Oil cylinder explosion-proof device with simple structure

Abstract

The utility model discloses an oil cylinder explosion-proof device with a simple structure, and particularly relates to the technical field of oil cylinders. A mounting cavity extending into the cylinder bottom is formed in the top of the cylinder bottom, the outer wall of the sliding valve slides on the inner wall of the mounting cavity, the oil pipe connector is detachably mounted at the top of the mounting cavity, and the end, penetrating into the mounting cavity, of the oil pipe connector is fixedly connected with the top of the sliding valve through a spring. An upper oil duct communicated with the middle of the mounting cavity and a lower oil duct communicated with the bottom of the mounting cavity are formed in the side surface of the cylinder bottom; a flow descending mechanism is arranged on the side portion of the sliding valve. By arranging the sliding valve, when the oil cylinder works normally, oil passes through the upper oil channel, when the pipe explosion condition occurs, pressure oil in the oil cylinder pushes the sliding valve to the oil pipe connector, and when the sliding valve is combined with the oil pipe connector, hydraulic oil is discharged from the throttling hole, the flow is reduced, and the safety of a hydraulic system is ensured; the explosion-proof effect is achieved through fewer parts, the production cost of the oil cylinder is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, and more specifically, to an oil cylinder explosion-proof device with a simple structure. Background Art

[0002] It is known that the explosion-proof valve is an important component in the oil cylinder of the lifting equipment. Its main function is to prevent the lifting equipment from uncontrollably falling after lifting the goods when the oil pipe suddenly bursts and releases pressure. This component thus plays a role in preventing safety accidents.

[0003] Among them, the existing explosion-proof valves mostly use valve bodies with different inner diameter cavity sections. The valve body is difficult to manufacture, the machining accuracy is not easy to guarantee, and it is not easy to assemble internal parts. At the same time, the spring that controls the movement of the valve core is also prone to jamming. In addition, when a conventional one-way valve is used as a safety valve, it can only cut off the oil path connected to the cylinder when the oil pipe suddenly bursts, and the cylinder stops moving immediately. The lifting equipment may lift the goods in mid-air and cannot be easily unloaded, so it is necessary to optimize the design of the existing cut-off valve in a targeted manner.

[0004] Among them, Chinese patent application No. 202222053613.4 discloses a built-in explosion-proof valve, which "is supported by a conical tower spring through a support seat in the inner cavity of a closed valve body. When the hydraulic system is working normally, the support seat is pushed open by the spring and keeps the valve body's liquid cavity section connected to the liquid hole. When a pipe burst occurs and the pressure is suddenly released, the oil pressure in the liquid cavity section decreases, and the support seat is pushed by the pressure oil in the cylinder to move to the side of the second step until the support seat fits with the second step, effectively ensuring safety"; however, the device is an integrated explosion-proof valve, and the moving parts inside it include at least a recess, a spring and a support seat. Therefore, a simple-structured oil cylinder explosion-proof device is proposed as a further improvement, so as to achieve the explosion-proof function with fewer parts, thereby reducing the production cost of the oil cylinder and improving production efficiency. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the utility model provides a cylinder explosion-proof device with a simple structure to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above purpose, the utility model provides the following technical solutions: a simple structure oil cylinder explosion-proof device, the device comprises: a cylinder bottom, a slide valve, a spring and an oil pipe joint;

[0007] The top of the cylinder bottom is provided with an installation cavity extending to the inside of the cylinder bottom, the outer wall of the sliding valve slides on the inner wall of the installation cavity, the oil pipe joint is detachably installed on the top of the installation cavity, one end of the oil pipe joint inserted into the installation cavity is fixedly connected to the top of the sliding valve through a spring, and the side of the cylinder bottom is provided with an upper oil channel connected to the middle of the installation cavity and a lower oil channel connected to the bottom of the installation cavity; the side of the sliding valve is provided with a flow reduction mechanism.

