A hydraulic pile cutting device with open-close loop and a method for using the same

Abstract

This invention discloses an openable / closeable-loop hydraulic pile cutting device and its usage method. The pile cutting device includes a hydraulic cylinder seat, a hydraulic cylinder and a pile cutting steel rod assembly, a locking mechanism, and an open / closeable-loop power mechanism. The hydraulic cylinder seat includes a first hydraulic cylinder seat, a second hydraulic cylinder seat, and a third hydraulic cylinder seat in an arc-shaped ring. The hydraulic cylinder and pile cutting steel rod assembly includes a hydraulic cylinder and a pile cutting steel rod. The locking mechanism can keep the free ends of the second and third hydraulic cylinder seats in a locked or open state. This pile cutting device can achieve automated open / closed-loop pile cutting, reducing manpower and safety risks. This invention is particularly applicable and effective for construction spaces with low clearance, allowing for the surrounding and cutting of the pile head from the side of the concrete pile without needing to raise the pile cutting device, thus reducing clearance requirements.

Description

Technical Field

[0001] This invention relates to an openable and closed-loop hydraulic pile cutting device and its usage method, belonging to the field of civil engineering construction machinery technology. Background Technology

[0002] Cast-in-place concrete pile foundations are a conventional form of foundation reinforcement structure. To ensure the quality of the pile foundation and its effective connection with other superstructure structures, it is usually required that the piles be over-poured by 0.5 to 1 meter during construction. Before constructing other superstructure structures, the pile head (i.e., the over-poured concrete portion) needs to be chiseled or cut off. Traditional pile head removal methods typically involve manual chiseling with tools such as pneumatic picks, followed by hoisting with a crane. This approach has many drawbacks, including high labor and machinery costs, significant construction safety risks, and low levels of mechanization.

[0003] Currently, some companies have developed simple hydraulic pile-cutting devices. These typically use hoisting machinery to mount the device over the pile head, requiring the device to be first lifted above the pile head and then lowered to the cutting position. However, low-clearance construction sites sometimes cannot meet the lifting height requirements of the robotic arm. Therefore, it is necessary to develop a hydraulic pile-cutting device suitable for low-clearance environments. Summary of the Invention

[0004] This invention provides an openable / closed-loop hydraulic pile cutting device and its usage method. The hydraulic cylinder seat of the openable / closed-loop hydraulic pile cutting device can be adjusted to an open-loop state, so that the hydraulic cylinder seat can fit around the pile head at the pile cutting position on the side of the pile head. It can also be adjusted to a closed-loop state, which is suitable for pile cutting operations. There is no need to lift the openable / closed-loop hydraulic pile cutting device during construction, which is suitable for low-headroom construction environments.

[0005] To solve the above technical problems, the present invention includes the following technical solutions:

[0006] An openable / closeable loop hydraulic pile cutting device includes:

[0007] The hydraulic cylinder seat includes a first hydraulic cylinder seat, a second hydraulic cylinder seat, and a third hydraulic cylinder seat. The two ends of the first hydraulic cylinder seat are respectively hinged to one end of the second hydraulic cylinder seat and one end of the third hydraulic cylinder seat. The other ends of the second hydraulic cylinder seat and the third hydraulic cylinder seat are free ends.

[0008] A plurality of hydraulic cylinders and pile cutting steel rod assemblies, including hydraulic cylinders and pile cutting steel rods; the hydraulic cylinders and pile cutting steel rod assemblies are fixed at intervals on the hydraulic cylinder seats, and the pile cutting steel rods are arranged radially along the hydraulic cylinder seats, and the hydraulic cylinders can drive the pile cutting steel rods to extend and retract.

[0009] The locking mechanism is located at the free ends of the second hydraulic cylinder seat and the third hydraulic cylinder seat, and can realize that the free ends of the second hydraulic cylinder seat and the third hydraulic cylinder seat are in a locked state or an open state; when locked, the first hydraulic cylinder seat, the second hydraulic cylinder seat, the third hydraulic cylinder seat and the locking mechanism form a ring structure.

[0010] Two open-loop power mechanisms are provided. One end of each open-loop power mechanism is connected to both ends of the first hydraulic cylinder seat, and the other end is connected to the second and third hydraulic cylinder seats respectively. The open-loop power mechanisms enable the second and third hydraulic cylinder seats to rotate around the hinge point with the first hydraulic cylinder seat, so that the free ends move closer to or away from the first hydraulic cylinder seat.

[0011] Furthermore, the locking mechanism is an open-loop automatic locking mechanism, which includes a rotating pin seat, a pin holder, a rotating pin, an electromagnet, and a spring.

