A hydraulic buffer device

Abstract

The present invention discloses a hydraulic buffer device, belonging to the technical field of hydraulic transmission. The hydraulic buffer device includes a main block body and a buffer assembly. The main block body has a hydraulic channel and a control channel. Both ends of the hydraulic channel penetrate through the main block body, and the control channel is communicated with the hydraulic channel. The buffer assembly includes a connecting block, a piston, a piston rod and an elastic member. The connecting block is located on the main block body. One side of the connecting block has a buffer cavity, and the buffer cavity is communicated with the control channel. The piston is coaxially sleeved on the first end of the piston rod. The hydraulic channel is communicated with the hydraulic cavity through a first flow channel. The outer peripheral wall of the second end of the piston rod is in sliding fit with the inner peripheral wall of the control channel to control the opening degree of the hydraulic channel. The elastic member is located in the elastic cavity. The hydraulic buffer device provided by the present invention can avoid the instantaneous impact of hydraulic pressure on the actuator, thereby prolonging the service life of the actuator.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic transmission, and more specifically, relates to a hydraulic buffer device. Background Art

[0002] Hydraulic transmission refers to a transmission method that uses liquid as the working medium for energy transfer and control. Specifically, it utilizes the pressure energy of the liquid for energy conversion. Adopting hydraulic transmission technology in machinery can effectively simplify the structure of the machinery, reduce the weight of the machinery, reduce material consumption, lower manufacturing costs, reduce labor intensity, and improve work efficiency and reliability.

[0003] Nowadays, hydraulic transmission technology is widely applied to various mechanical products. However, during the process of transferring energy from high-pressure liquid to the actuator, it will cause a large instantaneous impact on the actuator, which will not only bring relatively large noise but also affect the service life of the actuator. Summary of the Invention

[0004] In view of the above defects or improvement requirements of the prior art, the present invention provides a hydraulic buffer device, aiming to avoid the instantaneous impact of hydraulic pressure on the actuator, thereby solving the technical problem of the large instantaneous impact of hydraulic pressure on the actuator.

[0005] To achieve the above object, the present invention provides a hydraulic buffer device, and the hydraulic buffer device includes a main block and a buffer assembly;

[0006] The main block has a hydraulic channel and a control channel. Both ends of the hydraulic channel penetrate through the main block, and the control channel is communicated with the hydraulic channel;

[0007] The buffer assembly includes a connecting block, a piston, a piston rod, and an elastic member. The connecting block is located on the main block. One side of the connecting block has a buffer cavity, and the buffer cavity is communicated with the control channel. The piston is coaxially sleeved on the first end of the piston rod. The outer diameter of the piston is larger than the diameter of the control channel. The outer peripheral wall of the piston is slidably matched with the inner peripheral wall of the buffer cavity to divide the buffer cavity into a hydraulic cavity and an elastic cavity. The hydraulic channel is communicated with the hydraulic cavity through a first flow channel. The outer peripheral wall of the second end of the piston rod is slidably matched with the inner peripheral wall of the control channel to control the opening degree of the hydraulic channel. The elastic member is located in the elastic cavity. One side of the elastic member is connected to the connecting block, and the other side of the elastic member is connected to the piston.

[0008] Optionally, the other side of the connecting block has a threaded hole, the threaded hole is communicated with the elastic cavity, a threaded block is fitted and inserted in the threaded hole, and one side of the elastic member is connected to the threaded block.

[0009] Optionally, one side of the threaded block facing the piston rod is provided with a slider. The diameter of the slider is larger than that of the threaded block, and the outer peripheral wall of the slider is in sliding fit with the inner wall of the elastic cavity. One side of the elastic member is connected to the slider.

[0010] Optionally, one side of the threaded hole facing away from the piston rod is provided with a hexagonal counterbore, and the hexagonal counterbore is coaxially arranged with the piston rod.

[0011] Optionally, the outer peripheral wall of the piston is provided with a sealing ring, and the sealing ring is clamped between the outer peripheral wall of the piston and the inner peripheral wall of the buffer cavity.

[0012] Optionally, the hydraulic buffer device further includes a guide rod. The first end of the guide rod is slidably inserted into the piston rod, the second end of the guide rod extends into the elastic cavity, the elastic member is a spring, and the spring is sleeved on the guide rod.

