Bidirectional high-speed oil cylinder and log splitter

Abstract

A bidirectional high-speed oil cylinder and a log splitter. The bidirectional high-speed oil cylinder comprises a hydraulic oil cylinder body (41); a large piston (42), which is slidably arranged in the hydraulic oil cylinder body and divides an inner cavity of the hydraulic oil cylinder body into a rod cavity (45) and a rodless cavity (46); and a piston rod (43), which is telescopically mounted on the hydraulic oil cylinder body, an end of the piston rod extending into the rod cavity and being connected to the large piston. A hydraulic control check valve (47) on the large piston automatically opens and closes according to different working conditions of the bidirectional high-speed oil cylinder when the piston rod performs a reciprocating operation, such that hydraulic oil in the rod cavity and in the rodless cavity automatically compensates for each other; and the bidirectional high-speed oil cylinder makes the piston rod rapidly reciprocate during light-load or no-load operation, and generates a huge thrust equivalent to that of a traditional oil cylinder during a heavy-load operation, thereby improving the working efficiency of a log splitter, and reducing the energy consumption of a hydraulic system.

Description

A two-way high-speed hydraulic cylinder and a wood splitter Technical Field

[0001] This technical solution relates to the field of wood splitting devices, specifically a bidirectional high-speed hydraulic cylinder and a wood splitter. Background Technology

[0002] Existing log splitters, as important auxiliary equipment in the wood processing industry, are mainly divided into two major series: vertical and horizontal. Their core function is to use hydraulic principles to split hard wood materials such as tree stumps, large branches, and round logs to meet specific size requirements or to transform them into materials for other uses.

[0003] When splitting wood, the hydraulic cylinders of a wood splitter need to provide tremendous thrust. Simultaneously, during non-splitting phases or after the wood has been split, the cylinders should be able to quickly extend or retract to improve efficiency. Therefore, some larger wood splitters employ a dual-pump design to achieve this function. The dual-pump system consists of a large low-pressure pump and a small high-pressure pump connected in parallel. When the wood splitter does not require heavy splitting, both pumps supply oil simultaneously, operating at high flow and low pressure, allowing the cylinders to achieve faster speeds with less thrust. When greater thrust is needed, the hydraulic oil in the large pump flows back to the oil tank, ensuring that the engine's power is sufficient to meet the high-pressure requirements of the small pump.

[0004] However, regarding the aforementioned technologies, the inventors believe that existing wood splitters still have the following shortcomings:

[0005] 1. When using a tandem pump under non-uniform load conditions, the hydraulic oil pumped into the cylinders is not effectively utilized because the larger pump is constantly running under high pressure, resulting in wasted effort. Furthermore, the combined operation of the large and small pumps requires a large hydraulic oil tank for the entire hydraulic system, and the system experiences significant heat generation issues.

[0006] 2. Existing wood splitters connect the guide rail on the main beam directly to the front baffle, and have holes at the front end of the main beam for removing wood scraps. This not only affects the structural strength of the main beam, but also makes the cleaning work extremely difficult because the wood scraps need to be discharged through these holes. At the same time, the effect of discharging the wood scraps through the holes is not ideal, and it is impossible to effectively remove all the residual wood scraps.

[0007] 3. The main beam, front baffle, and tail plate of the wood splitter are all made of heavy steel plates. This not only makes the entire wood splitter appear bulky, but also the bending strength of the front baffle is not sufficiently guaranteed, resulting in insufficient strength. At the same time, the use of thicker steel plates also increases the manufacturing cost of the wood splitter, which has an adverse effect on production efficiency and cost control. Summary of the Invention

[0008] The purpose of this technical solution is to provide a bidirectional fast hydraulic cylinder and a log splitter. By setting a hydraulically controlled check valve on the large piston of the bidirectional fast hydraulic cylinder, the hydraulic oil in the rod chamber can enter the rodless chamber under light load or no load conditions. Thus, only a small pumping flow is needed to achieve rapid extension of the piston rod. This solves the problem of low efficiency and high energy loss in existing hydraulic systems due to huge working flow and large energy loss.

[0009] Furthermore, this technical solution utilizes a bidirectional high-speed hydraulic cylinder, requiring only a small amount of power and hydraulic system flow to operate. This results in a system that only needs a small oil tank and a matching integrated power unit. Secondly, this technical solution improves and locally strengthens the structure of the main beam and the wood-splitting axe of the wood splitter to ensure they can better cooperate with the efficient operation of the bidirectional high-speed hydraulic cylinder, thereby improving the overall wood-splitting performance and efficiency.

[0010] The purpose of this technical solution is achieved as follows:

[0011] A bidirectional rapid-acting hydraulic cylinder includes: a hydraulic cylinder body; a large piston slidably disposed within the hydraulic cylinder body, dividing the inner cavity of the hydraulic cylinder body into a rod chamber and a rodless chamber; a piston rod retractably mounted on the hydraulic cylinder body, with its end extending into the rod chamber and connected to the large piston; and a hydraulically controlled check valve mounted on the large piston for connecting the rod chamber and the rodless chamber. When hydraulic oil enters the rodless chamber from the oil pump and drives the large piston to move, the oil pressure in the rod chamber increases, causing the hydraulically controlled check valve to open, thereby allowing the hydraulic oil in the rod chamber to enter the rodless chamber through the hydraulically controlled check valve and push the large piston to move.

[0012] Preferably, it further includes: an elastic element, one end of which is movably connected to a piston rod extending from the hydraulic cylinder body, and the other end of which is movably connected to the hydraulic cylinder body. The elastic element causes the piston rod to have a tendency to retract into the hydraulic cylinder body. A fourth through hole is provided on the rod chamber to conduct through its inner and outer sides, and a fifth through hole is provided on the rodless chamber to conduct through its inner and outer sides. When the elastic element causes the piston rod to move, the large piston moves, causing the hydraulic oil in the rodless chamber to flow out from the fifth through hole, and the oil pump transports the hydraulic oil to the rod chamber. Alternatively, it further includes: a quick reset unit, which is used to control the hydraulic oil in the rodless chamber to return to the rod chamber through the hydraulic control check valve. The quick reset unit includes a hollow perforated inner pull rod, a small piston, a push rod seat, and a push rod assembly. The piston rod is hollow. One end of the hollow perforated inner pull rod is connected to the cylinder rear cover of the hydraulic cylinder body, and the other end passes through the large piston and extends into the inner cavity of the piston rod. The hollow perforated inner pull rod is slidably connected to the large piston. A mounting cavity is provided on the large piston, and a push rod seat and a push rod assembly are provided in the mounting cavity. An oil passage connecting the rod chamber and the hydraulic check valve is formed in the middle of the push rod seat and the push rod assembly. The part of the push rod seat adjacent to the hydraulic check valve is a guide part two. An auxiliary piston chamber is formed between the periphery of the guide part two and the side wall of the mounting cavity. One end of the push rod assembly is located in the auxiliary piston chamber and forms a piston part. The other end of the push rod assembly faces the hydraulic check valve. A small piston is connected to one end of the hollow perforated inner rod, and the periphery of the small piston is slidably connected to the inner wall of the piston rod. The small piston divides the inner cavity of the piston rod into a reset area and a clearance area. The reset area is connected to the oil passage inside the hollow perforated inner rod. A control oil hole is provided on the piston rod. The control oil hole is connected to the reset area, and the control oil hole enables the oil passage between the reset area and the auxiliary piston chamber to be connected. When the hydraulic oil in the reset area enters the auxiliary piston chamber, the push rod assembly drives the hydraulic check valve to open.

[0013] Preferably, the hydraulic cylinder body is provided with a control unit, the control unit including a control valve; the control valve is connected to the front cover plate of the hydraulic cylinder body, the control valve and the rear cover of the cylinder are connected by two connecting oil pipes, and the control valve is used to control the connecting oil pipes to supply oil to the rodless chamber or the reset area respectively.