[0012] The rotating pin seat is fixedly connected to the end of the second hydraulic cylinder seat, and the pin holder is fixedly connected to the end of the third hydraulic cylinder seat.

[0013] The rotating pin seat is provided with two U-shaped rotating pins spaced apart. The rotating pins include a horizontal rotating shaft and a vertical snap-fit ​​pin. The middle part of the rotating shaft is rotatably connected to the rotating pin seat via a rotating shaft. The snap-fit ​​pin is located at one end of the rotating shaft. A set of electromagnets is provided between the two rotating pins. The electromagnets are located at the end of the rotating shaft away from the snap-fit ​​pins. A spring is also provided between the two rotating pins. The spring is located on the rotating shaft at one end of the snap-fit ​​pin.

[0014] The pin holder includes a connecting section and a snap-fit ​​section. The connecting section and the snap-fit ​​section are arranged in a T-shape. One end of the connecting section is perpendicularly connected to the end of the third hydraulic cylinder seat, and the other end of the connecting section is connected to the middle of the inner side of the snap-fit ​​section. The end face of the snap-fit ​​section facing the snap-fit ​​pin is an arc surface, and the center of the arc surface is located on the connecting section. Two snap-fit ​​grooves are provided on the inner side of the snap-fit ​​section. The two snap-fit ​​grooves are located on both sides of the connecting section, and the radius of the arc-shaped groove of the snap-fit ​​groove matches the outer diameter of the snap-fit ​​position of the snap-fit ​​pin.

[0015] Furthermore, the first hydraulic cylinder seat is a semi-circular ring, while the second and third hydraulic cylinder seats are small circular rings. Each of the first, second, and third hydraulic cylinder seats includes an upper flat steel plate, a lower flat steel plate, and a vertical steel plate. The upper and lower flat steel plates are arranged opposite each other, and the top and bottom ends of the vertical steel plate are welded and fixed to the sides of the upper and lower flat steel plates, respectively. The vertical steel plate is provided with mounting holes for mounting the hydraulic cylinder and the pile cutting steel rod assembly.

[0016] Furthermore, a guide steel pipe is provided in the mounting hole, and the guide steel pipe is arranged radially along the hydraulic cylinder seat;

[0017] One end of the hydraulic cylinder extends into the guide steel pipe and is fixedly connected to the guide steel pipe, and the pile cutting steel rod is coaxial with the guide steel pipe.

[0018] Furthermore, the open-loop power mechanism includes a hydraulic telescopic mechanism, and hydraulic cylinder hinge supports and telescopic rod hinge supports respectively disposed at both ends of the hydraulic telescopic mechanism;

[0019] The hydraulic cylinder hinge support and the telescopic rod hinge support of one of the open-loop power mechanisms are respectively fixed on the first hydraulic cylinder seat and the second hydraulic cylinder seat; the hydraulic cylinder hinge support and the telescopic rod hinge support of the other open-loop power mechanism are respectively fixed on the first hydraulic cylinder seat and the third hydraulic cylinder seat.

[0020] Accordingly, the present invention also provides a method for using the aforementioned openable / closed-loop hydraulic pile cutting device, comprising the following steps:

[0021] Step 1: Complete the installation of the device: Install the openable and closed-loop hydraulic pile cutting device on the crane's lifting device, connect the hydraulic oil pipe to the hydraulic cylinder, and ensure that the pile cutting steel rod of the hydraulic cylinder and pile cutting steel rod assembly is at its minimum stroke.

[0022] Step 2: Adjust the openable and closed-loop hydraulic pile cutting device to the open-loop state: put the locking mechanism in the open state, and then use the open and closed-loop power mechanism to make the second hydraulic cylinder seat and the third hydraulic cylinder seat rotate around the hinge point with the first hydraulic cylinder seat, so that the free end moves away.

[0023] Step 3: Moving and positioning the crane: Use the crane to move the openable and closed-loop hydraulic pile cutting device next to the pile head to be cut, so that the ring opening moves towards the pile head and the pile head is in the center position of the hydraulic cylinder seat.

[0024] Step 4: Adjust the openable and closed-loop hydraulic pile cutting device to the closed-loop state: Use the openable and closed-loop power mechanism to rotate the second hydraulic cylinder seat and the third hydraulic cylinder seat around the hinge point with the first hydraulic cylinder seat, so that the free end is close to the first hydraulic cylinder seat, and then put the locking mechanism in the locked state, so that the hydraulic cylinder seat is in the closed-loop state.

[0025] Step 5, Pile Cutting: The circumferentially arranged hydraulic cylinders push the pile cutting steel rods to symmetrically squeeze the pile head concrete, eventually causing the pile head concrete to crack radially and penetrate to form a plane, thus cutting off the pile head.