[0008] Further, the flow reduction mechanism comprises: an annular groove and a throttling hole;

[0009] The annular groove is formed on the side of the middle part of the slide valve, the throttling hole is formed in the annular groove, the end surface of the slide valve facing the oil pipe joint is formed with a through groove, and the annular groove is connected with the through groove through the throttling hole.

[0010] Furthermore, at least two throttling holes are formed on the annular groove, and the throttling holes are evenly distributed on the annular groove.

[0011] Furthermore, a limiting step groove is provided at the bottom of the installation cavity, and the bottom of the installation cavity is connected with the lower oil channel through the limiting step groove.

[0012] Furthermore, the inner diameter of the lower oil channel and the inner diameter of the limiting step groove are both smaller than the outer diameter of the sliding valve, and the outer wall of the sliding valve is tightly fitted with the inner wall of the installation cavity.

[0013] Furthermore, the end of the sliding valve away from the oil pipe joint is configured to be in a truncated cone shape, and the end of the sliding valve away from the oil pipe joint is provided with an inclined groove for maintaining pressure balance at the bottom of the sliding valve.

[0014] Furthermore, two ends of the spring are fixedly mounted on the inner wall of the oil pipe joint and the inner wall of the through groove respectively.

[0015] Technical effects and advantages of the utility model:

[0016] Compared with the prior art, by setting a sliding valve, the oil can pass through the upper oil channel when the oil cylinder is working normally. When a pipe bursts in the hydraulic system, the pressure oil in the oil cylinder will push the sliding valve to the oil pipe joint. When the sliding valve is combined with the oil pipe joint, the hydraulic oil will be discharged from the throttle hole, thereby reducing the flow rate and ensuring the safety of the hydraulic system. Since the only moving parts inside the cylinder bottom are the sliding valve and the spring, the explosion-proof effect is achieved with fewer parts. Since the structure of the overall oil cylinder explosion-proof device is simple, the production cost of the oil cylinder is reduced and the production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional schematic diagram of the cylinder bottom of the utility model.

[0018] Figure 2It is a cross-sectional schematic diagram of the slide valve and the oil pipe joint of the utility model.

[0019] Figure 3 It is a structural schematic diagram of the slide valve and flow reduction mechanism of the utility model.

[0020] Figure 4 It is a cross-sectional schematic diagram of the cylinder bottom, slide valve and oil pipe joint of the utility model.

[0021] The accompanying drawings are marked as follows:

[0022] 1. Cylinder bottom; 11. Installation cavity; 111. Limiting step groove; 12. Upper oil channel; 13. Lower oil channel;

[0023] 2. Sliding valve; 21. Through slot; 22. Inclined slot;

[0024] 3. Spring;

[0025] 4. Oil pipe joint;

[0026] 5. Flow reducing mechanism; 51. Annular groove; 52. Throttle hole. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] As attached Figure 1-4 The oil cylinder explosion-proof device shown has a simple structure, and the device comprises: a cylinder bottom 1, a slide valve 2, a spring 3 and an oil pipe joint 4;

[0029] The top of the cylinder bottom 1 is provided with a mounting cavity 11 extending to the inside of the cylinder bottom 1, and the outer wall of the slide valve 2 slides on the inner wall of the mounting cavity 11;

[0030] The slide valve 2 is slidably matched with the inner wall of the installation cavity 11, and the slide valve 2 and the oil pipe joint 4 are supported by the spring 3;

[0031] The oil pipe joint 4 is detachably mounted on the top of the installation cavity 11, and one end of the oil pipe joint 4 inserted into the installation cavity 11 is fixedly connected to the top of the slide valve 2 through the spring 3.