[0013] Optionally, both ends of the control channel penetrate through the main block body. The outer peripheral wall of the second end of the piston rod is in sliding fit with the inner peripheral wall of the first end of the control channel. A plug is inserted into the second end of the control channel. A transition cavity is formed between the plug and the piston rod, and the transition cavity is communicated with the hydraulic channel through a second flow channel.

[0014] Optionally, the outer peripheral wall of the plug is in threaded fit with the inner peripheral wall of the control channel.

[0015] The beneficial effects brought by the technical solution provided by the embodiment of the present invention are as follows:

[0016] For the hydraulic buffer device provided by the embodiment of the present invention, when buffering the hydraulic pressure, one end of the hydraulic channel in the main block body is communicated with the inlet of the hydraulic pressure, and the other end of the hydraulic channel is communicated with the actuator, so that the hydraulic pressure acts on the actuator through the hydraulic channel.

[0017] When the piston rod is in the initial position, under the action of the elastic force of the elastic member, the piston is pushed, causing the piston rod to seal the hydraulic passage. At this time, the opening degree of the hydraulic passage is 0. When hydraulic pressure enters the hydraulic passage, the hydraulic pressure enters the hydraulic chamber through the first flow passage. Due to the accumulation of hydraulic pressure in the hydraulic chamber, the pressure generated by it will gradually increase, and the pressure exerted on the piston is greater than the elastic force of the elastic member, causing the elastic member to be further compressed. As a result, the piston rod is driven to slowly move in the direction of the elastic member, gradually relieving the sealing of the piston rod on the hydraulic passage and increasing the opening degree of the hydraulic passage. This can prevent the hydraulic pressure from flowing instantaneously into the other end of the hydraulic passage and causing an instantaneous impact on the actuator. When the hydraulic operation ends, the hydraulic pressure gradually decreases, which causes the pressure in the hydraulic chamber to gradually decrease. Consequently, the pressure of the hydraulic on the piston is less than the elastic force of the elastic member, causing the piston rod to reset and re-seal the hydraulic passage, completing one working cycle.

[0018] That is to say, the hydraulic buffer device provided by the present invention guides the hydraulic pressure into the hydraulic chamber, causing the piston rod to move slowly, thereby slowly increasing the opening degree of the hydraulic passage, avoiding an instantaneous impact of the hydraulic pressure on the actuator, and thus extending the service life of the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view of the initial state of a hydraulic buffer device provided in this embodiment;

[0020] Figure 2 is a cross-sectional view of the working state of the hydraulic buffer device provided in this embodiment.

[0021] The meanings of the symbols in the figure are as follows:

[0022] 1. Main block; 11. Hydraulic passage; 12. Control passage; 121. Blocking; 122. Transition cavity; 13. First flow passage; 14. Second flow passage; 2. Buffer assembly; 21. Connecting block; 211. Buffer cavity; 2111. Hydraulic chamber; 2112. Elastic cavity; 212. Threaded hole; 2121. Threaded block; 2122. Slide block; 2123. Hexagonal counterbore; 2124. Slot; 22. Piston; 23. Piston rod; 24. Elastic member; 3. Sealing ring; 4. Guide rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] Figure 1 is a cross-sectional view of the initial state of a hydraulic buffer device provided by this embodiment. As Figure 1 shown, the hydraulic buffer device includes a main block 1 and a buffer assembly 2.

[0025] The main block 1 has a hydraulic passage 11 and a control passage 12. Both ends of the hydraulic passage 11 penetrate through the main block 1, and the control passage 12 communicates with the hydraulic passage 11.

[0026] The buffer assembly 2 includes a connecting block 21, a piston 22, a piston rod 23, and an elastic member 24. The connecting block 21 is located on the main block 1. One side of the connecting block 21 has a buffer cavity 211, and the buffer cavity 211 communicates with the control passage 12. The piston 22 is coaxially sleeved on the first end of the piston rod 23. The outer diameter of the piston 22 is larger than the diameter of the control passage 12. The outer peripheral wall of the piston 22 is slidably matched with the inner peripheral wall of the buffer cavity 211 to divide the buffer cavity 211 into a hydraulic cavity 2111 and an elastic cavity 2112. The hydraulic passage 11 communicates with the hydraulic cavity 2111 through a first flow passage 13. The outer peripheral wall of the second end of the piston rod 23 is slidably matched with the inner peripheral wall of the control passage 12 to control the opening degree of the hydraulic passage 11. The elastic member 24 is located in the elastic cavity 2112. One side of the elastic member 24 is connected to the connecting block 21, and the other side of the elastic member 24 is connected to the piston 22.

