Combined type hydraulic cylinder with quick boosting function

Abstract

The invention relates to the technical field of hydraulic cylinders, in particular to a combined type hydraulic cylinder with a quick boosting function, which comprises a boosting cavity, a reverse piston, a connecting assembly and a limiting assembly, the pressurizing cavity is formed in the inner wall of the main cylinder body; the reverse piston is slidably mounted in the pressurizing cavity; the connecting assembly is connected between the reverse piston and the main piston; the limiting assembly is connected with the connecting assembly; hydraulic oil in the flow guide cavity is pumped out by a section of movement of the reverse piston in the same direction as that of the main piston, the hydraulic pressure in the flow guide cavity is reduced, the hydraulic pressure in the driving cavity can be rapidly increased, and then the reverse piston performs a section of movement in the direction opposite to that of the main piston to pressurize and guide the pumped hydraulic oil to the driving cavity. The pressure drop phenomenon is reduced, the flow of the driving cavity is increased, and the thrust to the main piston is improved; therefore, the problem that when a single small-flow hydraulic pump is used, the hole diameter is directly reduced to help the hydraulic cylinder to rapidly boost pressure, so that the pressure drop phenomenon is caused, and rapid pressure boosting cannot be effectively assisted is solved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, in particular to a composite hydraulic cylinder with a rapid pressure-raising function. Background Art

[0002] With the industrial revolution and the popularization of mechanized production, hydraulic technology has developed rapidly. Hydraulic cylinders, as key components in hydraulic transmission systems, are widely used in various mechanical equipment, especially in the fields of automobile manufacturing, aviation, and shipbuilding. Hydraulic cylinders mainly convert hydraulic energy into mechanical energy by applying external force to the liquid in the hydraulic cylinder, thereby driving the hydraulic cylinder piston to perform linear motion to complete mechanical work.

[0003] When hydraulic cylinders are used in automobile braking systems and suspension systems, they need to be able to respond quickly to ensure the safety and comfort of the vehicle. For scenes that require high efficiency and high response speed, the purpose of rapid pressure increase is currently mainly achieved by adjusting the displacement and speed of the hydraulic pump. However, when using a hydraulic pump with a large displacement and high pressure, on the one hand, energy consumption will increase. On the other hand, a hydraulic pump with a large displacement has a large output flow, which will increase the difficulty of flow control, resulting in unstable pressure output that affects normal operation. If multiple hydraulic pumps are used to increase the speed at which hydraulic oil enters the hydraulic cylinder, on the one hand, the cost will increase, and on the other hand, the floor space will increase. Mechanical structures with smaller spaces will not be able to be installed well; the prior art has proposed good solutions, such as a double-rod fast hydraulic cylinder with patent publication number CN104405721B, which helps to quickly increase the oil pressure in the fast cylinder by setting a fast cylinder with a diameter smaller than the main cylinder, and uses the small piston in the fast cylinder to help push the large piston to perform linear motion, and a plurality of oil holes are opened on the cylinder seat. When hydraulic oil is introduced into different oil holes, the piston is driven to perform linear motion; at this time, only a small-flow hydraulic pump needs to be used in conjunction to obtain a faster speed at a smaller thrust, a larger thrust at a slow speed, and a faster return speed, thereby improving the response speed and work efficiency.

[0004] Although the existing technology has solved the problem that the traditional hydraulic cylinder cannot quickly increase the pressure when using a small-flow hydraulic pump, the following problems still exist: when only a single small-flow hydraulic pump can be used in the aviation system, the pressure is quickly increased by using a cylinder body with a built-in diameter smaller than the main cylinder body, thereby driving the piston to respond quickly and slide. Although flowing through a small aperture can increase the flow rate, according to the Bernoulli principle, the increase in flow rate will cause its pressure to drop, and the increased friction between the hydraulic oil and the hole wall will cause the pressure to drop. The hydraulic oil produces a pressure drop and cannot quickly increase the pressure. At this time, the piston in the cylinder body with a smaller diameter cannot be effectively pushed, thereby failing to help the piston assembly to slide effectively linearly, and failing to effectively improve the response speed and work efficiency.