[0014] Preferably, the hydraulic check valve includes a first steel ball and a first spring; a first through hole is provided on the large piston, and the rodless chamber communicates with the rod chamber through the first through hole; one end of the first spring is connected to the large piston, and the other end is connected to the first steel ball, so as to make the first steel ball block the first through hole.

[0015] Preferably, a hydraulic control switch valve is integrated on the control unit or the front cover of the cylinder. When the hydraulic oil pressure in the rodless chamber reaches a set value P, the hydraulic control switch valve connects the rod chamber to the return oil line. A second through hole is provided on the front cover of the cylinder, through which the rod chamber and the return oil line are connected. An oil circuit board is connected to the control valve and is mounted on the front cover of the cylinder. A third through hole is provided on the oil circuit board, through which the return oil line and the second through hole are connected. The hydraulic control switch valve includes a thrust control push rod valve core, a second steel ball, and a second spring. One end of the second spring is connected to the oil circuit board, and the other end is connected to the second steel ball, for the second steel ball to block the third through hole. The thrust control push rod valve core is slidably connected inside the oil circuit board, and the push rod of the thrust control push rod valve core can pass through the third through hole and abut against the second steel ball.

[0016] Preferably, the hydraulic cylinder body includes a cylinder body, a cylinder front cover mounted on the cylinder body, a sealing cover, and a control valve connected to the cylinder front cover plate; the cylinder body includes a cylinder steel pipe and a cylinder rear cover, the cylinder steel pipe, the cylinder rear cover, and two connecting oil pipes are welded together as one piece, the cylinder rear cover is provided with an ejection oil hole communicating with the rodless chamber and the control valve, and a retraction oil hole communicating with the hollow internal tie rod and the control valve, and the two connecting oil pipes are inserted into the control valve.

[0017] A wood splitter includes: a frame, a baffle, a wood splitting axe, a bidirectional high-speed hydraulic cylinder, and a power unit. The bidirectional high-speed hydraulic cylinder is mounted on the frame, the baffle is mounted on the frame, and the wood splitting axe is mounted on the drive end of the bidirectional high-speed hydraulic cylinder. A working space for placing wood is formed between the frame, the baffle, and the wood splitting axe. The power unit is mounted on the frame to provide power to the bidirectional high-speed hydraulic cylinder. The frame has a main beam with an H-shaped base. The tail end of the main beam is bent upwards, and a tail plate is welded to the tail end. Reinforcing plates are provided on both sides of the tail plate. The end of the bidirectional high-speed hydraulic cylinder is mounted on the reinforcing plates and the tail plate. Reinforcing ribs are provided on both sides of the main beam. The upper ends of the reinforcing ribs are bent and placed above the main beam to form a guide rail for the wood splitting axe to slide along. Guide plates are inclinedly arranged on both sides of the main beam. The guide plates are located between the guide rail and the baffle and are used for the wood to fall from the top of the main beam.

[0018] Preferably, the power unit includes an engine, an adapter plate, an oil pump, and an oil tank; the oil pump is disposed inside the oil tank and integrated with the engine via the adapter plate; the engine is connected to the frame; one side of the adapter plate is connected to the engine, and the other side is connected to the oil pump; the oil tank is disposed on the outer periphery of the oil pump, and the oil tank is connected to the adapter plate; the oil pump is connected to the control unit in sequence via the adapter plate and the oil supply pipeline, and the control unit delivers hydraulic oil to the reset area or the rodless chamber respectively.

[0019] Preferably, the side of the baffle away from the wood-breaking axe has several reinforcing ribs, and the several reinforcing ribs are connected end to end and welded to form a reinforcing ring. The inner walls of the reinforcing ring are welded together by the reinforcing ribs. The side of the baffle near the wood-breaking axe is provided with several fixing protrusions, which are used to fix the end of the wood.

[0020] Preferably, the wood-chopping axe is S-shaped like an eagle's head, comprising a force-bearing body, a guide part, and a blade part; the guide part is located below the force-bearing body and the blade part and is horizontally arranged; the force-bearing body is vertically arranged above the guide part; the blade part is arranged on the side of the force-bearing body away from the bidirectional rapid hydraulic cylinder, and the front end of the blade part is provided with a cutting edge; a fixing part is provided on the upper side of the cutting edge, which is used to fix the wood; the lower half of the cutting edge protrudes to provide a cutting edge, which is used to split the wood; the fixing part is further away from the bidirectional rapid hydraulic cylinder than the cutting edge; an arc-shaped concave first blade part is formed between the fixing part and the cutting edge; and an inwardly inclined second blade part is formed on the lower side of the cutting edge.

[0021] Preferably, the hydraulic power unit of the log splitter is a highly integrated power unit, with the oil pump located in a small oil tank and integrated with the engine or motor.

[0022] The key and beneficial technical effects of this technical solution compared to existing technologies are:

[0023] 1. The hydraulically controlled check valve designed in this technical solution allows the hydraulic oil in the rod chamber of the bidirectional fast-acting cylinder to enter the rodless chamber under light load or no-load conditions, enabling the piston rod to be ejected quickly with a smaller pump flow rate. This not only reduces the energy consumption of the hydraulic system, achieving environmental protection and energy saving, but also reduces the total demand for hydraulic oil and the costs of hydraulic oil transmission and control, thereby reducing the manufacturing and operating costs of the product. In addition, the highly integrated design of the bidirectional fast-acting cylinder has a simple structure and is easy to operate, further reducing manufacturing costs.

[0024] 2. The control valve of this technical solution is designed with a hydraulic control switch valve. The hydraulic control switch valve can automatically open or close according to the load change of the bidirectional fast cylinder, realize the automatic switching between light load fast and heavy load slow working conditions, solve the contradiction between thrust, speed and power under non-uniform load operation, realize heavy load operation through simple structure, and avoid the high energy consumption and high cost problems caused by complex hydraulic systems such as double pumps.

[0025] 3. This technical solution creates a working space for placing wood between the frame, baffle, and wood splitting axe; the power unit provides power to the bidirectional fast hydraulic cylinder; the hydraulic control check valve enables the piston rod to operate quickly in both directions with a small hydraulic oil pump inflow, reducing idle waiting time during the operation of the wood splitter, improving work efficiency, reducing the power of the wood splitter but increasing work efficiency, and reducing manufacturing costs, operating costs and maintenance costs.

[0026] 4. The hydraulic cylinder body of this technical solution includes a cylinder body, a front cover and a rear cover of the cylinder body, two connecting oil pipes, a threaded cap, and a control valve. The cylinder steel pipe of the cylinder body is welded to the rear cover of the cylinder body and the two connecting oil pipes as one piece. The connecting oil pipes are directly inserted into the control valve for installation, which simplifies the installation of oil pipe joints and reflects the overall integration characteristics. At the same time, the control valve and the front cover of the cylinder are connected by a plate, which is convenient for installation and easy to operate, avoiding the cumbersome installation problems between oil pipe joints and control valves.

[0027] 5. The power unit of the wood splitter in this technical solution is highly integrated. The oil pump is located in a small oil tank and integrated with the engine or motor, which can save the number of oil pipes and avoid oil leakage problems at the oil pipe connection. At the same time, because the hydraulic system requires a small hydraulic oil flow, the oil tank volume can be reduced. Furthermore, through the design of the adapter plate, the connecting oil pipes of the existing wood splitter are eliminated, reducing the possibility of oil leakage failure. Since the power of the wood splitter is not directly related to the thrust and speed, the power unit of this technical solution can be adapted to wood splitters of various sizes and specifications, thereby saving manufacturing and management costs.

[0028] 6. The main beam of the frame in this technical solution is made of H-shaped steel. The tail end of the main beam is bent upward and inlaid with a tail plate. The end of the bidirectional fast oil cylinder is installed on the reinforcing plate and the tail plate. Compared with the existing wood splitter which is entirely welded from steel plates, this solution improves the connection strength, reduces the manufacturing cost, and maintains the overall coordination and aesthetics of the machine by integrally cutting and shaping the profile.

