An oil cylinder with multi-stage telescopic function

Abstract

The present invention relates to the field of oil cylinders and discloses an oil cylinder with a multi-stage telescopic function, comprising a first-stage telescopic oil cylinder and a second-stage telescopic oil cylinder, wherein the first-stage telescopic oil cylinder and the second-stage telescopic oil cylinder are both independently telescopically arranged; the first-stage telescopic oil cylinder and the second-stage telescopic oil cylinder are connected with a rodless cavity connecting pipe and a rod cavity connecting pipe respectively, which can greatly reduce the volume of the entire oil cylinder to achieve the purpose of saving space, and when maintenance is required, it is also easy to maintain and replace the components of the oil cylinder, thereby reducing maintenance costs and maintenance time; the stress-bearing area of the second-stage rod cavity of the second-stage telescopic oil cylinder is 1.25 times the stress-bearing area of the first-stage rod cavity of the first-stage telescopic oil cylinder, so the second-stage telescopic oil cylinder retracts first and the first-stage telescopic oil cylinder retracts later, thereby obtaining a very long working stroke, effectively improving the output force of the hydraulic oil cylinder, and thus enabling the oil cylinder to bear a larger load.

Description

Technical Field

[0001] The present invention relates to the field of oil cylinders, and in particular to an oil cylinder with multi-stage telescopic function. Background Art

[0002] Hydraulic cylinders are specialized components for various types of engineering machinery, coal mining machinery, special vehicles, and large machinery. In industrial production, they can be used in forging machinery, injection molding machines, machine tools, machining centers, robots, mining machinery, packaging machinery, etc. In mobile machinery, they can be used in engineering machinery, construction machinery, agricultural machinery, automobiles, etc.

[0003] Hydraulic cylinders are widely used today, with conventional cylinders primarily employed in industries such as construction machinery, metallurgy, injection molding, and pressurized machinery. Booster cylinders, also known as gas-liquid booster cylinders, as the name suggests, boost the hydraulic system's oil circuit pressure. They are an improved design that combines the advantages of both air and oil cylinders. Booster cylinders utilize pressure differentials to increase the pressure in the hydraulic system. This is achieved by increasing the volume of a portion of the oil in the cylinder, thereby compressing the remaining oil, thereby increasing system pressure. In some applications requiring the operation of large mechanical equipment, the output force generated by conventional single-stage hydraulic cylinders is insufficient, making the single-stage hydraulic cylinder structure unsuitable.

[0004] In response to the problem of low output force of hydraulic cylinders, the industry has conducted relevant research and design, such as a new type of two-stage telescopic cylinder. By installing a pressure relief valve in the piston, a boss is provided on the pressure relief valve. When the cylinder is extended to the bottom, the boss contacts the end face of the first-stage piston and the pressure cover, opening the pressure relief valve, and achieving oil pressure relief in the cylinder chambers A and B, thereby improving the stability of the cylinder movement; when the cylinder is extended, the pressure relief valve is closed, and chambers A and B cannot be connected. The movements between the first-stage piston rod and the second-stage piston rod are independent of each other, and the extension and retraction of the cylinder can be adjusted according to actual working conditions to adapt to various working conditions.

[0005] However, although the above-mentioned existing technology solves the problem of low output force of the hydraulic cylinder, since the two-stage hydraulic cylinder is integrated, the piston size and volume distribution ratio of each stage need to be strictly controlled. When there is a deviation or problem in any stage, it will affect the performance and service life of the entire cylinder, and increase repair and maintenance costs. Summary of the Invention

[0006] The present invention is to overcome the technical problems existing in the above-mentioned prior art and is an oil cylinder with a multi-stage telescopic function.

[0007] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0008] A multi-stage telescopic oil cylinder comprises a first-stage telescopic oil cylinder and a second-stage telescopic oil cylinder, wherein the first-stage telescopic oil cylinder and the second-stage telescopic oil cylinder are independently telescopically arranged;

[0009] The first-stage telescopic oil cylinder comprises a first-stage hydraulic cylinder body, a first-stage piston rod, a first-stage rodless chamber oil port and a first-stage rod chamber oil port. The first-stage piston rod is coaxially slidingly sealed and penetrates the first-stage hydraulic cylinder body cavity. The first-stage piston rod divides the first-stage hydraulic cylinder body into a first-stage rod chamber and a first-stage rodless chamber. A sequence valve is provided between the first-stage rod chamber and the first-stage rodless chamber.