[0005] In view of the above situation, in order to overcome the above technical problems, the present invention designs a compound hydraulic cylinder with a rapid pressure boosting function. Summary of the invention

[0006] The present invention provides a compound hydraulic cylinder with a rapid pressure-raising function, which solves the problem that when a single small-flow hydraulic pump is used, directly reducing the aperture to help the hydraulic cylinder to rapidly increase pressure will cause a pressure drop phenomenon, thereby failing to effectively help to rapidly increase pressure. The reverse piston performs a movement in the same direction as the main piston to extract the hydraulic oil in the diversion chamber, rapidly reduce the hydraulic pressure in the diversion chamber, and rapidly increase the hydraulic pressure in the drive chamber. Subsequently, the reverse piston performs a movement in the opposite direction to the main piston to pressurize and guide the extracted hydraulic oil to the drive chamber, guide the hydraulic oil in the drive chamber to reduce the pressure drop phenomenon, and at the same time increase the flow rate in the drive chamber and improve the thrust on the main piston.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A composite hydraulic cylinder with a rapid pressure-increasing function comprises a main cylinder body, a cylinder head, an oil inlet passage and a main piston, and also comprises a pressure-increasing chamber, a reverse piston, a connecting assembly and a limiting assembly; the pressure-increasing chamber is arranged on the inner wall of the main cylinder body; the reverse piston is slidably installed in the pressure-increasing chamber; the connecting assembly is connected to the reverse piston; the limiting assembly is connected to the main piston; the hydraulic oil enters the main cylinder body from the oil inlet passage to push the main piston to slide, the sliding of the main piston drives the limiting assembly to slide, the sliding of the connecting assembly drives the reverse piston to slide in the same direction as the main piston through the connecting assembly to suck the hydraulic oil on the right side of the main piston into the pressure-increasing chamber, thereby quickly helping to reduce the pressure on the right side of the main piston, so that the left side of the main piston can be quickly pressure-increasing, the connecting assembly slides to the position of the limiting assembly, the limiting assembly squeezes the connecting assembly to separate the connecting assembly and the reverse piston, and after the connecting assembly is separated from the reverse piston, the reverse piston slides in the opposite direction of the movement direction of the main piston to press the hydraulic oil into the left side of the main piston.

[0009] Preferably, the main piston is slidably installed in the main cylinder body, the left side of the main piston is a driving chamber, and the right side is a guide chamber; the boost chamber includes an annular chamber, a boost channel and a guide channel; the annular chamber is opened on the inner wall of the main cylinder body; the boost channel is connected between the annular chamber and the driving chamber; the guide channel is connected between the annular chamber and the guide chamber.

[0010] In the above scheme, hydraulic oil is injected into the driving chamber to make the main piston slide to the right. At this time, the driving chamber space increases and the guide chamber space decreases. The hydraulic oil in the guide chamber is squeezed by the main piston to increase its pressure, and enters the annular chamber from the guide channel to relieve pressure. The hydraulic oil entering the annular chamber enters the driving chamber on the left through the boosting channel, further increasing the pressure of the hydraulic oil in the driving chamber.

[0011] Preferably, the circumferential array of boost channels is opened on the annular cavity, the boost channels are of a conical structure, and the axes of the boost channels are inclined to the axes of the main cylinder body and face the direction of the guide cavity.

[0012] In the above scheme, the hydraulic oil flowing out of the boosting channel is pressurized and flows out under the action of the conical structure. Since multiple boosting channels are opened in a circular array, the outflowing hydraulic oil will not cause local pressure loss in the driving chamber, and the flow direction of the hydraulic oil flowing out of the boosting channel is toward the main piston, which can quickly pressurize the main piston, thereby achieving the purpose of rapid response.

[0013] Preferably, the connecting assembly includes a movable slide groove, a compression spring and a sealing ring block; the movable slide groove is opened on the inner wall of the guide cavity; the compression spring is connected between the reverse piston and the tail end of the annular groove; the sealing ring block is connected to the reverse piston.

[0014] In the above scheme, when the main piston moves to the right, the pressure in the guide chamber increases, the main piston and the sealing ring block come into contact and push the sealing ring block to drive the reverse piston to move to the right, and the reverse piston moves to the right, so that the pressure in the annular chamber decreases, causing the hydraulic oil to flow from the guide chamber into the annular chamber. At this time, the main piston is sucked by the suction force of the reverse piston, so that the hydraulic oil quickly enters the drive chamber, thereby increasing the pressure increase speed.

[0015] Preferably, a rubber valve 1 is provided at the boosting channel; a rubber valve 2 is provided at the guide channel, the guide channel structure is the same as the boosting channel, and the guide channel is connected to the driving chamber when the reverse piston moves in the opposite direction to the main piston.

[0016] In the above scheme, the initial state of the boost channel and the guide channel is kept closed by the rubber valve, so that during the reverse piston movement, the guide channel is used to provide suction to suck the hydraulic oil in the guide cavity into the annular cavity to help quickly increase the pressure.