[0029] 7. The main beam of this technical solution is equipped with a guide rail for the wood splitting axe to slide. The guide rail is formed by bending the upper end of the reinforcing rib plate and placing it above the main beam. Compared with the existing wood splitter which uses two long steel plates stacked together, this reduces manufacturing costs.

[0030] 8. A guide plate is provided between the guide rail and the baffle in this technical solution. The guide plate can not only position the wood together with the guide rail, but also guide the falling of the wood chips.

[0031] 9. The wood-splitting axe of this technical solution is S-shaped like an eagle's head. The shape of the eagle's head can better split the wood. The eagle's beak forms a fixing part and is used to hold the wood in place. The first cutting part corresponding to the concave part of the eagle's beak pulls the wood down and splits it. In particular, during the process of splitting the wood, the cutting edge corresponding to the protruding part under the eagle's beak is located at the lower edge of the wood, which is more conducive to splitting the wood.

[0032] 10. The front end baffle of the main beam in this technical solution has several reinforcing ribs, and the reinforcing ribs are connected end to end to form a reinforcing ring. The inner walls of the reinforcing rings are then connected by reinforcing ribs, which improves the deformation resistance of the baffle. Attached Figure Description

[0033] Figure 1 is a schematic diagram of the structure of this technical solution.

[0034] Figure 2 is a side view of this technical solution.

[0035] Figure 3 is a schematic diagram of the bidirectional fast hydraulic cylinder of this technical solution.

[0036] Figure 4 is a cross-sectional view of the bidirectional fast hydraulic cylinder of this technical solution.

[0037] Figure 5 is an enlarged view of point B in Figure 4.

[0038] Figure 6 is a cross-sectional view of section AA in Figure 4.

[0039] Figure 7 is a schematic diagram of the power unit structure of this technical solution.

[0040] Figure 8 is a partial cross-sectional view of the power unit of this technical solution.

[0041] Figure 9 is one of the structural schematic diagrams of the main beam in this technical solution.

[0042] Figure 10 is the second structural schematic diagram of the main beam in this technical solution.

[0043] Figure 11 is a side view of the main beam of this technical solution.

[0044] Figure 12 is a schematic diagram of the baffle structure of this technical solution.

[0045] Figure 13 is a schematic diagram of the wood-breaking axe structure of this technical solution.

[0046] Figure 14 is a side view of the wood-breaking axe of this technical solution.

[0047] Reference numerals: 1. Frame; 11. Main beam; 12. Tail plate; 13. Reinforcing plate; 14. Reinforcing rib; 15. Working space; 16. Guide plate; 17. Guide rail; 2. Baffle; 21. Reinforcing rib; 22. Reinforcing ring; 23. Fixing protrusion; 3. Wood-breaking axe; 30. Fixing part; 31. Load-bearing body; 32. Guide part one; 33. Blade part; 34. Cutting edge; 35. Blade edge; 36. 37. First cutting edge; 4. Second cutting edge; 5. Double-acting rapid hydraulic cylinder; 41. Hydraulic cylinder body; 411. Cylinder body; 412. Cylinder front cover; 413. Cylinder rear cover; 414. Cylinder steel pipe; 415. Installing double lugs; 42. Large piston; 421. Mounting cavity; 422. Auxiliary piston cavity; 43. Piston rod; 441. Push rod seat; 4411. First through hole; 4412. Control oil hole; 441 3. Guide section II; 442. Push rod assembly; 4421. Sliding seat; 4422. Push rod body; 4423. Third spring; 4424. Limiting platform; 443. Oil passage; 45. Rod chamber; 46. Rodless chamber; 47. Hydraulic check valve; 471. First steel ball; 472. First spring; 5. Power unit; 51. Engine; 52. Adapter plate; 53. Oil pump; 54. Oil tank; 6. Control unit; 60. Oil circuit board; 601. Third through hole; 61. Control valve; 63. Control handle; 64. Connecting oil pipe; 7. Hydraulic switch valve; 711. Second through hole; 72. Thrust control push rod valve core; 73. Second steel ball; 74. Second spring; 8. Quick reset unit; 81. Hollow perforated inner pull rod; 82. Small piston; 821. Reset area; 822. Clearance area; 9. Wooden pallet. Detailed Implementation

[0048] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings, see Figures 1-14.

[0049] A bidirectional rapid hydraulic cylinder includes: a hydraulic cylinder body 41; a large piston 42, which is slidably disposed within the hydraulic cylinder body 41 and divides the inner cavity of the hydraulic cylinder body 41 into a rod chamber 45 and a rodless chamber 46; a piston rod 43, which is telescopically mounted on the hydraulic cylinder body 41, with one end of the piston rod 43 extending into the rod chamber 45 and connected to the large piston 42, and the other end extending out of the hydraulic cylinder body 41 to form a drive end; and a hydraulically controlled check valve 47, which is mounted on the large piston 42 and used to connect the rod chamber 45 and the rodless chamber 46.

[0050] When the oil pump 53 pumps hydraulic oil into the rodless chamber 46 and drives the large piston 42 to move, the rod chamber 45 decreases in volume as the large piston 42 moves, causing the pressure in the rod chamber 45 to increase. This causes the hydraulic control check valve 47 to open, allowing the hydraulic oil in the rod chamber 45 to enter the rodless chamber 46 through the hydraulic control check valve 47 and push the large piston 42 to move together with the hydraulic oil pumped in by the oil pump.

[0051] When the bidirectional rapid-acting hydraulic cylinder 4 is under light load or no-load conditions, the oil pump 53 pumps hydraulic oil into the rodless chamber 46 through the oil inlet pipe. At this time, the rod chamber 45 is in a fully closed state, and the large piston 42 slides along the hydraulic cylinder body 41, causing the volume of the rod chamber 45 to decrease. This results in the hydraulic oil pressure in the rod chamber 45 being greater than the hydraulic oil pressure in the rodless chamber 46. The hydraulically controlled check valve 47 automatically opens, and the hydraulic oil in the rod chamber 45 directly enters the rodless chamber 46 through the hydraulically controlled check valve 47. At this time, because the hydraulic oil in the rodless chamber 46, which has increased in volume, comes from both the external oil pump 53 and the rod chamber 45, and approximately seven times more hydraulic oil comes from the rod chamber 45, compared to a conventional cylinder, the oil pump 53 only needs to pump in less than one-seventh of the flow rate to achieve a faster speed than a conventional cylinder; thus realizing piston... The piston rod 43 is driven by a small flow rate for rapid extension. When the piston rod 43 extends, the hydraulic oil in the rod chamber 45 can enter the rodless chamber 46 under light load or no-load conditions through the hydraulically controlled check valve 47. When the piston rod 43 retracts, the hydraulic oil in the rodless chamber 46 can enter the rod chamber 45 through the hydraulically controlled check valve 47. This achieves a rapid bidirectional function of piston rod 43 extension and retraction with a small pumping flow rate, which drastically reduces the energy consumption of the hydraulic system, achieves environmental protection and energy saving, reduces environmental pollution, and directly reduces the total demand for hydraulic oil due to the reduced pumping oil volume. This significantly reduces the power of the drive and also reduces the cost of hydraulic oil transmission and control, thereby greatly reducing the manufacturing and operating costs of the product.

[0052] The bidirectional rapid hydraulic cylinder also includes: a rapid reset unit 8, which controls the oil in the rodless chamber 46 to return to the rod chamber 45 through the hydraulic check valve 47; to realize the rapid reset of the piston rod 43. The rapid reset unit 8 includes a hollow perforated inner pull rod 81, a small piston 82, a push rod seat 441, and a push rod assembly 442.