[0010] The secondary telescopic oil cylinder includes a secondary hydraulic cylinder body, a secondary piston rod, a secondary rodless chamber oil port and a secondary rod chamber oil port. The secondary piston rod is coaxially slidingly sealed and penetrates the secondary hydraulic cylinder body cavity. The secondary piston rod divides the secondary hydraulic cylinder body into a secondary rod chamber and a secondary rodless chamber.

[0011] The force-bearing area of the secondary rod cavity is 1.25 times that of the primary rod cavity;

[0012] The first-level rodless chamber oil port is connected to the second-level rodless chamber oil port through a rodless chamber connecting pipe, and the first-level rod chamber oil port is connected to the second-level rod chamber oil port through a rod chamber connecting pipe.

[0013] Furthermore, the first-level telescopic oil cylinder is also provided with a first-level rodless chamber oil filling port and a first-level rod chamber oil filling port, the first-level rodless chamber oil filling port is connected to the first-level rodless chamber, and the first-level rod chamber oil filling port is connected to the first-level rod chamber.

[0014] Preferably, the hydraulic system is communicated with the first-level rodless chamber oil filling port and the first-level rod chamber oil filling port respectively.

[0015] Furthermore, the first-level rodless chamber oil port is connected to the first-level rodless chamber, and the first-level rod chamber oil port is connected to the first-level rod chamber; the second-level rodless chamber oil port is connected to the second-level rodless chamber, and the second-level rod chamber oil port is connected to the second-level rod chamber.

[0016] Furthermore, port A of the sequence valve is the oil inlet, and port B is the oil outlet. When the hydraulic oil enters the sequence valve from port A, causing the hydraulic oil pressure in the sequence valve to increase to a threshold, the sequence valve is turned on.

[0017] Preferably, when the hydraulic oil enters the sequence valve from port A and acts on the right end face of the valve core through the channel, as the hydraulic oil pressure continues to increase, the leftward thrust acting on the valve core also continues to increase, and the valve core moves until the pressure acting on the valve core overcomes the spring force to open port B.

[0018] Furthermore, the A port of the sequence valve is connected to the first-level rodless cavity, and the B port of the sequence valve is connected to the second-level rodless cavity through the rodless cavity connecting pipe; the B port of the sequence valve is also connected to the rodless cavity connecting pipe through a pipeline.

[0019] Preferably, sealing rings are further provided at both ends of the pipeline, and the two ends of the pipeline are connected to the B port of the sequence valve and the rodless cavity connecting pipe through threads.

[0020] Furthermore, a through hole is provided in the middle of the first-level piston rod, and the first-level rodless chamber oil filling port is connected to the first-level rodless chamber through the middle through hole of the first-level piston rod; a through hole is also provided in the middle of the second-level piston rod, and the second-level rodless chamber oil port is connected to the second-level rodless chamber through the middle through hole of the second-level piston rod.

[0021] Furthermore, a one-way valve is provided between the secondary rod chamber and the secondary rodless chamber.

[0022] Furthermore, the sequence valve is arranged at the end of the first-stage telescopic oil cylinder; the end of the first-stage telescopic oil cylinder is also connected to a screw for sealing the sequence valve in the first-stage telescopic oil cylinder.

[0023] Furthermore, the first-stage telescopic oil cylinder is also provided with two sealing valve ports, which are respectively connected to the A port and the B port of the sequence valve.

[0024] Furthermore, a pulley is connected to the end of the secondary telescopic cylinder.

[0025] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0026] ① Setting up a split-connected multi-stage telescopic cylinder can ensure that it can bear a large load while reducing maintenance costs and time;

[0027] The present invention connects the first-stage telescopic oil cylinder and the second-stage telescopic oil cylinder with a rodless cavity connecting pipe and a rod cavity connecting pipe respectively, which can greatly reduce the volume of the entire oil cylinder to achieve the purpose of saving space. When maintenance is needed, the components of the oil cylinder can be easily maintained and replaced, thereby reducing maintenance costs and maintenance time.