[0026] Step Six: Lifting off the pile head: Use a crane to lift the device of the present invention, along with the severed pile head, to the designated site;

[0027] Step 7: Open-loop unloading of pile heads: Adjust the openable and closed-loop hydraulic pile cutting device to the open-loop state, and put down the cut pile heads for centralized storage.

[0028] Furthermore, the locking mechanism is an open-loop automatic locking mechanism, which includes a rotating pin seat, a pin holder, a rotating pin, an electromagnet, and a spring. The rotating pin seat is fixedly connected to the end of the second hydraulic cylinder seat, and the pin holder is fixedly connected to the end of the third hydraulic cylinder seat. Two U-shaped rotating pins are spaced apart on the rotating pin seat. Each rotating pin includes a horizontal rotating shaft and a vertical snap-fit ​​pin. The middle part of the rotating shaft is rotatably connected to the rotating pin seat via a rotating shaft, and the snap-fit ​​pin is located at one end of the rotating shaft. A set of electromagnets is provided between the two rotating pins. The end of the rotating shaft away from the snap-fit ​​pin is connected to a spring between the two rotating pins. The spring is located on the rotating shaft at one end of the snap-fit ​​pin. The pin holder includes a connecting section and a snap-fit ​​section. The connecting section and the snap-fit ​​section are arranged in a T-shape. One end of the connecting section is perpendicularly connected to the end of the third hydraulic cylinder seat, and the other end of the connecting section is connected to the middle of the inner side of the snap-fit ​​section. The end face of the snap-fit ​​section facing the snap-fit ​​pin is an arc surface. The center of the arc surface is located on the connecting section. Two snap-fit ​​grooves are provided on the inner side of the snap-fit ​​section. The two snap-fit ​​grooves are located on both sides of the connecting section. The radius of the arc-shaped groove of the snap-fit ​​groove matches the outer diameter of the snap-fit ​​position of the snap-fit ​​pin.

[0029] In step one, connect the electromagnet to the circuit;

[0030] In step two, the locking mechanism is put into the open state by extending the opening and closing loop power mechanism to move the snap pin of the rotating pin out of the snap groove; controlling the direction of the electromagnet current to make the two electromagnets attract each other, causing the spring to open, causing the snap pin to open and leave the end edge of the pin holder; then the opening and closing loop power mechanism is contracted to separate the snap pin of the rotating pin from the end of the pin holder, so that the second hydraulic cylinder seat and the third hydraulic cylinder seat are in the open state.

[0031] In step four, the locking mechanism is locked in the following ways: with the help of the open-loop power mechanism, the locking pin of the rotating pin first touches the arc surface at the end of the pin holder, and the locking pin slides along the arc surface to the edge of the slot of the pin holder; the direction of the electromagnet current is controlled so that the two electromagnets are in a repulsive state, and under the action of the spring force and the electromagnet attraction force, the locking pin clamps the connecting section of the pin holder.

[0032] Compared with existing technologies, this invention, by adopting the above technical solutions, has the following advantages and positive effects: The openable / closeable-loop hydraulic pile cutting device and its usage method provided by this invention can achieve automated open / closed-loop pile cutting, reducing manpower and safety risks. This invention is particularly suitable and effective for construction spaces with low clearance, allowing for the surrounding and cutting of the pile head from the side of the concrete-filled pile without needing to lift the pile cutting device, thus reducing clearance requirements. Compared with traditional pile head processing techniques, this invention reduces labor costs, lowers construction safety risks, and has significant advantages such as high construction efficiency, good quality, and a high level of mechanization. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of an openable and closed-loop hydraulic pile cutting device in one embodiment of the present invention.

[0034] Figure 2 This is a split schematic diagram of the hydraulic cylinder seat in one embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the hydraulic cylinder and pile cutting steel rod assembly in one embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the opening and closing loop automatic locking mechanism in one embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the opening and closing of the automatic locking mechanism according to an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the open-loop and closed-loop power mechanism in one embodiment of the present invention.