[0017] Preferably, the rubber valve 1 is a hard structure on the side facing the annular cavity and cannot be opened toward the annular cavity; and the rubber valve 2 is a soft structure and can be opened to both sides under pressure.

[0018] In the above scheme, when the reverse piston slides in the same direction as the main piston to extract the hydraulic oil, the rubber valve cannot be opened to one side of the annular cavity, thereby avoiding the hydraulic oil from entering the annular cavity from the drive cavity due to the suction effect caused by the hydraulic oil pressure of the oil inlet channel and the reduction of the internal air pressure of the annular cavity caused by the sliding of the reverse piston; the rubber valve 2 is a double-sided openable structure to ensure that when the pressure of the guide cavity is greater than the pressure of the annular cavity, the hydraulic oil can enter the annular cavity through the guide channel.

[0019] Preferably, the elastic modulus of the compression spring satisfies that when the reverse piston slides in the opposite direction to the main piston, the pressure of the compression spring on the hydraulic oil is greater than the opening pressure of the rubber valve 1 and the rubber valve 2.

[0020] In the above scheme, when the reverse piston is under the action of the restoring force of the compression spring itself, it can pressurize the hydraulic oil in the annular cavity and slide in the opposite direction of the main piston. At this time, the pressure of the hydraulic oil can open rubber valve 1 and rubber valve 2; the compression spring can buffer the sudden movement of the piston in the initial stage (that is, when the hydraulic oil just enters the drive cavity) to avoid damage caused by sudden start-up.

[0021] Preferably, the limit assembly includes a connecting slider, a push ring and a seal; the connecting slider is connected to the reverse piston; the push ring includes a fixed ring, a retractable slider and a connecting spring; the fixed ring is connected to the main piston; the two retractable sliders are slidably mounted on the fixed ring; the connecting spring is connected between the two retractable sliders; and the seal is slidably mounted in the movable slide groove.

[0022] In the above scheme, the connecting ring block is pushed by the push ring, so that the connecting ring block can drive the reverse piston to slide along with the main piston. When the reverse piston slides to the tail position of the movable slide groove, the push ring can be controlled by the limit guide rail, and then the reverse piston can slide in the reverse direction under the restoring force of the compression spring.

[0023] Preferably, the sealing member comprises a sealing groove, a sealing strip and a sealing spring; the sealing groove is provided at both ends of the movable groove; the sealing strip is slidably installed in the sealing groove; and the sealing spring is connected between the sealing strip and the sealing spring.

[0024] In the above scheme, the sealing member is used to ensure that the connecting ring block can keep the movable slide groove position sealed during the sliding process, so that the boosting effect can be improved when the reverse piston slides in the reverse direction with the main piston.

[0025] Preferably, a contraction slope is provided on the top of the contraction slider; and the elastic modulus of the connection spring satisfies that the reverse piston will not contract when sliding in the same direction as the main piston.

[0026] In the above scheme, the contraction inclined surface can help the connecting slider to contract quickly when it is limited by the movable slide groove, thereby disengaging from the connecting slider, so that the connecting slider can slide in the opposite direction under the action of the compression spring to pressurize the hydraulic oil into the driving chamber for pressurization.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Compared with the existing hydraulic cylinder, the present invention has an annular cavity on the outer ring of the main cylinder body. During the operation of the hydraulic cylinder, there is hydraulic oil in the cavities on both sides of the main piston. When the main piston moves, it first drives the reverse piston in the annular cavity to move in the same direction. The hydraulic oil in the cavity in the direction of the main piston movement is sucked into the annular cavity, thereby quickly reducing the hydraulic pressure in the guide cavity, increasing the sliding speed of the main piston and realizing rapid pressure increase; after sliding in the reverse direction to a certain position, it slides in the opposite direction to the main piston, thereby quickly pressing the extracted hydraulic oil into the driving cavity, further increasing the pressure increase speed, and the rapid pressure increase of the main piston becomes a staged pressure increase, thereby ensuring that the pressure increase process of the hydraulic cylinder is smoother and avoiding direct pressure increase resulting in a decrease in the life of the main piston.