[0027] For the hydraulic buffer device provided by the embodiment of the present invention, when buffering the hydraulic pressure, one end ( Figure 1 the left end) of the hydraulic passage 11 in the main block 1 is communicated with the inlet of the hydraulic pressure, and the other end ( Figure 1 the right end) of the hydraulic passage 11 is communicated with the actuator, so that the hydraulic pressure acts on the actuator through the hydraulic passage 11.

[0028] When the piston rod 23 is in the initial position, at this time, under the action of the elastic force of the elastic member 24, the piston 22 is acted on, so that the piston rod 23 seals the hydraulic passage 11, and the opening degree of the hydraulic passage 11 is 0 at this time. When the hydraulic pressure enters the hydraulic passage 11, the hydraulic pressure enters the hydraulic cavity 2111 through the first flow passage 13. Due to the accumulation of the hydraulic pressure in the hydraulic cavity 2111, the pressure generated by it will gradually increase, and the pressure acting on the piston 22 is greater than the elastic force of the elastic member 24, so that the elastic member 24 is further compressed, thereby driving the piston rod 23 to slowly move in the direction of the elastic member 24, and then gradually releasing the seal of the piston rod 23 on the hydraulic passage 11 (see Figure 2) and the opening degree of the hydraulic channel 11 is gradually increased, which can avoid the instantaneous impact on the actuator caused by the instantaneous inflow of hydraulic pressure into the other end of the hydraulic channel 11. When the hydraulic work is completed, the hydraulic pressure gradually decreases, which will cause the pressure in the hydraulic chamber 2111 to gradually decrease, so that the pressure of the hydraulic pressure on the piston 22 is less than the elastic force of the elastic member 24, and then the piston rod 23 is reset, and the sealing of the hydraulic channel 11 is realized again, completing a working cycle.

[0029] That is to say, the hydraulic buffer device provided by the present invention guides the hydraulic pressure into the hydraulic chamber 2111, so that the piston rod 23 moves slowly, thereby making the opening degree of the hydraulic channel 11 increase slowly, avoiding the instantaneous impact of the hydraulic pressure on the actuator, and then extending the service life of the actuator.

[0030] In addition, the hydraulic buffer device has a simple structure, a small volume, and strong versatility. It can be applied to hydraulic transmissions with various working pressures and can effectively reduce the instantaneous impact of high-pressure media on the actuator.

[0031] It should be noted that both ends of the main block 1 in the hydraulic buffer device provided in this embodiment can be respectively connected to the hydraulic inlet and the actuator through adapters.

[0032] In addition, the diameter of the lower end of the piston 22 is larger than that of the upper end, so that when the piston 22 abuts against the main block 1, the hydraulic pressure can smoothly enter the hydraulic chamber 2111 after passing through the first flow channel 13 (at this time, the cross-sectional area of the hydraulic chamber 2111 is the difference between the diameter of the lower end and the diameter of the upper end of the piston 22).

[0033] See again Figure 1 , the other side of the connecting block 21 has a threaded hole 212, the threaded hole 212 communicates with the elastic cavity 2112, a threaded block 2121 is fitted and inserted in the threaded hole 212, and one side of the elastic member 24 is connected to the threaded block 2121.

[0034] In the above-mentioned embodiment, on the one hand, it is convenient to replace the elastic member 24 of different models by disassembling the threaded block 2121, so as to realize the adjustment of the damping of the elastic member 24 to adapt to hydraulic pressures of different pressures to ensure the slow movement of the piston rod 23. On the other hand, by adjusting the insertion depth of the threaded block 2121, the initial elastic force of the elastic member 24 can be adjusted, so as to adjust the initial acting force of the elastic member 24 on the piston rod 23, which can not only avoid the easy movement of the piston rod 23 caused by external vibration, but also adapt to hydraulic pressures of different pressures to ensure the slow movement of the piston rod 23.

[0035] In this embodiment, one side of the threaded block 2121 facing the piston rod 23 has a slider 2122. The diameter of the slider 2122 is larger than that of the threaded block 2121, and the outer peripheral wall of the slider 2122 is in sliding fit with the inner wall of the elastic cavity 2112. One side of the elastic member 24 is connected to the slider 2122.