[0039] The numbers in the diagram are as follows:

[0040] 10-Hydraulic cylinder seat; 11-First hydraulic cylinder seat; 111-Upper flat steel plate; 112-Vertical steel plate; 113-Mounting hole; 12-Second hydraulic cylinder seat; 13-Third hydraulic cylinder seat;

[0041] 20 - Hydraulic cylinder and pile cutting steel rod assembly; 21 - Hydraulic cylinder; 22 - Pile cutting steel rod;

[0042] 30 - Automatic locking mechanism for opening and closing loops; 31 - Rotary pin seat; 32 - Rotary pin; 321 - Rotating shaft; 322 - Snap-on pin; 33 - Electromagnet; 34 - Spring; 35 - Pin seat; 351 - Connecting section; 352 - Snap-on section; 353 - Arc surface; 354 ​​- Snap-on groove;

[0043] 40 - Open / closed loop power mechanism; 41 - Hydraulic telescopic mechanism; 42 - Hydraulic cylinder hinge support; 43 - Telescopic rod hinge support. Detailed Implementation

[0044] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a more detailed explanation of the openable / closed-loop hydraulic pile cutting device and its usage method provided by the present invention. The advantages and features of the present invention will become clearer from the following description. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0045] Example 1

[0046] like Figure 1 As shown, the openable and closed-loop hydraulic pile cutting device provided in this embodiment includes a hydraulic cylinder seat 10, a hydraulic cylinder and pile cutting steel rod assembly 20, a locking mechanism and an openable and closed-loop power mechanism 40.

[0047] Combination Figure 1 and Figure 2 As shown, the hydraulic cylinder seat 10 includes a first hydraulic cylinder seat 11, a second hydraulic cylinder seat 12, and a third hydraulic cylinder seat 13. The first hydraulic cylinder seat 11 includes an upper flat steel plate 111, a lower flat steel plate (not shown), and a vertical steel plate 112. The upper and lower flat steel plates are arranged opposite each other, and the top and bottom ends of the vertical steel plate are welded and fixed to the sides of the upper and lower flat steel plates, respectively. The vertical steel plate is provided with mounting holes 113 for mounting the hydraulic cylinder and the pile cutting steel rod assembly 20. The first hydraulic cylinder seat 11 is semi-circular, and each of the two open ends is provided with a connecting lug 114. The connecting lug 114 is provided with a pin hole, and a pin 115 is provided in the pin hole. Both the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 include an upper flat steel plate, a lower flat steel plate, and a vertical steel plate. The vertical steel plate also has mounting holes for installing the hydraulic cylinder and the pile-cutting steel rod assembly 20. One end of the second hydraulic cylinder seat 12 has a pin hole and is pinned to one end of the first hydraulic cylinder seat 11. One end of the third hydraulic cylinder seat 13 has a pin hole and is pinned to the other end of the first hydraulic cylinder seat 11. The other ends of the second and third hydraulic cylinder seats 12 and 13 are open ends, and an automatic locking mechanism 30 is provided between the two open ends. The first hydraulic cylinder seat 11 has a semi-circular ring structure, while the second and third hydraulic cylinder seats 12 and 13 have small circular rings. The first, second, and third hydraulic cylinder seats 11, along with the automatic locking mechanism 30, form a complete circular ring structure.

[0048] Combination Figures 1 to 3As shown, the hydraulic cylinder and pile-cutting steel rod assembly 20 is the device for realizing the pile-cutting function in this invention. It includes a hydraulic cylinder 21 and a pile-cutting steel rod 22. The hydraulic cylinder 21 can drive the pile-cutting steel rod 22 to extend and retract. The pile-cutting steel rod 22 includes a tip and can move radially under the drive of the hydraulic cylinder. The circumferentially arranged hydraulic cylinders push the pile-cutting steel rod to symmetrically squeeze the pile concrete, which can cause the pile concrete to crack and penetrate radially to form a plane, thereby achieving the cutting off of the pile head. The hydraulic cylinder and pile-cutting steel rod assembly 20 is arranged at equal angles along the hydraulic cylinder seat 10. Figure 1 The CCP set up 8 hydraulic cylinders and pile cutting steel rod assemblies 20, with the included angle between two adjacent hydraulic cylinders and pile cutting steel rod assemblies 20 being 45°.

[0049] The locking mechanism can employ hook locking, snap locking, or other locking methods, as long as it can lock the free ends of the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 together and allow them to be opened. The structural form and locking method of the locking mechanism are not limited. As a preferred embodiment, the locking mechanism employs an open-closed loop automatic locking mechanism 30, combined with... Figures 1 to 5 As shown, the automatic locking mechanism 30 includes a rotating pin seat 31, a pin holder 35, a rotating pin 32, an electromagnet 33, and a spring 34. The rotating pin seat 31 is fixedly connected to the end of the second hydraulic cylinder seat 12, and the pin holder 35 is fixedly connected to the end of the third hydraulic cylinder seat 13. The rotating pin seat 31 has two spaced-apart U-shaped rotating pins 32. Each rotating pin 32 includes a horizontal rotating shaft 321 and a vertical snap-fit ​​pin 322. The middle part of the rotating shaft 321 is rotatably connected to the rotating pin seat 31 via a rotating shaft, and the snap-fit ​​pin 322 is located at one end of the rotating shaft 321. Two rotating pins 32 are spaced-apart on the rotating pin seat 31, and a set of electromagnets 33 is located between the two rotating pins 32. The electromagnets 33 are located at the end of the rotating shaft away from the snap-fit ​​pins. A spring 34 is also located between the two rotating pins 32, and the spring 34 is located on the rotating shaft at one end of the snap-fit ​​pins.