[0029] 2. The present invention sets a guide channel and a boost channel, and the hydraulic oil flowing out of the boost channel is directed toward the main piston, thereby ensuring that the driving chamber increases the amount of hydraulic oil entering, and can guide the hydraulic oil originally entering the driving chamber from the oil inlet channel, so that the main piston can slide quickly, reducing the pressure drop effect caused by the friction between the hydraulic oil in the driving chamber and the inner wall of the main cylinder; the guide channel and the boost channel have the same structure, and after the guide channel completes the air extraction to reduce the pressure in the guide chamber, the main piston slides through the guide channel position, and at this time, the guide channel realizes the same function as the boost channel during the reverse piston compression process, and because the guide channel is located closer to the main piston, the main piston can achieve the purpose of rapid pressure increase under the action of the hydraulic oil pressed out of the guide channel.

[0030] 3. The present invention sets a limit assembly so that the thrust effect of the main piston on the reverse piston is separated after the reverse piston moves to the specified position, so that the reverse piston can slide in the opposite direction of the main piston under the action of the compression spring, thereby realizing the rapid introduction of the hydraulic oil in the driving chamber, and the hydraulic oil in the compression spring and the guide chamber can reduce the damage caused by the sudden start of the hydraulic cylinder; on the other hand, during the retraction of the main piston, since the rubber valve 2 can be opened in both directions and the opening pressure is relatively low, part of the hydraulic oil can be introduced into the annular chamber during the retraction process, and a certain amount of hydraulic oil is stored in the annular chamber, so that when the annular chamber injects hydraulic oil into the driving chamber, no air is injected, thereby improving the stability of the main piston operation, avoiding air from entering the driving chamber, making the compressibility of the driving chamber increased and reducing the pressure increase speed, and at the same time, since part of the hydraulic oil can be pressed into the annular chamber during the return of the main piston, the quick retraction effect of the return of the main piston is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 is a cross-sectional view of the present invention;

[0034] Figure 3 It is a schematic diagram of the internal structure of the main cylinder of the present invention;

[0035] Figure 4 It is a schematic diagram of the structure of the driving cavity and the guide cavity of the present invention;

[0036] Figure 5 It is a schematic diagram of the structure of the boost channel and the guide channel of the present invention;

[0037] Figure 6 for Figure 2 A magnified view of the structure at center;

[0038] Figure 7 for Figure 4 A magnified view of the structure at B in the middle;

[0039] Figure 8 This is a schematic diagram of the hydraulic oil flow direction when the reverse piston moves in the same direction as the main piston;

[0040] Fig. 9 It is a schematic diagram of the hydraulic oil flow direction when the reverse piston moves in the opposite direction to the main piston;

[0041] In the figure: 1. main cylinder body; 11. driving chamber; 12. guide chamber; 2. cylinder head; 3. oil inlet channel; 4. main piston; 5. boost chamber; 51. annular chamber; 52. boost channel; 521. rubber valve 1; 53. guide channel; 531. rubber valve 2; 6. reverse piston; 7. connecting assembly; 71. movable slide groove; 72. compression spring; 73. connecting slider; 8. limit assembly; 81. push ring; 811. fixing ring; 812. contraction slider; 8121. contraction ramp; 813. connecting spring; 82. sealing element; 821. sealing slide groove; 822. sealing strip; 823. sealing spring. DETAILED DESCRIPTION

[0042] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] See also Figures 1 to 9 The present invention provides a composite hydraulic cylinder with a rapid pressure-increasing function, and the technical solution is as follows:

[0044] As a specific embodiment of the present invention, refer to Figure 1 and Figure 2 A composite hydraulic cylinder with a rapid pressure-increasing function comprises a main cylinder body 1, a cylinder head 2, an oil inlet passage 3 and a main piston 4, and also comprises a pressure-increasing chamber 5, a reverse piston 6, a connecting assembly 7 and a limiting assembly 8; the pressure-increasing chamber 5 is arranged on the inner wall of the main cylinder body 1; the reverse piston 6 is slidably installed in the pressure-increasing chamber 5; the connecting assembly 7 is connected to the reverse piston 6; the limiting assembly 8 is connected to the main piston 4; the hydraulic oil enters the main cylinder body 1 from the oil inlet passage 3 to push the main piston 4 to slide, and the main piston 4 slides through the connecting assembly 7 and the limiting assembly 8 to drive the reverse piston 6 to move in the same direction to suck the hydraulic oil on the right side of the main piston 4 into the pressure-increasing chamber 5, thereby reducing the pressure on the right side of the main piston 4 and increasing the pressure on the left side of the main piston 4, helping the main piston 4 to slide quickly, and the connecting assembly 7 slides to the position of the limiting assembly 8, and the limiting assembly 8 squeezes the connecting assembly 7 to separate the connecting assembly 7 and the reverse piston 6. After the connecting assembly 7 and the reverse piston 6 are separated, the reverse piston 6 slides in the opposite direction to the movement direction of the main piston 4 to press the hydraulic oil into the left side of the main piston 4.