[0032] The oil pipe joint 4 can be installed in the installation cavity 11 of the cylinder bottom 1 by means of threads, and the inner diameter of the installation cavity 11 of the cylinder bottom 1 is the same as the outer diameter of the slide valve 2. Therefore, the slide valve 2 is easy to install, and the occurrence of the spring 3 or the slide valve 2 getting stuck during the working process is effectively reduced;

[0033] An upper oil passage 12 communicating with the middle of the installation cavity 11 and a lower oil passage 13 communicating with the bottom of the installation cavity 11 are provided on the side of the cylinder bottom 1 ; a flow reduction mechanism 5 is provided on the side of the slide valve 2 .

[0034] Among them, since the movable parts inside the cylinder bottom 1 are only the slide valve 2 and the spring 3, the explosion-proof effect is achieved with fewer parts. Since the structure of the overall oil cylinder explosion-proof device is simple, the production cost of the oil cylinder is reduced and the production efficiency is improved.

[0035] In a preferred embodiment, as shown in the attached Figure 1-4 As shown, the flow reduction mechanism 5 includes: an annular groove 51 and a throttling hole 52;

[0036] An annular groove 51 is formed on the side of the middle of the slide valve 2 , a throttle hole 52 is formed in the annular groove 51 , a through groove 21 is formed on the end surface of the slide valve 2 facing the oil pipe joint 4 , and the annular groove 51 is connected to the through groove 21 through the throttle hole 52 .

[0037] The annular groove 51 and the throttle hole 52 are both provided on the slide valve 2, thereby saving components and simplifying the structure of the overall oil cylinder explosion-proof device, thereby reducing the oil cylinder production cost and improving production efficiency;

[0038] In a preferred embodiment, as shown in the attached Figure 1-4 As shown, at least two throttling holes 52 are formed on the annular groove 51 , and the throttling holes 52 are evenly distributed on the annular groove 51 .

[0039] Embodiment of slide valve 2: An annular groove 51 is provided on the outer wall of slide valve 2, and two throttling holes 52 are provided in the annular groove 51;

[0040] In a preferred embodiment, as shown in the attached Figure 1-4 As shown, a limiting step groove 111 is provided at the bottom of the installation cavity 11 , and the bottom of the installation cavity 11 is connected to the lower oil channel 13 through the limiting step groove 111 .

[0041] The bottom of the installation cavity 11 forms a limit for the slide valve 2 to prevent the slide valve 2 from entering the limit step groove 111, and the oil pipe joint 4 installed on the top of the installation cavity 11 limits the maximum displacement of the slide valve 2 to prevent the slide valve 2 from coming out;

[0042] In a preferred embodiment, as shown in the attached Figure 1-4As shown, the inner diameter of the lower oil passage 13 and the inner diameter of the limit step groove 111 are both smaller than the outer diameter of the slide valve 2, and the outer wall of the slide valve 2 is tightly fitted with the inner wall of the installation cavity 11; so that when the slide valve 2 is tightly attached to the installation cavity 11 of the cylinder bottom 1, the flow of oil in the lower oil passage 13 can be blocked, because the slide valve 2 divides the installation cavity 11 of the cylinder bottom 1 into an upper and lower cavity; when the oil cylinder works normally, the oil flows back to the oil tank through the upper oil passage 12; when a pipe burst occurs in the hydraulic system, the oil pressure in the upper oil passage 12 is instantly reduced, and the hydraulic oil in the oil cylinder passes through the lower oil passage 13 to push the slide valve 2 toward the oil pipe joint 4, so that the slide valve 2 is combined with the oil pipe joint 4, and only the oil is allowed to flow out through the throttle hole 52 at a smaller flow rate, effectively preventing a large amount of hydraulic oil from being discharged, thereby ensuring the safety of the hydraulic system.

[0043] In a preferred embodiment, as shown in the attached Figure 1-4 As shown, the end of the slide valve 2 away from the oil pipe joint 4 is shaped as a truncated cone, and the end of the slide valve 2 away from the oil pipe joint 4 is provided with an inclined groove 22 for maintaining the pressure balance at the bottom of the slide valve 2 .