[0050] The pin holder 35 includes a connecting section 351 and a snap-fit ​​section 352. The connecting section 351 and the snap-fit ​​section 352 are arranged in a T-shape. One end of the connecting section is perpendicularly connected to the end of the third hydraulic cylinder seat 13, and the other end of the connecting section is connected to the middle of the inner side of the snap-fit ​​section. The outer end face of the snap-fit ​​section is an arc surface 353, and the center of the arc surface is located on the connecting section. Two snap-fit ​​grooves 354 are provided on the inner side of the snap-fit ​​section. The two snap-fit ​​grooves are located on both sides of the connecting section. The snap-fit ​​grooves are arc-shaped, and the radius of the arc-shaped grooves matches the outer diameter of the snap-fit ​​pin. When the snap-fit ​​pin 322 abuts against the arc surface 353 of the snap-fit ​​section of the pin holder 35, under the thrust of the opening and closing loop power mechanism 40, the two snap-fit ​​pins 322 slide to both sides along the arc surface 353, and the elastic potential energy of the spring 34 gradually increases. When the snap-fit ​​pins pass the end of the arc surface, under the tension of the spring 34, the two snap-fit ​​pins move toward the connecting section of the pin holder 35, at which point the opening and closing loop automatic locking mechanism 30 is in a locked state. Under the tension of the opening and closing loop power mechanism 40, or when the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 are subjected to circumferential tension after the pile cutting steel rod is tightened against the pile head, the snap-fit ​​pins move into the snap-fit ​​groove 354 of the pin holder 35, further enhancing the locking effect of the opening and closing loop automatic locking mechanism 30. When the snap-fit ​​pin 322 is located in the snap-fit ​​groove 354, the automatic locking mechanism 30 is in the locked state. The tension of the spring 34 prevents the two snap-fit ​​pins from sliding out of the snap-fit ​​groove. At this time, the two electromagnets 33 can also generate a repulsive force, causing the two snap-fit ​​pins to tend to clamp the pin holder 35, further preventing the snap-fit ​​pins from sliding out of the snap-fit ​​groove. By changing the direction of the current, the two electromagnets 33 can generate an attractive force. When the torque generated by the attraction of the electromagnet is greater than the torque of the spring force of the spring 34, the rotating shaft will rotate, causing the two snap-fit ​​pins to disengage from the snap-fit ​​groove. After the rotating pin 322 separates from the pin holder 35, the automatic locking mechanism 30 is in the open state.

[0051] The open / closed-loop power mechanism 40 primarily enables the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 to rotate around the hinge point with the first hydraulic cylinder seat 11. This can be achieved by using a motor to drive gear rotation, or by using an electric push rod. In one specific embodiment, combined with... Figures 1 to 6As shown, the open-loop power mechanism 40 includes two hydraulic telescopic mechanisms 41, and cylinder hinge supports 42 and telescopic rod hinge supports 43 respectively disposed at both ends of the hydraulic telescopic mechanisms 41. The cylinder hinge support 42 at one end of one hydraulic telescopic mechanism 41 is welded to the upper surface steel plate of the first hydraulic cylinder seat 11, and the telescopic rod hinge support 43 at the other end is welded to the upper surface steel plate of the second hydraulic cylinder seat 12. Similarly, the cylinder hinge support 42 at one end of the other hydraulic telescopic mechanism 41 is welded to the upper surface steel plate of the first hydraulic cylinder seat 11, and the telescopic rod hinge support 43 at the other end is welded to the upper surface steel plate of the third hydraulic cylinder seat 13. The extension and retraction of the hydraulic telescopic mechanism 41 can help the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 to rotate in a plane around the pin. When the two hydraulic telescopic mechanisms 41 retract simultaneously, the ends of the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 can be brought closer together, thereby closing the hydraulic cylinder seat 10. When the two hydraulic telescopic mechanisms 41 extend simultaneously, the ends of the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 can be moved away from each other, thereby opening the hydraulic cylinder seat 10.