[0028] ② A sequence valve is installed in the first-stage telescopic cylinder, so that the cylinder can bear a larger load;

[0029] The present invention connects the A port of the sequence valve with the first-stage rodless cavity, and connects the B port of the sequence valve with the second-stage rodless cavity through the rodless cavity connecting pipe;

[0030] When the hydraulic system supplies pressure oil to the oil filling port of the first-stage rodless chamber and draws pressure oil from the oil filling port of the first-stage rod chamber, the hydraulic oil flows into the first-stage rodless chamber through the middle through-hole of the first-stage piston rod, further pushing the first-stage piston rod of the first-stage telescopic cylinder to extend;

[0031] At this time, hydraulic oil enters the sequence valve from port A and acts on the right end face of the valve core through the channel. As the hydraulic oil pressure continues to increase, the leftward thrust acting on the valve core also continues to increase, and the valve core moves; when the first-stage piston rod is fully extended, the pressure acting on the valve core overcomes the spring force to open port B, connecting ports A and B of the sequence valve;

[0032] At this time, the hydraulic oil enters the secondary rodless cavity oil port of the secondary telescopic oil cylinder from the B port of the sequence valve through the rodless cavity connecting pipe, and the hydraulic oil flows into the secondary rodless cavity through the middle through-hole of the secondary piston rod, further pushing the secondary piston rod of the secondary telescopic oil cylinder to extend;

[0033] When the hydraulic system draws pressure oil from the first rodless chamber oil filling port and supplies pressure oil to the first rod chamber oil filling port, the sequence valve is in the high-pressure conduction state, and the hydraulic oil flows through the first rod chamber and the rod chamber connecting pipe into the second rod chamber of the second telescopic cylinder, pushing the second piston rod of the second telescopic cylinder to retract;

[0034] When the secondary piston rod is fully retracted, the spring force of the sequence valve closes port B, and ports A and B of the sequence valve are disconnected;

[0035] At this time, the hydraulic oil in the first-stage rodless cavity flows into the hydraulic system, pushing the first-stage piston rod of the first-stage telescopic cylinder to retract;

[0036] Since the force-bearing area of the secondary rod cavity of the secondary telescopic cylinder is 1.25 times the force-bearing area of the primary rod cavity of the primary telescopic cylinder, the secondary telescopic cylinder retracts first and the primary telescopic cylinder retracts later, thereby obtaining a very long working stroke and effectively improving the output force of the hydraulic cylinder, so that the cylinder can bear a larger load.

[0037] ③ Connect the end of the second-stage telescopic cylinder of the multi-stage telescopic cylinder to the pulley, so as to stably connect the cylinder to the device;

[0038] The present invention connects the end of the second-stage telescopic cylinder of the multi-stage telescopic cylinder to the pulley. When the cylinder needs to be installed on the device, it can be simply slidably connected to the device through the pulley, and the load of the bearing cylinder can be shared on the pulley, thereby providing a greater load-bearing capacity to adapt to different work needs and scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 This is a schematic diagram of the structure of a multi-stage telescopic oil cylinder with split connections;

[0041] Figure 2 This is a structural diagram of the first-level telescopic cylinder;

[0042] Figure 3 It is a structural diagram of the secondary telescopic cylinder;

[0043] Figure 4 This is the principle diagram of the sequence valve;

[0044] Figure 5 This is a structural diagram of Example 3.

[0045] Among them, 1. First-level telescopic cylinder; 101. First-level hydraulic cylinder body; 102. First-level piston rod; 103. First-level rodless chamber oil port; 104. First-level rod chamber oil port; 105. First-level rod chamber; 106. First-level rodless chamber; 107. First-level rodless chamber oil filling port; 108. First-level rod chamber oil filling port; 2. Second-level telescopic cylinder; 201. Second-level hydraulic cylinder body; 202. Second-level piston rod; 203. Second-level rodless chamber oil port; 204. Second-level rod chamber oil port; 205. Second-level rod chamber; 206. Second-level rodless chamber; 3. Sequence valve; 4. Rodless chamber connecting pipe; 5. Rod chamber connecting pipe; 6. Pipeline; 7. Screw; 8. Pulley; 9. Hydraulic pressure gauge 1; 10. Hydraulic pressure gauge 2 DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the described embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] Unless otherwise defined, the technical or scientific terms used in this application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0048] Example 1

[0049] like Figure 1-4 As shown, this embodiment discloses a split-connected multi-stage telescopic oil cylinder, comprising a first-stage telescopic oil cylinder 1 and a second-stage telescopic oil cylinder 2, both of which are independently telescopically arranged;