[0045] As a specific embodiment of the present invention, refer to Figure 2 , Figure 3 and Figure 4, the main piston 4 is slidably installed in the main cylinder body 1, the left side of the main piston 4 is the driving chamber 11, and the right side is the guide chamber 12; the boost chamber 5 includes an annular chamber 51, a boost channel 52 and a guide channel 53; the annular chamber 51 is opened on the inner wall of the main cylinder body 1, and a certain amount of hydraulic oil is stored in the annular chamber 51 when the main piston 4 and the reverse piston 6 are in the initial position, so as to avoid that when the hydraulic oil in the guide chamber 12 is extracted, the space in the annular chamber 51 cannot be completely filled, resulting in the hydraulic oil in the annular chamber 51 being discharged to the driving chamber 11, and the gas is discharged into the driving chamber 11 together. Due to the high compressibility of the gas, the sliding process of the main piston 4 is easily unstable. Storing hydraulic oil in the annular chamber 51 at the beginning can well avoid this situation; the boost channel 52 is connected between the annular chamber 51 and the driving chamber 11; the guide channel 53 is connected between the annular chamber 51 and the guide chamber 12. Hydraulic oil is injected into the driving chamber 11 to make the main piston 4 slide to the right. At this time, the space of the driving chamber 11 increases, and the space of the guide chamber 12 decreases. The hydraulic oil in the guide chamber 12 is squeezed by the main piston 4 to increase its pressure, and enters the annular chamber 51 from the guide channel 53 to relieve pressure. The hydraulic oil entering the annular chamber 51 enters the driving chamber 11 on the left side through the boosting channel 52, so that the hydraulic oil pressure in the driving chamber 11 is further increased.

[0046] As a specific embodiment of the present invention, refer to Figure 4 and Figure 5 The boosting channels 52 are arranged in a circumferential array on the annular cavity 51. The boosting channels 52 are of a conical structure and the axis of the boosting channels 52 is inclined to the axis of the main cylinder 1 and faces the direction of the guide cavity 12. The hydraulic oil flowing out of the boosting channels 52 is pressurized and flows out under the action of the conical structure. Since the multiple boosting channels 52 are arranged in a circumferential array, the hydraulic oil flowing out will not cause local pressure loss in the driving cavity 11, and the hydraulic oil flowing out of the boosting channels 52 flows toward the main piston 4, which can quickly pressurize the main piston 4, thereby achieving the purpose of rapid response.

[0047] As a specific embodiment of the present invention, refer to Figure 3 and Figure 6, the connecting assembly 7 includes an active slide groove 71, a compression spring 72 and a connecting slider 73; the active slide groove 71 is opened on the inner wall of the guide chamber 12; the compression spring 72 is connected between the reverse piston 6 and the tail end of the annular groove; the connecting slider 73 is connected to the reverse piston 6; when the main piston 4 moves to the right, the pressure in the guide chamber 12 increases, the main piston 4 and the sealing ring block come into contact and push the sealing ring block to drive the reverse piston 6 to move to the right, the reverse piston 6 moves to the right, the pressure in the annular chamber 51 decreases, and the hydraulic oil flows from the guide chamber 12 into the annular chamber 51. At this time, the main piston 4 is sucked under the suction force of the reverse piston 6, so that the hydraulic oil quickly enters the drive chamber 11, thereby increasing the pressure increase speed.

[0048] As a specific embodiment of the present invention, refer to Figure 5 , a rubber valve 1 521 is provided at the position of the boosting channel 52; a rubber valve 2 531 is provided at the position of the diversion channel 53, and the structure of the diversion channel 53 is the same as that of the boosting channel 52, and the diversion channel 53 is connected with the driving chamber 11 when the reverse piston 6 moves in the opposite direction to the main piston 4. The boosting channel 52 and the diversion channel 53 are kept in a sealed state at the initial state by the rubber valve 1 521 and the rubber valve 2 531, so that during the movement of the reverse piston 6, the diversion channel 53 is used to provide suction to suck the hydraulic oil in the diversion chamber 12 into the annular chamber 51 to help quickly increase the pressure, and because the structure of the diversion channel 53 is the same as that of the boosting channel 52, on the one hand, the flow direction of the drawn hydraulic oil can be made.