[0052] In this invention, the principle of the openable / closed-loop hydraulic pile cutting device to achieve a closed-loop mechanical automation function is as follows: The hydraulic telescopic mechanism 41 of the openable / closed-loop power mechanism 40 extends. Under the assistance of the openable / closed-loop power mechanism 40, the free ends of the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 approach each other, causing the locking pin of the rotating pin 32 to first touch the arc surface at the end of the pin seat 35. The locking pin slides along the arc surface to the edge of the slot in the pin seat 35. The direction of the current in the electromagnet 33 is controlled so that the two electromagnets 33 are in a repulsive state. Under the elastic force of the spring 34 and the attraction force of the electromagnet 33, the locking pin clamps the connecting section of the pin seat 35. Furthermore, the hydraulic telescopic mechanism 41 of the openable / closed-loop power mechanism 40 can also retract. Under the pulling force of the openable / closed-loop power mechanism 40, the ends of the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 move away simultaneously, causing the locking pin to enter the locking groove.

[0053] In this invention, the principle of the openable / closeable-loop hydraulic pile cutting device to achieve the mechanically automated open-loop function is as follows: the hydraulic telescopic mechanism 41 of the open / closeable-loop power mechanism 40 extends, which here is a short-distance extension operation, and the extension distance is denoted as... L 1, L 1= D + d , D The depth of the buckle slot. d For example, a preset value d=1~10cm, is to make the snap-fit ​​pin of the rotating pin 32 move out of the snap-fit ​​groove; control the current direction of the electromagnet 33 so that the two electromagnets 33 are in a state of mutual attraction, so that the spring 34 opens, so that the snap-fit ​​pin opens and leaves the end edge of the pin holder 35; then the hydraulic telescopic mechanism 41 of the opening and closing loop power mechanism 40 retracts, so that the snap-fit ​​pin of the rotating pin 32 separates from the end of the pin holder 35, so that the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 of the hydraulic cylinder seat 10 are in an open state.

[0054] Example 2

[0055] This embodiment provides a method for using the described openable / closeable-loop hydraulic pile cutting device, which is described below in conjunction with... Figures 1 to 6 To be further described, the method of use includes the following steps:

[0056] Step 1: Complete the installation of the device: Install the openable / closed-loop hydraulic pile cutting device on the crane's lifting device, connect the hydraulic oil pipe to the hydraulic cylinder, and ensure that the hydraulic cylinder and the pile cutting steel rod 22 of the pile cutting steel rod assembly 20 are in their minimum stroke. For example, the openable / closed-loop hydraulic pile cutting device can be hoisted onto the crane's lifting device using a wire rope or chain.

[0057] When the locking mechanism is an open-loop automatic locking mechanism 30, connect the electromagnet 33 to the circuit. When the open-loop power mechanism 40 adopts a hydraulic telescopic mechanism 41, connect the hydraulic telescopic mechanism 41 to the hydraulic oil pipe.

[0058] Step 2: Adjust the openable and closed-loop hydraulic pile cutting device to the open-loop state: put the locking mechanism in the open state, and then use the open-loop and closed-loop power mechanism 40 to make the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 rotate around the hinge point with the first hydraulic cylinder seat 11, so that the free end moves away.

[0059] When the locking mechanism is the open-loop automatic locking mechanism 30, the locking mechanism is in the open state specifically by the extension operation of the hydraulic telescopic mechanism 41 of the open-loop power mechanism 40, which moves the snap-fit ​​pin of the rotating pin 32 out of the snap-fit ​​groove; controlling the current direction of the electromagnet 33 so that the two electromagnets 33 are in an attractive state, causing the spring 34 to open, causing the snap-fit ​​pin to open and leave the end edge of the pin holder 35; then the hydraulic telescopic mechanism 41 of the open-loop power mechanism 40 is contracted, causing the snap-fit ​​pin of the rotating pin 32 to separate from the end of the pin holder 35, so that the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 of the hydraulic cylinder seat 10 are in the open state.

[0060] Step 3: Moving and positioning the crane: Use the crane to move the openable and closed-loop hydraulic pile cutting device to the side of the pile head to be cut, so that the ring opening moves towards the pile head and the pile head is in the center of the hydraulic cylinder seat 10.

[0061] Step 4: Adjust the openable and closed-loop hydraulic pile cutting device to the closed-loop state: Use the openable and closed-loop power mechanism 40 to rotate the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 around the hinge point with the first hydraulic cylinder seat 11, so that the free ends are close together, and then put the locking mechanism in the locked state, so that the hydraulic cylinder seat 10 is in the closed-loop state.