[0050] The first-stage telescopic oil cylinder 1 includes a first-stage hydraulic cylinder body 101, a first-stage piston rod 102, a first-stage rodless chamber oil port 103, and a first-stage rod chamber oil port 104. The first-stage piston rod 102 is coaxially slidingly sealed and penetrates the first-stage hydraulic cylinder body 101 cavity. The first-stage piston rod 102 divides the first-stage hydraulic cylinder body 101 into a first-stage rod chamber 105 and a first-stage rodless chamber 106. A sequence valve 3 is provided between the first-stage rod chamber 105 and the first-stage rodless chamber 106.

[0051] The secondary telescopic oil cylinder 2 includes a secondary hydraulic cylinder body 201, a secondary piston rod 202, a secondary rodless chamber oil port 203, and a secondary rod chamber oil port 204. The secondary piston rod 202 is coaxially slidingly sealed and penetrates the cavity of the secondary hydraulic cylinder body 201. The secondary piston rod 202 divides the secondary hydraulic cylinder body 201 into a secondary rod chamber 205 and a secondary rodless chamber 206.

[0052] The force-bearing area of the secondary rod cavity 205 is 1.25 times that of the primary rod cavity 105;

[0053] The first-stage rodless chamber oil port 103 is connected to the second-stage rodless chamber oil port 203 through the rodless chamber connecting pipe 4 , and the first-stage rod chamber oil port 104 is connected to the second-stage rod chamber oil port 204 through the rod chamber connecting pipe 5 .

[0054] Therefore, in the implementation of the present scheme, the first-level telescopic cylinder 1 and the second-level telescopic cylinder 2 are connected with the rodless cavity connecting pipe 4 and the rod cavity connecting pipe 5 respectively, which can greatly reduce the volume of the entire cylinder to achieve the purpose of saving space. When maintenance is needed, the components of the cylinder can also be easily maintained and replaced, thereby reducing maintenance costs and maintenance time.

[0055] As a specific embodiment, the first-stage telescopic oil cylinder 1 is further provided with a first-stage rodless chamber oil filling port 107 and a first-stage rod chamber oil filling port 108. The first-stage rodless chamber oil filling port 107 is connected to the first-stage rodless chamber 106, and the first-stage rod chamber oil filling port 108 is connected to the first-stage rod chamber 105.

[0056] A through hole is also provided in the middle of the primary piston rod 102, and the primary rodless cavity oil filling port 107 is connected to the primary rodless cavity 106 through the middle through hole of the primary piston rod 102; a through hole is also provided in the middle of the secondary piston rod 202, and the secondary rodless cavity oil port 203 is connected to the secondary rodless cavity 206 through the middle through hole of the secondary piston rod 202;

[0057] The first-stage telescopic oil cylinder 1 is also provided with two sealing valve ports, which are respectively connected to the A port and the B port of the sequence valve 3;

[0058] The first-stage rodless chamber oil port is connected to the first-stage rodless chamber, and the first-stage rod chamber oil port is connected to the first-stage rod chamber; the second-stage rodless chamber oil port 203 is connected to the second-stage rodless chamber 206, and the second-stage rod chamber oil port 204 is connected to the second-stage rod chamber 205;

[0059] Port A of the sequence valve 3 is the oil inlet, and port B is the oil outlet. When the hydraulic oil enters the sequence valve 3 from port A, causing the hydraulic oil pressure in the sequence valve 3 to increase to a threshold value, the sequence valve 3 is turned on; port A of the sequence valve 3 is connected to the first-level rodless cavity 106, and port B of the sequence valve 3 is connected to the second-level rodless cavity 206 through the rodless cavity connecting pipe 4; port B of the sequence valve 3 is also connected to the rodless cavity connecting pipe 4 through the pipeline 6.