[0036] In the above embodiment, the slider 2122 serves to connect the elastic member 24 and the threaded block 2121. Additionally, by providing the slider 2122 to compress the elastic member 24, it is avoided that the threaded hole 212 is set too long, thus increasing the processing cost.

[0037] Exemplarily, the slider 2122 has a slot 2124 (see Figure 2 ), and the bottom of the elastic member 24 is inserted into the slot 2124.

[0038] Optionally, one side of the threaded hole 212 facing away from the piston rod 23 has a hexagonal counterbore 2123, and the hexagonal counterbore 2123 is coaxially arranged with the piston rod 23.

[0039] In the above embodiment, the hexagonal counterbore 2123 facilitates the cooperation with a hexagonal wrench, thereby facilitating the adjustment of the insertion depth of the threaded block 2121.

[0040] In this embodiment, the outer peripheral wall of the piston 22 has a sealing ring 3, and the sealing ring 3 is clamped between the outer peripheral wall of the piston 22 and the inner peripheral wall of the buffer cavity 211.

[0041] In the above embodiment, the sealing ring 3 can prevent the hydraulic pressure in the hydraulic cavity 2111 from leaking.

[0042] Exemplarily, sealing rings 3 are clamped between the slider 2122 and the inner peripheral wall of the buffer cavity 211, between the piston rod 23 and the inner peripheral wall of the control channel 12, and between the main block 1 and the connecting block 21. Their functions are all to prevent hydraulic leakage, and details will not be elaborated here.

[0043] Optionally, the hydraulic buffer device further includes a guide rod 4. The first end of the guide rod 4 is slidably inserted into the piston rod 23, and the second end of the guide rod 4 extends into the elastic cavity 2112. The elastic member 24 is a spring, and the spring is sleeved on the guide rod 4.

[0044] In the above embodiment, the guide rod 4 guides the spring, avoiding the problem of misalignment during the compression of the spring.

[0045] Exemplarily, the bottom end of the guide rod 4 is inserted into the slot 2124 and abuts against the bottom of the slot 2124.

[0046] In this embodiment, both ends of the control channel 12 penetrate through the main block 1. The outer peripheral wall of the second end of the piston rod 23 is in sliding fit with the inner peripheral wall of the first end of the control channel 12. A plug 121 is inserted into the second end of the control channel 12. A transition cavity 122 is formed between the plug 121 and the piston rod 23. The transition cavity 122 is communicated with the hydraulic channel 11 through a second flow channel 14.

[0047] In the above embodiment, since both ends of the control channel 12 and both ends of the hydraulic channel 11 penetrate through the main block 1, the control channel 12 can penetrate through the hydraulic channel 11, so that the piston rod 23 can pass through the hydraulic channel 11 (the top end of the piston rod 23 passes through the hydraulic channel 11). In this way, the sealing effect of the piston rod 23 on the hydraulic channel 11 at the initial position can be better.

[0048] Exemplarily, when the piston rod 23 moves slowly (downward) in the direction of the elastic member 24, hydraulic pressure will enter the transition cavity 122. When the hydraulic operation ends, during the reset (upward movement) of the piston rod 23, the hydraulic pressure in the transition cavity 122 will be drained through the second flow channel 14, avoiding the compression of the hydraulic pressure in the transition cavity 122, which is not conducive to the reset of the piston rod 23.

[0049] Optionally, the outer peripheral wall of the plug 121 is in threaded fit with the inner peripheral wall of the control channel 12.

[0050] In the above embodiment, the outer peripheral wall of the plug 121 is in threaded fit with the inner peripheral wall of the control channel 12, which facilitates the disassembly of the plug 121. Thus, when the second flow channel 14 is blocked, the hydraulic pressure in the transition cavity 122 can be drained by disassembling the plug 121.