[0049] As a specific embodiment of the present invention, refer to Figure 4 and Figure 5 The rubber valve 1 521 is a hard structure facing the annular cavity 51 and cannot be opened toward the annular cavity 51; the rubber valve 2 531 is a soft structure and can be opened toward both sides under pressure. When the reverse piston 6 slides in the same direction as the main piston 4 to extract hydraulic oil, since the rubber valve cannot be opened toward the annular cavity 51, it can avoid the hydraulic oil from the driving cavity 11 entering the annular cavity 51 due to the suction effect caused by the hydraulic oil pressure of the oil inlet channel 3 and the reduction of the internal air pressure of the annular cavity 51 caused by the sliding of the reverse piston 6; the rubber valve 2 531 is a double-sided openable structure to ensure that when the pressure of the diversion cavity 12 is greater than the pressure of the annular cavity 51, the hydraulic oil can enter the annular cavity 51 through the diversion channel 53.

[0050] As a specific embodiment of the present invention, refer to Figure 3 and Figure 5The elastic modulus of the compression spring 72 satisfies that when the reverse piston 6 slides in the opposite direction to the main piston 4, the pressure of the compression spring 72 on the hydraulic oil is greater than the opening pressure of the rubber valve 1 521 and the rubber valve 2 531. On this basis, the elastic modulus is ensured to be as small as possible, so as to ensure that the resistance to the sliding of the main piston 4 generated by the elastic force of the compression spring 72 is as small as possible, and then to ensure that the compression spring 72 and the hydraulic oil in the guide chamber 12 can help maintain stable sliding when the main piston 4 slides. When the reverse piston 6 is under the action of the self-restoring force of the compression spring 72, it can pressurize the hydraulic oil in the annular chamber 51 and slide in the opposite direction to the main piston 4. At this time, the pressure of the hydraulic oil can open the rubber valve 1 521 and the rubber valve 2 531; the compression spring 72 can buffer the sudden movement of the piston in the initial stage (that is, when the hydraulic oil just enters the driving chamber 11) to avoid damage caused by sudden start-up. At the same time, the opening pressure of the rubber valve 2 531 toward the annular chamber 51 satisfies that the hydraulic oil flows out of the oil inlet channel 3 on one side of the guide chamber 12, and can also open the rubber valve 2 531.

[0051] As a specific embodiment of the present invention, refer to Figure 4 and Figure 6 The limiting assembly 8 includes a push ring 81 and a sealing member 82; the push ring 81 includes a fixed ring 811, a retractable slider 812 and a connecting spring 813; the fixed ring 811 is connected to the main piston 4; the two retractable sliders 812 are slidably mounted on the fixed ring 811; the connecting spring 813 is connected between the two retractable sliders 812; and the sealing member 82 is slidably mounted in the movable slide groove 71. The connecting slider 73 is pushed by the push ring 81, so that the connecting slider 73 can drive the reverse piston 6 to slide with the main piston 4. When the reverse piston 6 slides to the tail position of the movable slide groove 71, the connecting slider 73 is limited by the movable slide groove 71. At this time, the extrusion force between the retractable slider 812 and the connecting slider 73 increases, thereby retracting the retractable slider 812 and the connecting slider 73 to separate.

[0052] As a specific embodiment of the present invention, refer to Figure 3 , Figure 6 and Figure 7The sealing member 82 includes a sealing groove 821, a sealing strip 822 and a sealing spring 823; the sealing groove 821 is provided at both ends of the movable groove 71; the sealing strip 822 is slidably installed in the sealing groove 821; the sealing spring 823 is connected between the sealing strip 822 and the sealing spring 823. The sealing member 82 ensures that the movable groove 71 is always sealed during the sliding process of the connecting slider 73, so that the pressure-boosting effect can be improved when the reverse piston 6 is sliding in the reverse direction with the main piston 4. In order to further improve the sealing effect, the sealing strip 822 and the connecting slider 73 can be set to magnetic materials, so as to ensure that even if the main cylinder body 1 vibrates during the sliding process, the sealing strip 822 can maintain the sealing effect of the connecting slider 73.