[0062] When the locking mechanism is the open-loop automatic locking mechanism 30, the locking mechanism is in the locked state specifically as follows: Under the assistance of the open-loop power mechanism 40, the snap-fit ​​pin of the rotating pin 32 first touches the arc surface at the end of the pin holder 35, and the snap-fit ​​pin slides along the arc surface to the edge of the slot of the pin holder 35; the current direction of the electromagnet 33 is controlled so that the two electromagnets 33 are in a repulsive state, and under the elastic force of the spring 34 and the attraction force of the electromagnet 33, the snap-fit ​​pin clamps the connecting section of the pin holder 35. Furthermore, the hydraulic telescopic mechanism 41 of the open-loop power mechanism 40 can be retracted. Under the pulling force of the open-loop power mechanism 40, the ends of the second hydraulic cylinder seat 12 and the third hydraulic cylinder seat 13 move away simultaneously, causing the snap-fit ​​pin to enter the snap-fit ​​slot.

[0063] Step 5, Pile Cutting: The circumferentially arranged hydraulic cylinders push the pile cutting steel rod assembly 20 to symmetrically squeeze the pile head, eventually causing the pile head concrete to crack radially and penetrate to form a plane, thus achieving the cutting off of the pile head.

[0064] Step Six: Pile Head Removal: Use a crane to lift the openable and closed-loop hydraulic pile cutting device, along with the cut pile head, to the designated site.

[0065] Step 7: Open-loop unloading of pile heads: Adjust the openable and closed-loop hydraulic pile cutting device to the open-loop state, put down the cut pile heads and store them in a centralized manner.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A hydraulic pile-cutting device with openable and closed-loop operation, characterized in that, include: The hydraulic cylinder seat includes a first hydraulic cylinder seat, a second hydraulic cylinder seat, and a third hydraulic cylinder seat. The two ends of the first hydraulic cylinder seat are respectively hinged to one end of the second hydraulic cylinder seat and one end of the third hydraulic cylinder seat. The other ends of the second hydraulic cylinder seat and the third hydraulic cylinder seat are free ends. A plurality of hydraulic cylinders and pile cutting steel rod assemblies, including hydraulic cylinders and pile cutting steel rods; the hydraulic cylinders and pile cutting steel rod assemblies are fixed at intervals on the hydraulic cylinder seats, and the pile cutting steel rods are arranged radially along the hydraulic cylinder seats, and the hydraulic cylinders can drive the pile cutting steel rods to extend and retract. The locking mechanism is located at the free ends of the second hydraulic cylinder seat and the third hydraulic cylinder seat, and can realize that the free ends of the second hydraulic cylinder seat and the third hydraulic cylinder seat are in a locked state or an open state; when locked, the first hydraulic cylinder seat, the second hydraulic cylinder seat, the third hydraulic cylinder seat and the locking mechanism form a ring structure. Two open-loop power mechanisms are provided. One end of each open-loop power mechanism is connected to both ends of the first hydraulic cylinder seat, and the other end is connected to the second hydraulic cylinder seat and the third hydraulic cylinder seat, respectively. The open-loop power mechanisms can make the second hydraulic cylinder seat and the third hydraulic cylinder seat rotate around the hinge point with the first hydraulic cylinder seat, so that the free end moves closer to or away from the first hydraulic cylinder seat. The locking mechanism is an open-loop automatic locking mechanism, which includes a rotating pin seat, a pin holder, a rotating pin, an electromagnet, and a spring. The rotating pin seat is fixedly connected to the end of the second hydraulic cylinder seat, and the pin holder is fixedly connected to the end of the third hydraulic cylinder seat. The rotating pin seat is provided with two U-shaped rotating pins spaced apart. The rotating pins include a horizontal rotating shaft and a vertical snap-fit ​​pin. The middle part of the rotating shaft is rotatably connected to the rotating pin seat via a rotating shaft. The snap-fit ​​pin is located at one end of the rotating shaft. A set of electromagnets is provided between the two rotating pins. The electromagnets are located at the end of the rotating shaft away from the snap-fit ​​pins. A spring is also provided between the two rotating pins. The spring is located on the rotating shaft at one end of the snap-fit ​​pin. The pin holder includes a connecting section and a snap-fit ​​section. The connecting section and the snap-fit ​​section are arranged in a T-shape. One end of the connecting section is perpendicularly connected to the end of the third hydraulic cylinder seat, and the other end of the connecting section is connected to the middle of the inner side of the snap-fit ​​section. The end face of the snap-fit ​​section facing the snap-fit ​​pin is an arc surface, and the center of the arc surface is located on the connecting section. Two snap-fit ​​grooves are provided on the inner side of the snap-fit ​​section. The two snap-fit ​​grooves are located on both sides of the connecting section, and the radius of the arc-shaped groove of the snap-fit ​​groove matches the outer diameter of the snap-fit ​​position of the snap-fit ​​pin.