[0053] The piston rod 43 is hollow;

[0054] One end of the hollow, perforated inner tie rod 81 is connected and fixed to the cylinder rear cover 413 of the hydraulic cylinder body 41, and the other end passes through the large piston 42 and extends into the inner cavity of the piston rod 43. The hollow, perforated inner tie rod 81 is slidably connected to the large piston 42. The end of the piston rod 43 is internally threaded with a sealing plug. The sealing plug is sleeved on the outside of the hollow, perforated inner tie rod 81 and is sealed. The rear end of the sealing plug has an abutment platform. The abutment platform movably abuts against the rear ends of the large piston 42 and the piston rod 43. The sealing plug, together with the small piston 82 and the hollow, perforated inner tie rod 81, forms a reset area 821.

[0055] A mounting cavity 421 is provided on the large piston 42, and a push rod seat 441 and a push rod assembly 442 are provided in the mounting cavity 421. An oil passage 443 is formed in the middle of the push rod seat 441 and the push rod assembly 442, which connects the rod cavity 45 and the hydraulic check valve 47. The part of the push rod seat 441 adjacent to the hydraulic check valve 47 is a guide part 4413. An auxiliary piston cavity 422 is formed between the periphery of the guide part 4413 and the side wall of the mounting cavity 421. One end of the push rod assembly 442 is provided in the auxiliary piston cavity 422 and forms a piston part. The other end of the push rod assembly 442 faces the hydraulic check valve 47.

[0056] The small piston 82 is connected to one end of the hollow perforated inner tie rod 81, and the periphery of the small piston 82 is slidably connected to the inner wall of the piston rod 43. The small piston 82 divides the inner cavity of the piston rod 43 into a reset area 821 and a relief area 822. The reset area 821 is connected to the oil passage inside the hollow perforated inner tie rod 81. A control oil hole 4412 is provided on the piston rod 43. The control oil hole 4412 is connected to the reset area 821. The control oil hole 4412 enables the oil passage between the reset area 821 and the auxiliary piston chamber 422 to be connected. When the hydraulic oil in the reset area 821 enters the auxiliary piston chamber 422, the push rod assembly 442 drives the hydraulic control check valve 47 to open.

[0057] Hydraulic oil flows into the hollow, perforated inner rod 81 through the oil pump 53 and into the reset zone 821. The hydraulic oil in the reset zone 821 enters the auxiliary piston chamber 422 through the control oil hole 4412 and pushes the push rod assembly 442 to move, thereby controlling the hydraulic check valve 47 to open.

[0058] The oil pump 53 pumps hydraulic oil into the reset zone 821 via the hollow perforated inner tie rod 81. Since the reset zone 821 is connected to the auxiliary piston chamber 422 through the control oil hole 4412, the hydraulic oil in the reset zone 821 acts on the push rod assembly 442 and pushes open the first steel ball 471, controlling the hydraulic check valve 47 to open. At this time, the rodless chamber 46 and the rod chamber 45 are connected. The hydraulic oil in the rodless chamber 46 returns directly to the rod chamber 45 through the hydraulic check valve 47, causing the large piston 42 to retract quickly and complete the piston rod 43 reset action. The designed quick reset unit 8, through the hollow piston rod 43, the hollow perforated inner tie rod 81 and the small piston 82, forms a small reset cylinder structure, which can realize the quick reset action of the piston rod 43.

[0059] The hydraulic cylinder body 41 is equipped with a control unit 6. The control unit 6 is connected to the power unit 5 through an oil supply line. The control unit 6 includes a control valve 61, a bounce reset mechanism, and a control handle 63. The control valve 61 is plate-connected to the cylinder front cover 412. The plate-connection means that the control valve 61 and the cylinder front cover 412 are stacked and fastened together in a planar form to form a compact and orderly whole, which is convenient for installation, maintenance and system integration. Specifically, each control unit (i.e., the control valve 61 and the cylinder front cover 412) is stacked on a planar plane, that is, stacked layer by layer and connected together to achieve integration into one unit. The two close planes of the control valve 61 and the cylinder front cover 412 are fitted together, and there are through holes in the middle of the two planes, which are aligned and connected to each other.

[0060] The control valve 61 connects the front cover 412 and the rear cover 413 of the cylinder through two connecting oil pipes 64. The flow direction of the hydraulic oil in the steel pipe can be controlled by operating the control handle 63. During the reset process of the bidirectional rapid cylinder 4, the control valve handle automatically returns to the neutral position after the piston rod 43 is retracted into place.

[0061] In this design, the control valve 61 is connected to the front cover 412 of the hydraulic cylinder body 41 in a plate manner. The control valve 61 and the rear cover 413 of the cylinder are connected by two connecting oil pipes 64. The control valve 61 is connected to the front cover 412 of the cylinder, and the control valve 61 is used to control the connecting oil pipes 64 to supply oil to the rodless chamber 46 or the reset area 821 respectively.

[0062] The hydraulic check valve 47 includes a first steel ball 471 and a first spring 472;

[0063] The push rod seat 441 and the push rod assembly 442 are hollow, and the large piston 42 has a first through hole 4411. The rodless cavity 46 communicates with the rod cavity 45 through the first through hole 4411 and along the hollow of the push rod assembly 442 and the push rod seat 441.

[0064] One end of the first spring 472 is connected to the large piston 42 via a retaining ring, and the other end is connected to the first steel ball 471, which is used to make the first steel ball 471 block the first through hole 4411;

[0065] The end of the push rod assembly 442 is slidably sleeved on the push rod seat 441, and the push rod seat 441 is used to restrict the push rod assembly 442 from disengaging from the large piston 42. The push rod assembly 442 is slidably connected in the mounting cavity 421 of the large piston 42, and the push rod body 4422 of the push rod assembly 442 can pass through the first through hole 4411 and abut against the first steel ball 471.

[0066] The push rod assembly 442 can contact the hydraulic oil in the reset zone 821. When there is oil pressure, the hydraulic oil in the reset zone 821 pushes the push rod assembly 442 to abut and push open the first steel ball 471 through the control oil hole 4412, so that the first steel ball 471 no longer blocks the first through hole 4411, thereby realizing the connection between the rod cavity 45 and the rodless cavity 46.

[0067] During light-load operation, the oil pump 53 continuously pumps hydraulic oil into the rodless chamber 46. As the hydraulic oil pressure in the rodless chamber 46 increases, it exerts a thrust on the large piston 42. Because the rod chamber 45 is sealed at this time, the hydraulic oil pressure in the rod chamber 45 rises rapidly. The hydraulic oil in the rod chamber 45 directly pushes open the first steel ball 471, and the first steel ball 471 no longer blocks the first through hole 4411. The rod chamber 45 and the rodless chamber 46 are connected through the first through hole 4411. The hydraulic oil in the rod chamber 45 directly enters the rodless chamber 46 through the first through hole 4411. Since most of the hydraulic oil... The oil supplied to the rodless chamber 46 from the rod chamber 45 is hydraulic oil. The oil pump 53 only needs a small flow rate to achieve a faster ejection speed. When the piston rod 43 resets, the hydraulic oil in the reset zone 821 pushes the push rod assembly 442 to move. The push rod assembly 442 pushes the first steel ball 471 to move, and the first through hole 4411 opens. The hydraulic oil in the rodless chamber 46 enters the rod chamber 45 through the first through hole 4411 to complete the rapid reset. The designed hydraulic control check valve 47 can achieve high-speed ejection and rapid reset under light load conditions with a small flow rate drive.

[0068] The push rod assembly 442 includes: a sliding seat 4421, a push rod body 4422, and a third spring 4423;

[0069] The sliding seat 4421 is slidably sleeved on the push rod seat 441, and the rear half of the sliding seat 4421 is slidably disposed in the auxiliary piston chamber 422 to form a piston part. The push rod body 4422 is slidably disposed in the front half of the sliding seat 4421, and one end of the push rod body 4422 is movably abutted against the limiting platform 4424 in the sliding seat 4421, and the other end passes through the first through hole 4411 and abuts against the first steel ball 471. One end of the third spring 4423 is movably abutted against the push rod body 4422, and the other end is movably abutted against the edge of the first through hole 4411, so as to make the push rod body 4422 have a tendency to move away from the first steel ball 471, thereby realizing the reset of the push rod assembly 442.