[0053] As a specific embodiment of the present invention, refer to Figure 3 and Figure 6 , the top of the shrinking slider 812 is provided with a shrinking inclined surface 8121; the elastic modulus of the connecting spring 813 is such that the reverse piston 6 will not shrink when sliding in the same direction as the main piston 4. The shrinking inclined surface 8121 can help the connecting slider 73 to shrink quickly when it is limited by the movable slide groove 71, so as to detach from the connecting slider 73, so that the connecting slider 73 can slide in the opposite direction under the action of the compression spring 72 to pressurize the hydraulic oil into the middle driving chamber 11, and the top surface of the shrinking slider 812 is smoothed so that after the shrinking slider 812 shrinks, the main piston 4 will slide under the pressure of the hydraulic oil without causing great wear on the inner end surface of the shrinking slider 812 and the connecting slider 73, and at the same time avoid the main piston 4 from needing a greater sliding pressure, and at the same time can reduce the length of the connecting slider 73, and further reduce friction (relative sliding occurs between the reverse piston 6 and the main piston 4 under the action of the compression spring 72).

[0054] Working principle: When the hydraulic cylinder is started, the first stage of pressure increase process is carried out, and the hydraulic oil enters the drive chamber 11 from the liquid inlet channel 3. At this time, the hydraulic oil pressure in the drive chamber 11 increases, and the hydraulic oil presses the main piston 4 to the right. The main piston 4 slides to the right and drives the push ring 81 to slide to the right. The push ring 81 slides and pushes the reverse piston 6 to slide in the same direction. At this time, due to the rightward sliding of the reverse piston 6, the pressure in the annular chamber 51 decreases. When the main piston 4 slides, the pressure in the guide chamber 12 increases, so that the rubber valve 2 531 opens, and a part of the hydraulic oil in the guide chamber 12 is sucked into the annular chamber 51 through the guide channel 53, thereby helping the pressure of the guide chamber 12 to drop and the hydraulic pressure in the drive chamber 11 to increase rapidly, so that the main piston 4 slides to the right quickly, completing the first stage of pressure increase.

[0055] When the reverse piston 6 and the connecting slider 73 slide to the tail end of the active slide groove 71, the second stage of the pressure boosting process begins. At this time, the connecting slider 73 is supported by the active slide groove 71, and the contraction inclined surface 8121 of the contraction slider 812 is squeezed with the connecting slider 73, so that the contraction slider 812 is contracted. At this time, the push ring 81 and the connecting slider 73 are separated. At this time, the limiting effect on the reverse piston 6 disappears. Under the restoring force of the compression spring 72, the reverse piston 6 slides in the opposite direction to the main piston 4. At this time, the reverse piston 6 squeezes the hydraulic oil in the annular cavity 51, so that the rubber valve 1 521 and the rubber valve 2 531 are opened, so that the hydraulic oil is ejected through the boosting channel 52 and the guide channel 53, and the boosting channel The hydraulic oil sprayed from 52 guides the hydraulic oil entering the oil inlet channel 3 at the position of the drive chamber 11, causing it to flow toward the main piston 4, thereby reducing the pressure drop effect caused by the friction between the hydraulic oil in the drive chamber 11 and the inner wall of the main cylinder body 1. Since the guide channel 53 is close to the main piston 4, the hydraulic oil sprayed from the guide channel 53 directly generates thrust on the main piston 4. When the main piston 4 continues to slide away from the guide channel 53, the guide channel 53 changes from a pumping effect to a boosting effect similar to that of the boosting channel 52. The rubber valve 2 531 opens to the drive chamber 11, and since the guide channel 53 and the boosting channel 52 can pump the hydraulic oil from the guide chamber 12 to the drive chamber 11, the flow rate of the drive chamber 11 is increased, completing the second stage of pressure increase.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A composite hydraulic cylinder with a rapid pressure-increasing function, comprising a main cylinder body (1), a cylinder cover (2), an oil inlet passage (3) and a main piston (4), characterized in that: The invention also comprises a pressure-increasing chamber (5), a reverse piston (6), a connecting assembly (7) and a limiting assembly (8); the pressure-increasing chamber (5) is arranged on the inner wall of the main cylinder body (1); the reverse piston (6) is slidably installed in the pressure-increasing chamber (5); the connecting assembly (7) is connected to the reverse piston (6); the limiting assembly (8) is connected to the main piston (4); hydraulic oil enters the main cylinder body (1) from the oil inlet channel (3) to push the main piston (4) to slide, the sliding of the main piston (4) drives the limiting assembly (8) to slide, and the connecting assembly (7) is connected to the reverse piston (6); the limiting assembly (8) is connected to the main piston (4); the hydraulic oil enters the main cylinder body (1) from the oil inlet channel (3) to push the main piston (4) to slide, and the sliding of the main piston (4) drives the limiting assembly (8) to slide, and the connecting assembly (8) is connected to the reverse piston (6); the limiting assembly (8) is connected to the main piston (4); the hydraulic oil enters the main cylinder body (1) from the oil inlet channel (3) to push the main piston (4) to slide, and the sliding of the main piston (4) drives the limiting assembly (8) to slide, and the connecting assembly (7) is connected to the reverse piston (6); the limiting assembly (8) is connected to the main piston (4); ... The component (8) slides through the connecting component (7) to drive the reverse piston (6) to slide in the same direction as the main piston (4) to suck the hydraulic oil on the right side of the main piston (4) into the boost chamber (5); the connecting component (7) slides to the position of the limiting component (8); the limiting component (8) squeezes the connecting component (7) to separate the connecting component (7) and the reverse piston (6); after the connecting component (7) and the reverse piston (6) are separated, the reverse piston (6) slides in the opposite direction of the main piston (4) to press the hydraulic oil into the left side of the main piston (4).