[0060] During operation, the hydraulic system supplies pressurized oil to the first-stage rodless chamber oil filling port 107 and draws pressurized oil from the first-stage rod chamber oil filling port 108; the hydraulic oil flows into the first-stage rodless chamber 105 through the middle through-hole of the first-stage piston rod 102, further pushing the first-stage piston rod 102 of the first-stage telescopic cylinder 1 to extend;

[0061] At this time, hydraulic oil enters the sequence valve 3 from port A and acts on the right end face of the valve core through the channel. As the hydraulic oil pressure continues to increase, the leftward thrust acting on the valve core also continues to increase, and the valve core moves; when the first-stage piston rod 102 is fully extended, the pressure acting on the valve core overcomes the spring force to open port B, connecting ports A and B of the sequence valve 3;

[0062] At this time, the hydraulic oil enters the secondary rodless chamber oil port 203 of the secondary telescopic oil cylinder 2 from the B port of the sequence valve 3 through the rodless chamber connecting pipe 4, and the hydraulic oil flows into the secondary rodless chamber 206 through the middle through-hole of the secondary piston rod 202, further pushing the secondary piston rod 202 of the secondary telescopic oil cylinder 2 to extend;

[0063] When the hydraulic system draws pressure oil from the first rodless chamber oil filling port 107 and supplies pressure oil to the first rod chamber oil filling port 108, the sequence valve 3 is in the high-pressure conduction state, and the hydraulic oil flows through the first rod chamber 105 and the rod chamber connecting pipe 5 into the second rod chamber 205 of the second telescopic cylinder 2, pushing the second piston rod 202 of the second telescopic cylinder 2 to retract;

[0064] When the secondary piston rod 202 is fully retracted, the spring force of the sequence valve 3 closes the B port, and the A port and the B port of the sequence valve 3 are disconnected;

[0065] At this time, the hydraulic oil in the first-stage rodless chamber 106 flows into the hydraulic system, pushing the first-stage piston rod 102 of the first-stage telescopic cylinder 1 to retract;

[0066] Since the force-bearing area of the secondary rod chamber 205 of the secondary telescopic cylinder 2 is 1.25 times the force-bearing area of the primary rod chamber 105 of the primary telescopic cylinder 1, the secondary telescopic cylinder 2 retracts first and the primary telescopic cylinder 1 retracts later, thereby obtaining a very long working stroke and effectively improving the output force of the hydraulic cylinder, so that the cylinder can bear a larger load.

[0067] As a specific embodiment, a one-way valve is provided between the secondary rod chamber 205 and the secondary rodless chamber 206 to ensure that the hydraulic oil flows unimpeded from the inlet end to the outlet end of the one-way valve. When the hydraulic oil flows from the outlet end to the inlet end of the one-way valve, the flow rate of the hydraulic oil decreases, further ensuring that the booster cylinder can achieve a higher output force under the same hydraulic oil pressure.

[0068] The sequence valve 3 is arranged at the end of the first-stage telescopic oil cylinder 1; the end of the first-stage telescopic oil cylinder 1 is also connected to a screw 7 for sealing the sequence valve 3 in the first-stage telescopic oil cylinder 1;

[0069] When the sequence valve 3 is damaged and needs maintenance or replacement, the screw rod 7 can be removed from the end of the first-stage telescopic oil cylinder 1 to easily maintain and replace the sequence valve 3, thereby reducing maintenance costs and maintenance time.

[0070] Example 2

[0071] like Figure 1-4 As shown, this embodiment discloses a split-connected multi-stage telescopic oil cylinder, comprising a first-stage telescopic oil cylinder 1 and a second-stage telescopic oil cylinder 2, both of which are independently telescopically arranged;

[0072] The first-stage telescopic oil cylinder 1 includes a first-stage hydraulic cylinder body 101, a first-stage piston rod 102, a first-stage rodless chamber oil port 103, and a first-stage rod chamber oil port 104. The first-stage piston rod 102 is coaxially slidingly sealed and penetrates the first-stage hydraulic cylinder body 101 cavity. The first-stage piston rod 102 divides the first-stage hydraulic cylinder body 101 into a first-stage rod chamber 105 and a first-stage rodless chamber 106. A sequence valve 3 is provided between the first-stage rod chamber 105 and the first-stage rodless chamber 106.

[0073] The secondary telescopic oil cylinder 2 includes a secondary hydraulic cylinder body 201, a secondary piston rod 202, a secondary rodless chamber oil port 203, and a secondary rod chamber oil port 204. The secondary piston rod 202 is coaxially slidingly sealed and penetrates the cavity of the secondary hydraulic cylinder body 201. The secondary piston rod 202 divides the secondary hydraulic cylinder body 201 into a secondary rod chamber 205 and a secondary rodless chamber 206.

