Hydraulic multifunction fracturing pump

By introducing buffer, dustproof, and control components into the fracturing pump, the problems of vibration damage and poor sealing in traditional fracturing pumps have been solved, achieving equipment stability and media flow control, and improving service life and sealing performance.

CN119572875BActive Publication Date: 2026-01-13ROS OFFSHORE ENG (SHANGHAI) LTD
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Patent Information

Application Number
CN202411719092.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2026-01-13
Estimated Expiration
2044-11-28

AI Technical Summary

Technical Problem

Traditional fracturing pumps are prone to vibration during use, which can lead to equipment damage and poor sealing.

Method used

A hydraulic multi-functional fracturing pump was designed, comprising a buffer assembly, a dustproof assembly, and a control assembly. Through structures such as a buffer slide bar, a buffer cylinder, a shock-absorbing pad, a rebound unit, and a lateral buffer unit, the fracturing pump achieves multi-directional buffering to avoid equipment vibration damage. The dustproof assembly prevents dust and foreign objects from entering, and the control assembly regulates the medium flow rate.

Benefits of technology

It effectively reduces vibration damage to fracturing pumps, improves equipment service life, ensures sealing and stability, prevents dust from entering, and achieves controllable media flow.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to the technical field of oil exploitation, in particular to a hydraulic multifunctional fracturing pump, which comprises a fracturing pump body, a plurality of feeding pipes, a plurality of discharging pipes and a buffer assembly. The plurality of feeding pipes and the plurality of discharging pipes are arranged on both sides of the fracturing pump body in sequence. The buffer assembly comprises a plurality of feeding units, a plurality of buffer sliding rods, a plurality of shock-absorbing pads, a plurality of buffer cylinders, a supporting plate, a plurality of rebound units, a supporting seat, a plurality of sliding blocks and a plurality of lateral buffer units. The buffer sliding rods slide in the buffer cylinders, and the shock-absorbing pads can be in contact with the inner walls of the buffer cylinders to provide shock absorption. The supporting plate is continuously pushed downward, and the buffer effect is provided by the rebound units. When the fracturing pump body moves laterally due to vibration, the sliding blocks slide in the sliding grooves, and the lateral buffer effect is provided by the lateral buffer units. Thus, the vibration of the fracturing pump body in multiple directions can be buffered, the deformation and damage of the outer shell caused by forced fixation by bolts can be avoided, and the service life of the fracturing pump body is improved.
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Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, and in particular to a hydraulic multi-functional fracturing pump. Background Technology

[0002] In the field of oil extraction, fracturing is required. Fracturing refers to using hydraulic force to create fractures in oil and gas reservoirs. By artificially creating fractures in the formation, the flow environment of oil underground is improved, and oil well production is increased. It plays an important role in improving the flow conditions at the bottom of the well, slowing down inter-layer movement, and improving the activation of the oil reservoir. Fracturing requires the use of oil fracturing pumps. However, in traditional fracturing pumps, the shapes of the gear housing and motor housing are fixed. When the gear housing is directly connected to the motor housing, there is a shape mismatch, which leads to poor sealing.

[0003] In the existing technology, by setting a limiting groove, the accurate positioning of the second sealing element and the cooperating first sealing element is facilitated. The installation of the first sealing element and the second sealing element can be completed simply by bolting the first sealing plate inside the first sealing cylinder, which makes the installation operation simple and convenient and avoids poor sealing caused by improper installation operation.

[0004] However, in the aforementioned prior art, the fracturing pump will vibrate during use without being buffered, which can easily lead to damage to the fracturing pump. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic multi-functional fracturing pump that solves the problem in the prior art where fracturing pumps vibrate during use without buffering, which easily leads to pump damage.

[0006] To achieve the above objectives, the present invention provides a hydraulic multi-functional fracturing pump, comprising a fracturing pump body, multiple feed pipes, multiple discharge pipes, and a buffer assembly, wherein the multiple feed pipes and the multiple discharge pipes are sequentially arranged on both sides of the fracturing pump body.