[0051] The working principle of the hydraulic buffer device provided by the present invention is briefly introduced as follows:

[0052] When hydraulic pressure enters the hydraulic channel 11, the hydraulic pressure enters the hydraulic cavity 2111 through the first flow channel 13. Due to the accumulation of the hydraulic pressure in the hydraulic cavity 2111, the pressure generated by it will gradually increase, and the pressure exerted on the piston 22 is greater than the elastic force of the elastic member 24, so that the elastic member 24 is further compressed, thereby driving the piston rod 23 to move slowly in the direction of the elastic member 24, and gradually releasing the seal of the piston rod 23 on the hydraulic channel 11 (see Figure 2 ), and the opening degree of the hydraulic channel 11 is gradually increased. In this way, it can be avoided that the hydraulic pressure instantaneously flows into the other end of the hydraulic channel 11 and causes an instantaneous impact on the actuator. When the hydraulic operation ends, the pressure of the hydraulic pressure gradually decreases, which will cause the pressure in the hydraulic cavity 2111 to gradually decrease, so that the pressure of the hydraulic pressure on the piston 22 is less than the elastic force of the elastic member 24, and then the piston rod 23 is reset, and the seal of the hydraulic channel 11 is re-established, completing a working cycle.

[0053] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hydraulic buffer device, It is characterized in that The hydraulic buffer device comprises a main block (1) and a buffer assembly (2); The main block (1) has a hydraulic channel (11) and a control channel (12), both ends of the hydraulic channel (11) pass through the main block (1), and the control channel (12) is in communication with the hydraulic channel (11); The buffer assembly (2) comprises a connecting block (21), a piston (22), a piston rod (23) and an elastic member (24); the connecting block (21) is located on the main block (1); one side of the connecting block (21) has a buffer cavity (211); the buffer cavity (211) is communicated with the control channel (12); the piston (22) is coaxially sleeved on the first end of the piston rod (23); the outer diameter of the piston (22) is larger than the diameter of the control channel (12); the outer peripheral wall of the piston (22) is slidably matched with the inner peripheral wall of the buffer cavity (211) to adjust the control channel (12) to the desired control channel (12); The buffer chamber (211) is divided into a hydraulic chamber (2111) and an elastic chamber (2112); the hydraulic channel (11) is connected to the hydraulic chamber (2111) via a first flow channel (13); the outer peripheral wall of the second end of the piston rod (23) is slidably matched with the inner peripheral wall of the control channel (12) to control the opening of the hydraulic channel (11); the elastic member (24) is located in the elastic chamber (2112); one side of the elastic member (24) is connected to the connecting block (21), and the other side of the elastic member (24) is connected to the piston (22); A sealing ring (3) is sandwiched between the piston rod (23) and the inner peripheral wall of the control channel (12).

2. A hydraulic buffer device according to claim 1, It is characterized in that The other side of the connection block (21) has a threaded hole (212), the threaded hole (212) is in communication with the elastic cavity (2112), a threaded block (2121) is inserted into the threaded hole (212), and one side of the elastic member (24) is connected to the threaded block (2121).

3. A hydraulic buffer device according to claim 2, It is characterized in that The threaded block (2121) has a slider (2122) on the side facing the piston rod (23); the diameter of the slider (2122) is larger than the diameter of the threaded block (2121); the outer peripheral wall of the slider (2122) is slidably matched with the inner wall of the elastic cavity (2112); and one side of the elastic member (24) is connected to the slider (2122).

4. A hydraulic buffer device according to claim 2, It is characterized in that A hexagonal countersunk hole (2123) is provided on a side of the threaded hole (212) facing away from the piston rod (23), and the hexagonal countersunk hole (2123) is coaxially arranged with the piston rod (23).

5. A hydraulic buffer device according to claim 1, It is characterized in that The outer peripheral wall of the piston (22) is provided with a sealing ring (3), and the sealing ring (3) is clamped between the outer peripheral wall of the piston (22) and the inner peripheral wall of the buffer chamber (211).

6. A hydraulic buffer device according to claim 1, characterized in that the hydraulic buffer device further includes a guide rod (4), the first end of the guide rod (4) is slidably inserted into the piston rod (23), the second end of the guide rod (4) extends into the elastic chamber (2112), and the elastic member (24) is a spring, and the spring is sleeved on the guide rod (4).

7. A hydraulic buffer device according to claim 1, characterized in that both ends of the control channel (12) penetrate through the main block (1), the outer peripheral wall of the second end of the piston rod (23) is in sliding fit with the inner peripheral wall of the first end of the control channel (12), a plug (121) is inserted into the second end of the control channel (12), a transition chamber (122) is formed between the plug (121) and the piston rod (23), and the transition chamber (122) is communicated with the hydraulic channel (11) through a second flow channel (14).

8. A hydraulic buffer device according to claim 7, characterized in that the outer peripheral wall of the plug (121) is in threaded fit with the inner peripheral wall of the control channel (12).

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