[0070] The control unit 6 or the cylinder front cover 412 is integrated with a hydraulic control valve 7. When the hydraulic oil pressure in the rodless chamber 46 reaches the set value P, the hydraulic control valve 7 connects the rod chamber 45 with the return oil line.

[0071] Under heavy-load operation, due to the large force on piston rod 43, oil pump 53 continuously pumps hydraulic oil into rodless chamber 46, causing the hydraulic oil pressure in rodless chamber 46 to continuously increase. This, in turn, gradually increases the thrust on large piston 42 until the hydraulic oil pressure in rodless chamber 46 reaches P. At this point, the hydraulic control valve 7 on control unit 6 or cylinder front cover 412 opens under the hydraulic oil pressure in rodless chamber 46, connecting rod chamber 45 to the return oil line. The previously closed rod chamber 45 is suddenly connected to the return oil line, and the hydraulic oil pressure in rod chamber 45 can be considered to drop instantaneously to 0. At this time, the oil pressure in rodless chamber 46 is greater than the oil pressure in rod chamber 45, and the hydraulic control check valve 47 on large piston 42... The system automatically closes immediately, and all the high-pressure hydraulic oil in the rodless chamber 46 acts on the large piston 42, generating the same huge thrust as a conventional hydraulic cylinder to complete heavy-duty operations. The designed hydraulic control switch valve 7 can control the flow direction of the hydraulic oil in the rod chamber 45. When the system oil pressure reaches the set pressure, the hydraulic control switch valve 7 automatically opens, connecting the hydraulic oil in the rod chamber 45 to the oil tank 54. It can automatically switch between light-load and heavy-load operating conditions by cooperating with the hydraulic control check valve 47, fundamentally solving the contradiction between thrust, speed and drive power under non-uniform load operating conditions. It achieves heavy-duty operation through a simple structure, reducing the high manufacturing costs caused by using complex hydraulic systems such as double pumps.

[0072] A second through hole 711 is provided on the front cover 412 of the cylinder, and the rod chamber 45 and the oil return line are connected through the second through hole 711.

[0073] The control valve 61 is connected to an oil circuit board 60, which is installed on the front cover 412 of the oil cylinder. The oil circuit board 60 is provided with a third through hole 601, and the return oil pipeline and the second through hole 711 are connected through the third through hole 601.

[0074] The cylinder rear cover 413 is connected to the oil circuit board 60 through two connecting oil pipes 64, and the connecting oil pipes 64 connected to the oil circuit board 60 are connected to the rodless chamber 46 or the reset area 821 through the control valve 61.

[0075] The hydraulic control switch valve 7 includes: a thrust control rod valve core 72, a second steel ball 73, and a second spring 74; one end of the second spring 74 is encapsulated in the oil circuit board 60 by a screw, and the other end is connected to the second steel ball 73, which is used to block the third through hole 601 by the second steel ball 73.

[0076] The thrust control push rod valve core 72 is slidably connected to the oil circuit plate 60, and the push rod of the thrust control push rod valve core 72 can pass through the third through hole 601 and abut against the second steel ball 73.

[0077] The hydraulic control switch valve 7 can be integrated into the control unit 6 or the cylinder front cover 412. That is, the oil circuit board 60 can be integrated with the control valve 61 and then installed on the cylinder front cover 412, or the oil circuit board 60 can be directly integrated into the cylinder front cover 412, and then the control valve 61 can be connected to the cylinder front cover 412 in a plate manner.

[0078] Under heavy-load operation, the piston rod 43 remains stationary initially, and the oil pump 53 continuously pumps hydraulic oil into the rodless chamber 46. The oil pressure in the rodless chamber 46 continuously rises to the set value P. The rodless chamber 46 is connected to the force application chamber of the thrust control push rod valve 72 through an oil circuit (that is, the oil circuit board 60 and the rodless chamber 46 are connected by a connecting oil pipe 64, which can be used to supply oil to the rodless chamber 46, and can also transport the hydraulic oil in the rodless chamber 46 to the oil circuit board 60 to apply force to the thrust control push rod valve 72, or the rodless chamber 46 can be connected by a new connecting oil pipe 64 to realize the hydraulic oil in the rodless chamber 46 applying force to the thrust control push rod valve). When the core 72 applies force, under the hydraulic pressure of the rodless chamber 46, the core 72 of the thrust control valve applies force to the second steel ball 73, causing the second steel ball 73 to overcome the elastic force of the second spring 74. The third through hole 601 opens and connects with the second through hole 711. At this time, the rod chamber 45 and the return oil line are connected, and the hydraulic oil pressure in the rod chamber 45 drops rapidly. The hydraulic control check valve 47 on the large piston 42 immediately closes automatically. All the high-pressure oil in the rodless chamber 46 acts on the large piston 42, generating a huge thrust to complete the heavy-load operation. The designed hydraulic control switch valve 7 can work with the hydraulic control check valve 47 to realize the random automatic switching between heavy-load operation and light-load operation conditions.

[0079] The hydraulic cylinder body 41 includes a cylinder body 411, a cylinder front cover 412 mounted on the cylinder body 411, a sealing cover, and a control valve 61 plate-connected to the cylinder front cover 412. The sealing cover is used to connect and fix the cylinder body 411 to the cylinder front cover 412. The cylinder body 411 includes a cylinder steel pipe 414 and a cylinder rear cover 413. The cylinder steel pipe 414, the cylinder rear cover 413, and two connecting oil pipes 64 are welded together. A double lug 415 is welded onto the cylinder rear cover 413, and the oil... The cylinder rear cover 413 is provided with an oil outlet connecting the rodless chamber 46 and the control valve 61, and a retraction oil outlet connecting the hollow perforated inner rod 81 and the control valve 61. A connecting oil pipe 64 is connected to the oil outlet and the retraction oil outlet respectively. By operating the control valve 61, hydraulic oil is sequentially passed through the oil circuit board 60 and the connecting oil pipe 64 into the rodless chamber 46 or the hollow perforated inner rod 81. During installation, the two connecting oil pipes 64 are directly inserted into the control valve 61.

[0080] A wood splitter includes: a frame 1, a baffle 2, a wood splitting axe 3, a two-way rapid hydraulic cylinder 4, and a power unit 5; an oil pump 53 is installed in an oil tank 54 and integrated with an engine 51 via an adapter plate 52.

[0081] A traction unit is installed on the frame 1; the traction unit includes a connecting rod, a traction head and two traction chains. One end of the connecting rod is horizontally bolted to the frame 1, and the other end is bolted to the traction head. One end of the traction chain is welded to the connecting rod, and the connection between the traction chain and the connecting rod is located close to the traction head.

[0082] A bidirectional rapid hydraulic cylinder 4 is mounted on a frame 1, a baffle 2 is vertically welded to a frame 1, and a wood-breaking axe 3 is mounted on the piston rod 43 of the bidirectional rapid hydraulic cylinder 4. A working space 15 for placing wood is formed between the frame 1, the baffle 2, and the wood-breaking axe 3. To facilitate temporary storage of wood, two wooden pallets 9 are hinged to the frame 1, and the two wooden pallets 9 are located on opposite sides of the working space 15. A power unit 5 is mounted on the frame 1 to provide power to the bidirectional rapid hydraulic cylinder 4.

[0083] The power unit 5 includes an engine 51, an adapter plate 52, an oil pump 53, and an oil tank 54; the oil pump 53 is located inside the oil tank 54 and is integrated with the engine 51 through the adapter plate 52.

