point C, the lower end side of the clutch pawl 27 contacts the lower inclined surface of the notch of the sliding bar at point A, and further makes 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 engaged with the link pin shaft in the chain 24. 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 (direction: 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 by 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 clutch 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 generate a clamping force towards each other through their own sliding grooves, and tightly clamp the pile body 100 to be extracted through the arm clamp inserts of the upper jaw arm clamp one 31 and the upper jaw arm clamp two 32.

[0045] Pile extraction operation: As Figure 6 , Figure 7 shown, it can be seen that the sliding bar 37 rises with the clutch housing 28 and contacts the sliding bar limit block 17 at point D. Since the sliding bar 37 can no longer move, the clutch housing 28 and the clutch pawl 27 continue to move upward, and the inclined surface of the clutch pawl 27 contacts the inclined surface of the sliding bar 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, and the clutch housing 28 loses the upward pulling force. Due to its own weight, it starts to automatically descend. 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 together with the lower jaw plate 34, it descends to the bottom. Return to the position state before pile extraction and continue the next pile extraction process. According to whether the pile is pulled out by its length, control whether to continue pile extraction through the throttle handle. When the pile is pulled out and lifted, as Figure 6 , Figure 7 shown in the position, it is also possible to control the throttle handle to interrupt the power, so that 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 automatically descend. 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 descends to the bottom. Return to the position state before pile extraction and continue the next pile extraction process.

[0046] Incidentally, if the pile body 100 is less exposed above the ground, the pile pulling accessory 45 can be used in cooperation. At this time, the pile pulling accessory 45 is installed in the accessory accommodating cavity of the pile pulling machine base 39, which can be used to assist in clamping the pile 100 to be pulled out with a height above the ground lower than the preset value, and will not be elaborated here.

[0047] During the above pile pulling process, the arm clamps of the clamp assembly are driven and locked through a chain clutch. The pile body can be automatically locked during pile pulling, so the operation is convenient and reliable. Moreover, the chain drive can increase the pile stroke and also helps to reduce the equipment price, which makes the embodiments of the present invention have a good market prospect.

[0048] The above is only the preferred embodiment of the present invention. It should be noted that the above preferred embodiment should not be regarded as a limitation to the present invention. 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 of this technology, several improvements and refinements can be made without departing from the spirit and scope of the present invention, and these improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A pile extractor, characterized in that, It includes a frame in the form of a vertical column and a chain, a clutch and a clamp assembly respectively installed on the frame. The chain is suspended and installed on the hollow main housing of the frame. The clutch is slidably installed on the main housing and is detachably connected to the chain. The clamp assembly is slidably installed on the main housing and is slidably connected to the clutch in a limited manner, so as to drive the arm clamp of the clamp assembly to rotate and lock during pile clamping. The clutch includes a clutch pawl, and the clutch pawl has a ratchet tooth surface adapted to the link pin shaft of the chain. The clutch pawl is hinged to the clutch housing of the clutch through a pawl pin. The clutch is configured with a sliding bar. Limiting plates are provided at both ends on one side of the sliding bar so that a sliding bar notch with notch slopes at the upper and lower ends is formed in the middle of the sliding bar. 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, so that the clutch pawl is separated from the link pin shaft. A clutch pawl slope is provided on one side at the lower end of the clutch pawl, and the other side at the lower end of the clutch pawl is adapted to the notch slope of the sliding bar at the lower end, so that when they abut, the clutch pawl is driven to rotate reversely, so that the clutch pawl is combined with the link pin shaft.

2. The pile extractor according to claim 1, characterized in that, The clamp assembly includes a lower jaw plate and a pair of upper jaw arm clamps. The lower jaw plate is slidably installed on the main housing. The lower end of the upper jaw arm clamp is rotatably installed on the lower jaw plate, and the upper end of the upper jaw arm clamp is slidably connected to the clutch in a limited manner.

3. The pile extractor according to claim 2, characterized in that, The clamp assembly is configured with a sliding plate. The sliding plate is fixedly installed on the chain. The base part of the sliding plate is located inside the track groove of the main housing, and the sliding part of the sliding plate is located in the track groove. The lower jaw plate is located outside the track groove, and the lower jaw plate is fixedly connected to the sliding part of the sliding plate. The lower end of the upper jaw arm clamp is hinged to the lower jaw plate through a jaw plate pin.

4. The pile extractor according to claim 2, wherein, An arc-shaped sliding groove is provided at the upper end of the upper jaw arm clamp, and a housing pin is provided on the clutch housing of the clutch. The housing pin is installed through the sliding groove so that the upper jaw arm clamp can slide on the clutch housing and be limited.

5. The pile extractor according to claim 2, wherein, The clamping side of the upper jaw arm clamp is arc-shaped, and the clamping part of the upper jaw arm clamp is located in the middle of the clamping side. An arm clamp insert adapted to the shape of the pile body to be clamped is provided on the clamping part.

6. The pile extractor according to claim 5, characterized in that, The sliding bar is configured with a sliding bar limiting block. The sliding bar limiting block is fixedly installed at the top of the main housing so as to limit the upward stroke of the sliding bar.

7. The pile extractor according to claim 1, wherein One end of the chain is installed on a driving sprocket. The housing of the driving sprocket is fixedly installed on the top of the main housing. The main shaft of the driving sprocket is connected to an engine fixedly installed on the engine protection frame at the top of the main housing through a speed reducer box. The other end of the chain passes through the clutch housing of the clutch and is tensioned on the main housing. The clutch housing is slidably installed on the main housing.

8. The pile extractor according to any one of claims 1-7, characterized in that, A pile extractor handle is fixedly installed at the top end of the main housing; and / or, a base is fixedly installed at the bottom end of the main housing; and / or, a pair of rollers is arranged at the lower part of the main housing for movement.

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