[0044] Among them, the inclined groove 22 designed on the bottom of the slide valve 2 is as follows Figure 3 As shown;

[0045] In a preferred embodiment, as shown in the attached Figure 1-4 As shown, two ends of the spring 3 are fixedly mounted on the inner wall of the oil pipe joint 4 and the inner wall of the through groove 21 respectively.

[0046] Working principle of the utility model: when the oil cylinder works normally, the spring 3 separates the slide valve 2 from the oil pipe joint 4, and the oil flows from the oil pipe joint 4 through the upper oil channel 12 back to the oil tank;

[0047] When a pipe burst occurs in the hydraulic system, the oil pressure in the upper oil passage 12 drops instantly, and the hydraulic oil in the cylinder pushes the slide valve 2 toward the oil pipe joint 4 through the lower oil passage 13. Then, when the slide valve 2 is combined with the oil pipe joint 4, the oil enters the through groove 22 of the slide valve 2 from the oil pipe joint 4, and then enters the upper oil passage 12 through the throttle hole 52 and flows back to the oil tank. Since the oil is only allowed to flow out through the throttle hole 52 at a relatively small flow rate, a large amount of hydraulic oil is effectively prevented from being discharged, thereby ensuring the safety of the hydraulic system.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A simple structure oil cylinder explosion-proof device, characterized in that: The device comprises: a cylinder bottom (1), a slide valve (2), a spring (3) and an oil pipe joint (4); The top of the cylinder bottom (1) is provided with a mounting cavity (11) extending into the interior of the cylinder bottom (1); the outer wall of the slide valve (2) slides on the inner wall of the mounting cavity (11); the oil pipe joint (4) is detachably mounted on the top of the mounting cavity (11); one end of the oil pipe joint (4) inserted into the mounting cavity (11) is fixedly connected to the top of the slide valve (2) via a spring (3); an upper oil passage (12) communicating with the middle of the mounting cavity (11) and a lower oil passage (13) communicating with the bottom of the mounting cavity (11) are provided on the side of the cylinder bottom (1); and a flow reduction mechanism (5) is provided on the side of the slide valve (2).

2. According to claim 1, a simple structure oil cylinder explosion-proof device is characterized in that: The flow reduction mechanism (5) comprises: an annular groove (51) and a throttle hole (52); The annular groove (51) is formed on the side surface of the middle part of the slide valve (2), the throttling hole (52) is formed in the annular groove (51), and a through groove (21) is formed on the end surface of the slide valve (2) facing the oil pipe joint (4), and the annular groove (51) is connected with the through groove (21) through the throttling hole (52).

3. The oil cylinder explosion-proof device with a simple structure according to claim 2 is characterized in that: At least two throttling holes (52) are provided on the annular groove (51), and the throttling holes (52) are evenly distributed on the annular groove (51).

4. The oil cylinder explosion-proof device with a simple structure according to claim 1 is characterized in that: A limiting step groove (111) is provided at the bottom of the installation cavity (11), and the bottom of the installation cavity (11) is connected to the lower oil channel (13) via the limiting step groove (111).

5. The oil cylinder explosion-proof device with a simple structure according to claim 4 is characterized in that: The inner diameter of the lower oil passage (13) and the inner diameter of the limiting step groove (111) are both smaller than the outer diameter of the slide valve (2), and the outer wall of the slide valve (2) is tightly fitted with the inner wall of the installation cavity (11).

6. The oil cylinder explosion-proof device with a simple structure according to claim 1 is characterized in that: The end of the slide valve (2) away from the oil pipe joint (4) is configured to be in the shape of a truncated cone, and the end of the slide valve (2) away from the oil pipe joint (4) is provided with an inclined groove (22) for maintaining pressure balance at the bottom of the slide valve (2).

7. The oil cylinder explosion-proof device with a simple structure according to claim 2 is characterized in that: The two ends of the spring (3) are respectively fixedly mounted on the inner wall of the oil pipe joint (4) and the inner wall of the through groove (21).

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