[0084] The base of the engine 51 is bolted to the frame 1. One side of the adapter plate 52 in the thickness direction is bolted to the engine 51, and the other side is bolted to the oil pump 53. The output shaft of the engine 51 passes through the adapter plate 52 and is keyed to the input shaft of the oil pump 53. The oil tank 54 is covered on the outer periphery of the oil pump 53 and is bolted to the adapter plate 52. The oil pump 53 is connected to the control unit 6 in sequence through the oil passage and oil supply pipeline inside the adapter plate 52. The control unit 6 then supplies hydraulic oil to the reset area 821 or the rodless chamber 46.

[0085] The oil supply pipeline includes an inlet oil pipeline and a return oil pipeline. The return oil pipeline is used for the hydraulic oil to flow back to the oil tank 54. The inlet oil pipeline is used for the hydraulic oil to flow into the oil circuit board 60, and then the oil circuit board 60 distributes the hydraulic oil to the rodless chamber 46 or the reset area 821.

[0086] The oil pump 53 has an oil inlet end that allows hydraulic oil from the oil tank 54 to enter the oil pump 53 through an oil pipe. The oil outlet end of the oil pump 53 is connected to the adapter plate 52 through an oil circuit. The adapter plate 52 and the oil tank 54 are connected through an oil circuit, so that the hydraulic oil can return from the adapter plate 52 to the oil tank 54.

[0087] The frame 1 has a main beam 11, the base of which is an H-shaped profile. The main beam 11 is formed by cutting a single profile, which reduces the processing steps compared to the traditional main beam 11 formed by welding three plates. Furthermore, the integral forming of the main beam 11 improves its load-bearing capacity. The main beam 11 has an H-shaped cross-section. The tail end of the main beam 11 is bent upwards, and a tail plate 12 is embedded and welded to the tail end. Reinforcing plates 13 are provided on both sides of the tail plate 12. The end of the rapid hydraulic cylinder 4 is mounted on the reinforcing plate 13 and the tail plate 12. The mounting double lugs 415 of the bidirectional rapid hydraulic cylinder 4 are hinged to the tail plate 12 and the reinforcing plate 13. The tail end of the main beam 11 is first provided with a mounting groove, and the tail plate 12 is vertically embedded in the mounting groove and then fixed by welding. The upper end of the tail plate 12 protrudes from the upper end of the main beam 11. The two sides of the tail plate 12 are welded to the side wall of the mounting groove, and the front end of the tail plate 12 abuts against the bottom of the mounting groove and is welded together.

[0088] When the bidirectional fast hydraulic cylinder 4 is splitting wood, the tail plate 12 is subjected to excessive force due to the reaction force moving backward. The tail plate 12 only needs to be made of metal materials such as steel, which improves the bearing capacity and reduces the production cost.

[0089] Both sides of the main beam 11 are provided with reinforcing ribs 14. The upper end of the reinforcing ribs 14 is bent and placed above the main beam 11. A gap is left between the bent part of the upper end of the reinforcing ribs 14 and the upper end of the main beam 11 for the guide part 32 to slide (that is, the bottom of the guide part 32 is slidably set at the upper end of the main beam 11, the reinforcing ribs 14 first wrap around the side wall of the guide part 32, and then the upper end of the reinforcing ribs 14 is bent and placed at the upper end of the guide part 32), thereby forming a guide rail 17 for the wood splitting axe 3 to slide, which is used to limit the wood located in the working space 15, ensure the stability of the wood when splitting or moving, and ensure the removal of wood chips.

[0090] Guide plates 16 are inclinedly arranged on both sides of the main beam 11, that is, the upper end of the guide plate 16 is bent away from the upper end of the main beam 11. The guide plate 16 is located between the guide rail 17 and the baffle 2. While the guide plate 16 and the guide rail 17 position the wood together, the guide plate 16 can strengthen the strength of both the main beam 11 and the baffle 2. At the same time, the guide plate 16 can easily remove residual wood chips.

[0091] The side of the baffle 2 away from the wood-breaking axe 3 has several reinforcing ribs 21, and the several reinforcing ribs 21 are connected end to end and welded together at the connection to form a reinforcing ring 22. The inner walls of the reinforcing ring 22 are connected again by welding the reinforcing ribs 21, which improves the load-bearing capacity of the baffle 2.

[0092] The baffle 2 has several fixing protrusions 23 on the side near the wood-breaking axe 3, which are used to fix the end of the wood.

[0093] The wood-breaking axe 3 is S-shaped like an eagle's head. It includes a force-bearing body 31, a guide part 32, and a blade part 33. The guide part 32 is located below the force-bearing body 31 and the blade part 33 and is set horizontally. The force-bearing body 31 is set vertically above the guide part 32. The blade part 33 is set on the side of the force-bearing body 31 away from the bidirectional fast oil cylinder 4. The front end of the blade part 33 is provided with a cutting edge 34.

[0094] The cutting edge 34 is S-shaped, and a fixing part 30 is provided on its upper side for fixing the wood; the lower half of the cutting edge 34 is provided with a blade edge 35 for splitting the wood.

[0095] The fixing part 30 is further away from the bidirectional rapid hydraulic cylinder 4 than the cutting edge part 35; an arc-shaped concave first cutting edge 36 is formed between the fixing part 30 and the cutting edge part 35. After the fixing part 30 is positioned, the first cutting edge 36 will pull the wood downward and tighten it, further stabilizing the wood. Its role is particularly prominent when splitting the wood into two or four pieces. The cutting edge part 35 is located close to the outer edge of the wood, which is more conducive to splitting the wood; an inwardly inclined second cutting edge 37 is formed on the lower side of the cutting edge part 35.

[0096] The wood to be split is placed in the working space 15 formed by the frame 1, baffle 2, and wood splitting axe 3. Before the wood splitting axe 3 touches the wood and after the moment when the wood needs to be split with force, the hydraulic cylinder is in a light-load or no-load condition. The power unit 5 pumps hydraulic oil into the rodless chamber 46, and the hydraulic control check valve 47 automatically opens. The hydraulic oil in the rod chamber 45 directly enters the rodless chamber 46 through the hydraulic control check valve 47. At this time, the hydraulic oil required for the increased volume of the rodless chamber 46 comes from both the external oil pump 53 and the rod chamber 45, with most of it coming from the rod chamber 45. Compared with conventional hydraulic cylinders, this achieves a faster piston rod 43 extension speed, reduces the waiting time for the wood splitting axe 3 to re-touch the wood after resetting, improves the working efficiency of the wood splitter, and drastically reduces the energy consumption of the hydraulic system, achieving environmental protection and energy saving, reducing environmental pollution. Furthermore, by reducing the amount of oil pumped in, the total demand for hydraulic oil is directly reduced, which also reduces the cost of hydraulic oil transmission and control, thereby reducing the manufacturing and operating costs of the product.

[0097] After the wood-breaking axe 3 touches the wood, the hydraulic cylinder body 41 automatically switches to heavy-load operation mode. Due to the large force on the piston rod 43, the power unit 5 continuously pumps the hydraulic oil pump 53 into the rodless chamber 46, causing the hydraulic oil pressure in the rodless chamber 46 to continuously increase. This, in turn, causes the thrust on the large piston 42 to gradually increase until the hydraulic oil pressure in the rodless chamber 46 reaches the set value P. At this point, the hydraulic control switch valve 7 on the cylinder front cover 412 opens under the action of the hydraulic oil pressure in the rodless chamber 46, connecting the rod chamber 45 with the return oil line. The previously closed rod chamber 45 is suddenly connected to the return oil line, and the hydraulic oil pressure in the rod chamber 45 can be considered to drop to 0 instantaneously. At this time, the oil pressure in the rodless chamber 46... When the oil pressure in the rod chamber 45 exceeds the oil pressure in the rodless chamber 46, the hydraulically controlled check valve 47 on the large piston 42 immediately closes automatically. All the high-pressure hydraulic oil in the rodless chamber 46 acts on the large piston 42, generating a huge thrust that instantly splits the wood, completing the heavy-load operation. After splitting, the load drops sharply, instantly switching to a light-load operation. The piston rod 43 then quickly extends, completing the wood-splitting operation. The designed hydraulically controlled switching valve 7 can automatically switch between light-load and heavy-load operation conditions by cooperating with the hydraulically controlled check valve 47, allowing the cylinder to have both high speed and huge thrust under low power drive. This fundamentally solves the contradiction between thrust, speed, and drive power under non-uniform load operation conditions.