2. A compound hydraulic cylinder with rapid pressure-increasing function according to claim 1, characterized in that: The main piston (4) is slidably mounted in the main cylinder body (1); the left side of the main piston (4) is a driving chamber (11), and the right side is a guide chamber (12); the boost chamber (5) comprises an annular chamber (51), a boost channel (52) and a guide channel (53); the annular chamber (51) is opened on the inner wall of the main cylinder body (1); the boost channel (52) is connected between the annular chamber (51) and the driving chamber (11); and the guide channel (53) is connected between the annular chamber (51) and the guide chamber (12).

3. A compound hydraulic cylinder with rapid pressure-increasing function according to claim 2, characterized in that: The boosting channels (52) are arranged in a circumferential array on the annular cavity (51); the boosting channels (52) are of a conical structure; and the axes of the boosting channels (52) are inclined to the axes of the main cylinder body (1) and face the direction of the flow guide cavity (12).

4. A compound hydraulic cylinder with rapid pressure-increasing function according to claim 3, characterized in that: The connecting assembly (7) comprises a movable slide groove (71), a compression spring (72) and a connecting slider (73); the movable slide groove (71) is arranged on the inner wall of the guide cavity (12); the compression spring (72) is connected between the reverse piston (6) and the tail end of the annular groove; and the connecting slider (73) is connected to the reverse piston (6).

5. The compound hydraulic cylinder with rapid pressure-increasing function according to claim 3, characterized in that: A rubber valve 1 (521) is provided at the position of the boosting channel (52); a rubber valve 2 (531) is provided at the position of the diversion channel (53); the structure of the diversion channel (53) is the same as that of the boosting channel (52); and when the reverse piston (6) moves in the reverse direction to the main piston (4), the diversion channel (53) is connected to the driving chamber (11).

6. A compound hydraulic cylinder with rapid pressure-increasing function according to claim 5, characterized in that: The rubber valve 1 (521) has a hard structure on the side facing the annular cavity (51) and cannot be opened in the direction of the annular cavity (51); the rubber valve 2 (531) has a soft structure and can be opened to both sides under pressure.

7. The compound hydraulic cylinder with rapid pressure-increasing function according to claim 1, characterized in that: The elastic modulus of the compression spring (72) satisfies that when the reverse piston (6) slides in the opposite direction to the main piston (4), the hydraulic oil pressure of the compression spring (72) is greater than the opening pressure of the rubber valve 1 (521) and the rubber valve 2 (531).

8. The compound hydraulic cylinder with rapid pressure-increasing function according to claim 7, characterized in that: The limit assembly (8) includes a push ring (81) and a sealing member (82); the push ring (81) includes a fixed ring (811), a retractable slider (812) and a connecting spring (813); the fixed ring (811) is connected to the main piston (4); the two retractable sliders (812) are slidably mounted on the fixed ring (811); the connecting spring (813) is connected between the two retractable sliders (812); and the sealing member (82) is slidably mounted in the movable slide groove (71).

9. The compound hydraulic cylinder with rapid pressure-increasing function according to claim 8, characterized in that: The sealing member (82) comprises a sealing groove (821), a sealing strip (822) and a sealing spring (823); the sealing groove (821) is provided at both ends of the movable groove (71); the sealing strip (822) is slidably installed in the sealing groove (821); and the sealing spring (823) is connected between the sealing strip (822) and the sealing spring (823).

10. The compound hydraulic cylinder with rapid pressure-increasing function according to claim 1, characterized in that: A contraction slope (8121) is provided on the top of the contraction slider (812); the elastic modulus of the connection spring (813) is such that no contraction deformation occurs when the reverse piston (6) slides in the same direction as the main piston (4).

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