[0074] The force-bearing area of the secondary rod cavity 205 is 1.25 times that of the primary rod cavity 105;

[0075] The first-stage rodless chamber oil port 103 is connected to the second-stage rodless chamber oil port 203 through the rodless chamber connecting pipe 4 , and the first-stage rod chamber oil port 104 is connected to the second-stage rod chamber oil port 204 through the rod chamber connecting pipe 5 .

[0076] As a specific implementation, a pulley 8 is connected to the end of the secondary telescopic cylinder 2 .

[0077] Therefore, in the implementation mode of the present scheme, by connecting the end of the second-stage telescopic cylinder 2 of the multi-stage telescopic cylinder to the pulley 8, when the cylinder needs to be installed with the required device, the pulley 8 can be simply slidably connected to the device, and the load of the bearing cylinder can be shared on the pulley 8, thereby providing a greater load-bearing capacity to adapt to different work needs and scenarios.

[0078] Example 3

[0079] like Figure 1-5 As shown, this embodiment discloses a split-connected multi-stage telescopic oil cylinder, comprising a first-stage telescopic oil cylinder 1 and a second-stage telescopic oil cylinder 2, both of which are independently telescopically arranged;

[0080] The first-stage telescopic oil cylinder 1 includes a first-stage hydraulic cylinder body 101, a first-stage piston rod 102, a first-stage rodless chamber oil port 103, and a first-stage rod chamber oil port 104. The first-stage piston rod 102 is coaxially slidingly sealed and penetrates the first-stage hydraulic cylinder body 101 cavity. The first-stage piston rod 102 divides the first-stage hydraulic cylinder body 101 into a first-stage rod chamber 105 and a first-stage rodless chamber 106. A sequence valve 3 is provided between the first-stage rod chamber 105 and the first-stage rodless chamber 106.

[0081] The secondary telescopic oil cylinder 2 includes a secondary hydraulic cylinder body 201, a secondary piston rod 202, a secondary rodless chamber oil port 203, and a secondary rod chamber oil port 204. The secondary piston rod 202 is coaxially slidingly sealed and penetrates the cavity of the secondary hydraulic cylinder body 201. The secondary piston rod 202 divides the secondary hydraulic cylinder body 201 into a secondary rod chamber 205 and a secondary rodless chamber 206.

[0082] The force-bearing area of the secondary rod cavity 205 is 1.25 times that of the primary rod cavity 105;

[0083] The first-stage rodless chamber oil port 103 is connected to the second-stage rodless chamber oil port 203 through the rodless chamber connecting pipe 4 , and the first-stage rod chamber oil port 104 is connected to the second-stage rod chamber oil port 204 through the rod chamber connecting pipe 5 .

[0084] If necessary, a hydraulic pressure gauge 1 9 is provided at the sealing valve port connected to the sequence valve 3A port on the first-stage telescopic oil cylinder 1, and a hydraulic pressure gauge 2 10 is provided at the sealing valve port connected to the sequence valve 3B port, so as to monitor the pressure at the A port and the B port of the sequence valve 3 in the first-stage telescopic oil cylinder 1;

[0085] Since in the hydraulic system, the hydraulic oil transmits force by flowing between the first-stage telescopic cylinder 1 and the second-stage telescopic cylinder 2, the pressure of the first-stage telescopic cylinder 1 and the second-stage telescopic cylinder 2 has a vital impact on the operation of the hydraulic system;

[0086] Hydraulic pressure gauge 1-9 and hydraulic pressure gauge 2-10 can help engineers monitor the pressure changes of the hydraulic system so that timely adjustments can be made, effectively ensuring the stability and safety of the cylinder. In addition, hydraulic pressure gauge 1-9 and hydraulic pressure gauge 2-10 can also help engineers regularly perform effective maintenance and inspections on the booster cylinder to ensure the normal operation of the system.

[0087] When necessary, the hydraulic pressure gauge 1 9 and the hydraulic pressure gauge 2 10 can be connected to the sealing valve port of the first-level telescopic oil cylinder 1 through threads; when the hydraulic pressure gauge is damaged and needs to be replaced, the hydraulic pressure gauge can be quickly replaced by rotating the threads.

[0088] How it works

[0089] By connecting the first-stage telescopic cylinder 1 and the second-stage telescopic cylinder 2 with the rodless cavity connecting pipe 4 and the rod cavity connecting pipe 5 respectively, the volume of the entire cylinder can be greatly reduced to achieve the purpose of saving space. When maintenance is needed, the components of the cylinder can also be easily maintained and replaced, thereby reducing maintenance costs and maintenance time.