[0098] The designed quick reset unit 8 can realize the quick reset action of the piston rod 43, reduce the waiting time of the wood splitting axe 3 reset, and further improve the working efficiency of the wood splitter.

[0099] Engine 51 provides power to oil pump 53, which draws hydraulic oil from oil tank 54 and sequentially through adapter plate 52 and oil inlet pipe to rodless chamber 46 to complete piston rod 43 extension and wood splitting operation. After wood splitting operation is completed, oil pump 53 draws hydraulic oil into the cavity of hollow perforated inner tie rod 81 to complete piston rod 43 reset action. The designed power unit 5, due to the small hydraulic oil flow required by the hydraulic system, can reduce the volume of oil tank 54. Furthermore, through the design of adapter plate 52, many connecting oil pipes 64 of existing wood splitters are eliminated, reducing the potential for oil leakage failures. Since the power of the wood splitter is not directly related to the thrust and speed, the power unit 5 of this application can be used in various sizes of wood splitters, thereby saving manufacturing and management costs.

[0100] The control unit 6 and connecting oil pipe 64 are highly integrated with the hydraulic cylinder body 41, making the product structure compact and aesthetically pleasing, while reducing manufacturing costs and minimizing the risk of hydraulic system oil leakage.

[0101] The working principle of this design is as follows: The wood to be split is placed on the wooden pallet 9, and then one piece of wood is inserted into the working space 15. The control handle 63 causes the engine 51 to drive the oil pump 53, pumping high-pressure oil through the adapter plate 52, inlet pipe, oil circuit board 60, and connecting oil pipe 64 into the rodless chamber 46. Due to the small external load, the hydraulic oil pumped into the rodless chamber 46 causes the oil pressure in the rodless chamber 46 to rise. The hydraulic oil in the rodless chamber 46 pushes the large piston 42 to slide. At this time, the rod chamber 45 is completely closed, and the hydraulic oil pressure in the rod chamber 45 rises rapidly until the hydraulic oil in the rod chamber 45 reaches its maximum pressure. The pressure is greater than the pressure of the hydraulic oil in the rodless chamber 46. The oil pressure in the rod chamber 45 acts on the first steel ball 471 and overcomes the elastic force of the first spring 472 to push the first steel ball 471 open. At this time, the hydraulic oil in the rod chamber 45 directly enters the rodless chamber 46 through the first through hole 4411. Since most of the hydraulic oil in the rodless chamber 46 will come from the rod chamber 45, the oil pump flow rate only needs to be equivalent to one-seventh of the flow rate of a conventional oil cylinder to obtain a faster ejection speed than a conventional oil cylinder. Therefore, a small flow rate is used to drive the piston rod 43 to quickly eject until the wood-breaking axe 3 touches the wood.

[0102] When the wood-breaking axe 3 comes into contact with the wood, the oil pump 53 continues to pump hydraulic oil into the rodless chamber 46. Due to the large load, the piston rod 43 and the large piston 42 remain stationary until the hydraulic oil pressure in the rodless chamber 46 rises to the set value P. At this time, the hydraulic oil in the rodless chamber 46, through the oil passage (i.e., the oil passage connecting the oil pipe 64 and the oil passage plate 60), exerts force on the thrust control rod valve core 72 in the oil passage plate 60. The thrust control rod valve core 72 exerts force on the second steel ball 73, so that the second steel ball 73 overcomes the elasticity of the second spring 74 and no longer blocks the third through hole 601. The rod chamber 45 and the return oil pipe are connected through the third through hole 601 and the second through hole 711. The hydraulic oil pressure in the rod chamber 45 drops rapidly. At this time, the hydraulic oil pressure in the rodless chamber 46 is greater than that in the rod chamber. The hydraulic oil pressure in chamber 45 causes the hydraulic control check valve 47 on the large piston 42 to close automatically. All the high-pressure hydraulic oil in the rodless chamber 46 acts on the large piston 42, generating a huge thrust. The wood-splitting axe 3 splits the wood. When the wood is split instantly, the load on the cylinder immediately decreases. At this time, the oil pressure in the rodless chamber 46 drops accordingly. The hydraulic pressure on the thrust control rod valve core 72 is less than the elastic force of the second spring 74. The second steel ball 73 immediately resets and closes the second through hole, causing the rod chamber 45 to be closed again. Once the rod chamber 45 is closed, its oil pressure immediately rises and exceeds the pressure in the rodless chamber 46, directly pushing open the first steel ball 471, allowing all the hydraulic oil in the rod chamber 45 to flow into the rodless chamber 46, quickly pushing the piston rod 43 out completely, and splitting the wood completely.

[0103] After the wood is completely split, the piston rod 43 needs to be reset. At this time, the control handle 63 is operated so that the high-pressure oil pumped by the oil pump 53 driven by the engine 51 passes through the adapter plate 52 and the oil inlet pipe into the inner cavity of the hollow perforated inner rod 81 and enters the reset area 821. Then, the piston rod 43 and the large piston 42 are quickly pulled back under the action of hydraulic oil. At this time, the hydraulic oil in the reset area 821 applies force to the push rod assembly 442 through the control oil hole 4412, so that the push rod assembly 442 pushes the first steel ball 471 to move. The first steel ball 471 overcomes the elastic force of the first spring 472 and no longer blocks the first through hole 4411. The hydraulic oil in the rodless cavity 46 enters the rod cavity 45 directly through the first through hole 4411. The piston rod 43 drives the wood-breaking axe 3 to reset smoothly and quickly.

[0104] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.

[0105] It should be noted that the structures, proportions, and sizes depicted in the accompanying drawings are solely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the implementation of this technical solution and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this technical solution, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms used in this specification, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity and not intended to limit the scope of implementation of this technical solution. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the technical solution's implementation.

[0106] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0107] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

Claims

1. A bidirectional rapid hydraulic cylinder, characterized in that, include: Hydraulic cylinder body (41); The large piston (42) is slidably disposed within the hydraulic cylinder body (41) and divides the inner cavity of the hydraulic cylinder body (41) into a rod chamber (45) and a rodless chamber (46). A piston rod (43) is telescopically mounted on the hydraulic cylinder body (41), and the end of the piston rod (43) extends into the rod chamber (45) and is connected to the large piston (42); A hydraulically controlled check valve (47) is mounted on the large piston (42) to connect the rod chamber (45) and the rodless chamber (46). When hydraulic oil enters the rodless chamber (46) from the oil pump (53) and drives the large piston (42) to move, the oil pressure in the rod chamber (45) increases and causes the hydraulic check valve (47) to open, thereby allowing the hydraulic oil in the rod chamber (45) to enter the rodless chamber (46) through the hydraulic check valve (47) and push the large piston (42) to move.