2. The openable / closeable-loop hydraulic pile cutting device as described in claim 1, characterized in that, The first hydraulic cylinder seat is a semi-circular ring, while the second and third hydraulic cylinder seats are small circular rings. Each of the first, second, and third hydraulic cylinder seats includes an upper flat steel plate, a lower flat steel plate, and a vertical steel plate. The upper and lower flat steel plates are arranged opposite each other, and the top and bottom ends of the vertical steel plate are welded and fixed to the sides of the upper and lower flat steel plates, respectively. The vertical steel plate is provided with mounting holes for mounting the hydraulic cylinder and the pile cutting steel rod assembly.

3. The openable / closed-loop hydraulic pile cutting device as described in claim 2, characterized in that, A guide steel pipe is provided in the mounting hole, and the guide steel pipe is arranged radially along the hydraulic cylinder seat; One end of the hydraulic cylinder extends into the guide steel pipe and is fixedly connected to the guide steel pipe, and the pile cutting steel rod is coaxial with the guide steel pipe.

4. The openable / closeable-loop hydraulic pile cutting device as described in claim 1, characterized in that, The open-loop power mechanism includes a hydraulic telescopic mechanism, and hydraulic cylinder hinge supports and telescopic rod hinge supports respectively located at both ends of the hydraulic telescopic mechanism; The hydraulic cylinder hinge support and the telescopic rod hinge support of one of the open-loop power mechanisms are respectively fixed on the first hydraulic cylinder seat and the second hydraulic cylinder seat; the hydraulic cylinder hinge support and the telescopic rod hinge support of the other open-loop power mechanism are respectively fixed on the first hydraulic cylinder seat and the third hydraulic cylinder seat.

5. A method of using the openable / closed-loop hydraulic pile cutting device as described in claim 1, characterized in that, Includes the following steps: Step 1: Complete the installation of the device: Install the openable and closed-loop hydraulic pile cutting device on the crane's lifting device, connect the hydraulic oil pipe to the hydraulic cylinder, and ensure that the pile cutting steel rod of the hydraulic cylinder and pile cutting steel rod assembly is at its minimum stroke. Step 2: Adjust the openable and closed-loop hydraulic pile cutting device to the open-loop state: put the locking mechanism in the open state, and then use the open and closed-loop power mechanism to make the second hydraulic cylinder seat and the third hydraulic cylinder seat rotate around the hinge point with the first hydraulic cylinder seat, so that the free end moves away. Step 3: Moving and positioning the crane: Use the crane to move the openable and closed-loop hydraulic pile cutting device next to the pile head to be cut, so that the ring opening moves towards the pile head and the pile head is in the center position of the hydraulic cylinder seat. Step 4: Adjust the openable and closed-loop hydraulic pile cutting device to the closed-loop state: Use the openable and closed-loop power mechanism to rotate the second hydraulic cylinder seat and the third hydraulic cylinder seat around the hinge point with the first hydraulic cylinder seat, so that the free end is close to the first hydraulic cylinder seat, and then put the locking mechanism in the locked state, so that the hydraulic cylinder seat is in the closed-loop state. Step 5, Pile Cutting: The circumferentially arranged hydraulic cylinders push the pile cutting steel rods to symmetrically squeeze the pile head concrete, eventually causing the pile head concrete to crack radially and penetrate to form a plane, thus cutting off the pile head. Step 6: Pile head removal: Use a crane to lift the openable and closed-loop hydraulic pile cutting device along with the cut pile head to the designated site. Step 7: Open-loop unloading of pile heads: Adjust the openable and closed-loop hydraulic pile cutting device to the open-loop state, and put down the cut pile heads for centralized storage.

6. The method of using the openable / closed-loop hydraulic pile cutting device as described in claim 5, characterized in that, In step one, connect the electromagnet to the circuit; In step two, putting the locking mechanism in the open state specifically involves the following steps: the opening and closing loop power mechanism extends to move the locking pin of the rotating pin out of the locking groove; the direction of the electromagnet current is controlled to make the two electromagnets attract each other, causing the spring to open and the locking pin to open and move away from the end edge of the pin holder; then the opening and closing loop power mechanism retracts to separate the locking pin of the rotating pin from the end of the pin holder, putting the second and third hydraulic cylinder seats of the hydraulic cylinder seats in the open state. In step four, the locking mechanism is locked in the following ways: with the assistance of the open-loop power mechanism, the locking pin of the rotating pin first touches the arc surface at the end of the pin holder, and the locking pin slides along the arc surface to the groove edge of the pin holder; the direction of the electromagnet current is controlled so that the two electromagnets are in a repulsive state, and under the elastic force of the spring and the action of the electromagnet, the locking pin clamps the connecting section of the pin holder.

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