[0090] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A cylinder with multi-stage telescopic function, characterized in that: It comprises a first-stage telescopic oil cylinder (1) and a second-stage telescopic oil cylinder (2), wherein the first-stage telescopic oil cylinder (1) and the second-stage telescopic oil cylinder (2) are both independently telescopically arranged; The first-stage telescopic oil cylinder (1) comprises a first-stage hydraulic cylinder body (101), a first-stage piston rod (102), a first-stage rodless chamber oil port (103), and a first-stage rod chamber oil port (104); the first-stage piston rod (102) is coaxially slidingly sealed and penetrates the first-stage hydraulic cylinder body (101) cavity; the first-stage piston rod (102) divides the first-stage hydraulic cylinder body (101) into a first-stage rod chamber (105) and a first-stage rodless chamber (106); a sequence valve (3) is provided between the first-stage rod chamber (105) and the first-stage rodless chamber (106); The secondary telescopic oil cylinder (2) comprises a secondary hydraulic cylinder body (201), a secondary piston rod (202), a secondary rodless chamber oil port (203), and a secondary rod chamber oil port (204); the secondary piston rod (202) is coaxially slidingly sealed and penetrates the cavity of the secondary hydraulic cylinder body (201); the secondary piston rod (202) divides the secondary hydraulic cylinder body (201) into a secondary rod chamber (205) and a secondary rodless chamber (206); The force-bearing area of the secondary rod cavity (205) is 1.25 times that of the primary rod cavity (105); The first-level rodless chamber oil port (103) is connected to the second-level rodless chamber oil port (203) via a rodless chamber connecting pipe (4), and the first-level rod chamber oil port (104) is connected to the second-level rod chamber oil port (204) via a rod chamber connecting pipe (5); The first-stage telescopic oil cylinder (1) is further provided with a first-stage rodless chamber oil filling port (107) and a first-stage rod chamber oil filling port (108), wherein the first-stage rodless chamber oil filling port (107) is connected to the first-stage rodless chamber (106), and the first-stage rod chamber oil filling port (108) is connected to the first-stage rod chamber (105); The first-stage rodless chamber oil port is connected to the first-stage rodless chamber, and the first-stage rod chamber oil port is connected to the first-stage rod chamber; the second-stage rodless chamber oil port (203) is connected to the second-stage rodless chamber (206), and the second-stage rod chamber oil port (204) is connected to the second-stage rod chamber (205); A through hole is also provided in the middle of the first piston rod (102), and the first rodless cavity oil filling port (107) is communicated with the first rodless cavity (106) through the middle through hole of the first piston rod (102); a through hole is also provided in the middle of the second piston rod (202), and the second rodless cavity oil port (203) is communicated with the second rodless cavity (206) through the middle through hole of the second piston rod (202); Port A of the sequence valve (3) is an oil inlet, and port B is an oil outlet. When hydraulic oil enters the sequence valve (3) from port A, causing the hydraulic oil pressure in the sequence valve (3) to increase to a threshold value, the sequence valve (3) is turned on. The A port of the sequence valve (3) is connected to the first rodless cavity (106), and the B port of the sequence valve (3) is connected to the second rodless cavity (206) via the rodless cavity connecting pipe (4); the B port of the sequence valve (3) is also connected to the rodless cavity connecting pipe (4) via the pipe (6); A one-way valve is provided between the secondary rod chamber (205) and the secondary rodless chamber (206).

2. The oil cylinder with multi-stage telescopic function according to claim 1, characterized in that: The sequence valve (3) is arranged at the end of the first-stage telescopic oil cylinder (1); the end of the first-stage telescopic oil cylinder (1) is also connected to a screw (7) for sealing the sequence valve (3) in the first-stage telescopic oil cylinder (1).

3. The oil cylinder with multi-stage telescopic function according to claim 1, characterized in that: The first-stage telescopic oil cylinder (1) is further provided with two sealing valve ports, which are respectively connected to port A and port B of the sequence valve (3).

4. The oil cylinder with multi-stage telescopic function according to claim 1, characterized in that: The end of the secondary telescopic oil cylinder (2) is connected to a pulley (8).

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