2. The bidirectional rapid hydraulic cylinder according to claim 1, characterized in that, Also includes: The quick reset unit (8) is used to control the hydraulic oil in the rodless chamber (46) to return to the rod chamber (45) through the hydraulic check valve (47); the quick reset unit (8) includes a hollow perforated inner rod (81), a small piston (82), a push rod seat (441) and a push rod assembly (442). The piston rod (43) is hollow; One end of the hollow perforated inner tie rod (81) is connected to the cylinder rear cover (413) of the hydraulic cylinder body (41), and the other end passes through the large piston (42) and extends into the inner cavity of the piston rod (43), and the hollow perforated inner tie rod (81) is slidably connected to the large piston (42). The large piston (42) is provided with a mounting cavity (421), and a push rod seat (441) and a push rod assembly (442) are provided in the mounting cavity (421). The middle part of the push rod seat (441) and the push rod assembly (442) forms an oil passage (443) connecting the rod chamber (45) and the hydraulic control check valve (47). The part of the push rod seat (441) adjacent to the hydraulic control check valve (47) is a guide part two (4413). An auxiliary piston chamber (422) is formed between the periphery of the guide part two (4413) and the side wall of the mounting cavity (421). One end of the push rod assembly (442) is provided in the auxiliary piston chamber (422) and forms a piston part. The other end of the push rod assembly (442) faces the hydraulic control check valve (47). The small piston (82) is connected to one end of the hollow perforated inner pull rod (81), and the periphery of the small piston (82) is slidably connected to the inner wall of the piston rod (43). The small piston (82) divides the inner cavity of the piston rod (43) into a reset area (821) and a relief area (822). The reset area (821) is connected to the oil passage inside the hollow perforated inner tie rod (81); The piston rod (43) is provided with a control oil hole (4412), which is connected to the reset area (821). The control oil hole (4412) enables the oil passage between the reset area (821) and the auxiliary piston chamber (422). When the hydraulic oil in the reset area (821) enters the auxiliary piston chamber (422), the push rod assembly (442) drives the hydraulic control check valve (47) to open.

3. A bidirectional rapid hydraulic cylinder according to claim 2, characterized in that: The hydraulic cylinder body (41) is provided with a control unit (6), which includes a control valve (61). The control valve (61) is plate-connected to the cylinder front cover (412) of the hydraulic cylinder body (41). The control valve (61) and the cylinder rear cover (413) are connected by two connecting oil pipes (64). The control valve (61) is used to control the connecting oil pipes (64) to supply oil to the rodless chamber (46) or the reset area (821) respectively.

4. A bidirectional rapid hydraulic cylinder according to any one of claims 1-3, characterized in that: The hydraulic check valve (47) includes a first steel ball (471) and a first spring (472). The large piston (42) has a first through hole (4411), and the rodless chamber (46) is connected to the rod chamber (45) through the first through hole (4411); One end of the first spring (472) is connected to the large piston (42), and the other end is connected to the first steel ball (471) to block the first through hole (4411).

5. A bidirectional rapid hydraulic cylinder according to claim 3, characterized in that: The control unit (6) or the cylinder front cover (412) is integrated with a hydraulic control switch valve (7). When the hydraulic oil pressure in the rodless chamber (46) reaches the set value P, the hydraulic control switch valve (7) connects the rod chamber (45) to the return oil line. The cylinder front cover (412) is provided with a second through hole (711), and the rod chamber (45) and the oil return line are connected through the second through hole (711); The control valve (61) is connected to an oil circuit board (60), the oil circuit board (60) is installed on the front cover (412) of the oil cylinder, and the oil circuit board (60) is provided with a third through hole (601), the return oil pipeline and the second through hole (711) are connected through the third through hole (601); The hydraulic control switch valve (7) includes: a thrust control push rod valve core (72), a second steel ball (73), and a second spring (74); one end of the second spring (74) is connected to the oil circuit board (60), and the other end is connected to the second steel ball (73), which is used to block the third through hole (601) by the second steel ball (73). The thrust control push rod valve core (72) is slidably connected to the oil circuit plate (60), and the push rod of the thrust control push rod valve core (72) can pass through the third through hole (601) and abut against the second steel ball (73).

6. A bidirectional rapid hydraulic cylinder according to claim 5, characterized in that: The hydraulic cylinder body (41) includes a cylinder body (411), a cylinder front cover (412) mounted on the cylinder body (411), a cover, and a control valve (61) plate-connected to the cylinder front cover (412). The cylinder body (411) includes: a cylinder steel pipe (414) and a cylinder rear cover (413). The cylinder steel pipe (414), the cylinder rear cover (413), and two connecting oil pipes (64) are welded together. The cylinder rear cover (413) is provided with an oil ejection hole that connects the rodless chamber (46) and the control valve (61), and a retraction oil hole that connects the hollow inner rod (81) with a hole and the control valve (61). The two connecting oil pipes (64) are inserted into the control valve (61).

7. A wood splitting machine characterized in that, include: The frame (1), baffle (2), wood-breaking axe (3), bidirectional fast hydraulic cylinder (4) as described in any one of claims 1-6, and power unit (5); A bidirectional fast hydraulic cylinder (4) is mounted on the frame (1), a baffle (2) is mounted on the frame (1), and a wood-breaking axe (3) is mounted on the drive end of the bidirectional fast hydraulic cylinder (4). A working space (15) for placing wood is formed between the frame (1), the baffle (2), and the wood-breaking axe (3). A power unit (5) is mounted on the frame (1) to provide power to the bidirectional fast hydraulic cylinder (4). The frame (1) has a main beam (11), the main beam (11) base is an H-shaped material, the tail end of the main beam (11) is bent and curved upwards, and the tail end of the main beam (11) is inlaid and welded with a tail plate (12). The tail plate (12) is provided with reinforcing plates (13) on both sides, and the end of the bidirectional fast oil cylinder (4) is installed on the reinforcing plate (13) and the tail plate (12). The main beam (11) is provided with reinforcing ribs (14) on both sides. The upper end of the reinforcing ribs (14) is bent and placed above the main beam (11) to form a guide rail (17) for the wood-breaking axe (3) to slide. Guide plates (16) are inclinedly provided on both sides of the main beam (11). The guide plates (16) are located between the guide rail (17) and the baffle (2), and the upper part of the guide plates (16) is bent. The guide plates (16) are used for the wood fence to fall from the upper end of the main beam (11).

8. A wood splitter according to claim 7, characterized in that: The power unit (5) includes an engine (51), a converter plate (52), an oil pump (53), and an oil tank (54); the oil pump (53) is located inside the oil tank (54) and is integrated with the engine (51) through the converter plate (52); The engine (51) is connected to the frame (1); One side of the adapter plate (52) is connected to the engine (51), and the other side is connected to the oil pump (53); The oil tank (54) is covered on the outer periphery of the oil pump (53), and the oil tank (54) is connected to the adapter plate (52); The oil pump (53) is connected to the control unit (6) in sequence through the adapter plate (52) and the oil pipeline, and the control unit (6) delivers hydraulic oil to the reset area (821) or the rodless chamber (46) respectively.

9. A wood splitter according to claim 7, characterized in that: The wood-breaking axe (3) is S-shaped like an eagle's beak and includes a force-bearing body (31), a guide part (32) and a blade part (33). The guide part (32) is located below the force-bearing body (31) and the blade part (33) and is set horizontally. The force-bearing body (31) is set vertically above the guide part (32). The blade part (33) is set on the side of the force-bearing body (31) away from the bidirectional fast oil cylinder (4). The front end of the blade part (33) is provided with a cutting edge (34). The cutting edge (34) is S-shaped, and a fixing part (30) is provided on its upper side. The fixing part (30) is used to fix the wood. The lower half of the cutting edge (34) is provided with a blade edge (35), which is used to split the wood. The fixing part (30) is further away from the bidirectional fast cylinder (4) than the cutting edge part (35); an arc-shaped concave first cutting edge (36) is formed between the fixing part (30) and the cutting edge part (35); and an inwardly inclined second cutting edge (37) is formed on the lower side of the cutting edge part (35).

10. A wood splitter according to claim 7, characterized in that: The baffle (2) has several reinforcing ribs (21) on the side away from the wood-breaking axe (3), and the several reinforcing ribs (21) are connected end to end and welded to form a reinforcing ring (22). The inner walls of the reinforcing ring (22) are welded together by the reinforcing ribs (21).

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