[0007] The buffer assembly includes multiple feeding units, multiple buffer slides, multiple shock-absorbing pads, multiple buffer cylinders, a support plate, multiple rebound units, a support base, multiple sliders, and multiple transverse buffer units. Both the fracturing pump body and the support base have grooves. Multiple feeding units are sequentially arranged on the fracturing pump body. Multiple buffer slides are sequentially arranged below the fracturing pump body. Multiple shock-absorbing pads are respectively arranged below their corresponding buffer slides. Multiple buffer cylinders are sequentially arranged above the support plate. Multiple buffer slides are slidably connected to their corresponding buffer cylinders. Multiple rebound units are sequentially arranged between the support plate and the support base. Multiple sliders are slidably connected to their corresponding grooves. The multiple sliders are connected to each other via the transverse buffer units.

[0008] The buffer assembly also includes multiple anti-slip pads, which are fixedly connected to the support base and are distributed sequentially below the support base.

[0009] The feeding unit includes a feeding channel, a telescopic hose, and a mounting flange. One end of the feeding channel is connected to the feeding pipe, and both ends of the telescopic hose are connected to the mounting flange and the other end of the feeding channel, respectively.

[0010] The rebound unit includes a first buffer pressure rod and a first spring. The two ends of the first buffer pressure rod are fixedly connected to the support base and the support plate, respectively. The two ends of the first spring are movably connected to the support base and the support plate, respectively. The first spring is sleeved on the outside of the first buffer pressure rod.

[0011] The transverse buffer unit includes two second buffer pressure cylinders, two second springs, two connecting blocks, a first telescopic rod, and a third spring. The two ends of the two second buffer pressure cylinders are fixedly connected to the slider and the connecting block, respectively. The two ends of the two second springs are movably connected to the slider and the connecting block, respectively. The second springs are sleeved on the outside of the second buffer pressure cylinders. The two ends of the first telescopic rod are fixedly connected to the corresponding connecting block, and the two ends of the third spring are movably connected to the corresponding connecting block, respectively. The third spring is sleeved on the outside of the first telescopic rod.

[0012] The hydraulic multi-functional fracturing pump also includes multiple dustproof components, which are respectively installed on the corresponding feed channels.

[0013] The dustproof assembly includes two sealing plates, two second telescopic rods, and two fourth springs. The two sealing plates are rotatably connected to the feeding channel and are symmetrically distributed inside the feeding channel. The two ends of the second telescopic rods are rotatably connected to the inner wall of the feeding channel and the sealing plates, respectively. The two ends of the fourth springs are movably connected to the inner wall of the feeding channel and the sealing plates, respectively. The fourth springs are sleeved on the outside of the second telescopic rods.

[0014] This invention discloses a hydraulic multi-functional fracturing pump. The pump body is positioned at the location of use by a support base. The feed unit connects to the feed pipe, and the discharge pipe discharges the medium. During operation, the pump body vibrates. At this time, the buffer slide rod slides within the buffer cylinder, and the shock-absorbing pad contacts the inner wall of the buffer cylinder to provide damping. When the damping reaches its limit, the support plate continues to move downwards, and the rebound unit provides further buffering. Simultaneously, when the pump body moves laterally due to vibration, the slider slides within the groove, and the lateral buffer unit provides lateral damping. This structural design allows for multi-directional damping of the pump body's vibrations, preventing deformation and damage to the outer casing after forced bolt fixing, and improving the service life of the pump body. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present invention.

[0017] Figure 2 This is a side view of the overall structure of the first embodiment of the present invention.

[0018] Figure 3 This is the invention Figure 2 A sectional view along line AA.

[0019] Figure 4 This is the invention Figure 3 BB line section view.

[0020] Figure 5 This is the invention Figure 3 Enlarged view of the local structure at point C.

[0021] Figure 6 This is the invention Figure 4 Enlarged view of the local structure at point D.

[0022] 101-Fracturing pump body, 102-Infeed pipe, 103-Outfeed pipe, 104-Buffer slide bar, 105-Shock damping pad, 106-Buffer cylinder, 107-Support plate, 108-Support seat, 109-Slider, 110-Slide groove, 111-Anti-slip pad, 112-Infeed channel, 113-Telescopic hose, 114-Mounting flange, 115-First buffer hydraulic rod, 116-First spring, 117-Second buffer hydraulic cylinder, 118-Second spring, 119-Connecting block, 120-First telescopic rod, 121-Third spring, 201-Sealing plate, 202-Second telescopic rod, 203-Fourth spring, 301-Sealing ring, 302-Valve, 303-Shaft, 304-Handle, 305-Threaded rod, 306-First threaded hole, 307-Second threaded hole. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0024] First embodiment:

[0025] Please see Figures 1 to 4 This invention provides a hydraulic multi-functional fracturing pump, comprising a fracturing pump body 101, multiple feed pipes 102, multiple discharge pipes 103, and a buffer assembly. The buffer assembly includes multiple feed units, multiple buffer slides 104, multiple shock-absorbing pads 105, multiple buffer cylinders 106, a support plate 107, multiple rebound units, a support seat 108, multiple sliders 109, multiple lateral buffer units, and multiple anti-slip pads 111. The fracturing pump body 101 and the support seat 108 both have a sliding groove 110. The feed unit includes a feed channel 112, a telescopic hose 113, and a mounting flange 114. The rebound unit includes a first buffer pressure rod 115 and a first spring 116. The lateral buffer unit includes two second buffer pressure cylinders 117, two second springs 118, two connecting blocks 119, a first telescopic rod 120, and a third spring 121.

[0026] In this embodiment, when the fracturing pump body 101 vibrates, the buffer slide rod 104 slides inside the buffer cylinder 106, and the shock-absorbing pad 105 can contact the inner wall of the buffer cylinder 106 to provide shock absorption. When the buffer reaches its limit, the support plate 107 continues to move downward, and the rebound unit provides a buffering effect. At the same time, when the fracturing pump body 101 moves laterally, the second buffer pressure rod performs buffering and shock absorption, and the slider 109 slides inside the groove 110. This can convert the original rotation direction of the fracturing pump body 101 into lateral movement, thereby achieving a buffering and shock absorption effect.

[0027] The plurality of feed pipes 102 and the plurality of discharge pipes 103 are sequentially arranged on both sides of the fracturing pump body 101. Both the fracturing pump body 101 and the support base 108 have a sliding groove 110. The plurality of feed units are sequentially arranged on the fracturing pump body 101. The plurality of buffer slide rods 104 are sequentially arranged below the fracturing pump body 101. The plurality of shock-absorbing pads 105 are respectively arranged below the corresponding buffer slide rods 104. The plurality of buffer cylinders 106 are sequentially arranged above the support plate 107. The plurality of buffer slide rods 104 are slidably connected to the corresponding buffer cylinders 106. The plurality of rebound units are sequentially arranged between the support plate 107 and the support base 108. The plurality of sliders 109 are slidably connected to the corresponding sliding grooves 110. The plurality of sliders 109 are connected to each other through the transverse buffer units. The fracturing pump body 101 is placed at the location of use by the support base 108, and the feed unit is connected to the feed pipe 102. Then the discharge pipe 103 discharges the medium. When the fracturing pump body 101 vibrates during operation, the buffer slide rod 104 slides in the buffer cylinder 106, and the shock-absorbing pad 105 can contact the inner wall of the buffer cylinder 106 to provide shock absorption. When the buffer reaches the limit, the support plate 107 continues to move downward, and the rebound unit provides a buffering effect. At the same time, when the fracturing pump body 101 moves laterally due to vibration, the slider 109 slides in the groove 110, and the lateral buffer unit provides lateral buffering.

[0028] Secondly, multiple anti-slip pads 111 are fixedly connected to the support base 108 and are distributed sequentially below the support base 108. The anti-slip pads 111 can prevent the support base 108 from slipping and improve the overall installation stability.

[0029] Meanwhile, one end of the feed channel 112 is connected to the feed pipe 102, and both ends of the telescopic hose 113 are connected to the mounting flange 114 and the other end of the feed channel 112, respectively. The feed source is connected via the mounting flange 114. When the fracturing pump body 101 vibrates and moves, the telescopic hose 113 moves accordingly. Finally, the transported medium reaches the feed pipe 102 through the telescopic hose 113 and the feed channel 112.

[0030] In addition, the two ends of the first buffer pressure rod 115 are fixedly connected to the support base 108 and the support plate 107, respectively, and the two ends of the first spring 116 are movably connected to the support base 108 and the support plate 107, respectively. The first spring 116 is sleeved on the outside of the first buffer pressure rod 115. When the support plate 107 moves down, the first buffer pressure rod 115 plays a role in buffering and shock absorption. After the shock absorption is completed, the first spring 116 drives the support plate 107 to rebound. At the same time, due to the action of the first buffer pressure rod 115, the rebound speed is not too fast, so as to prevent the fracturing pump body 101 from bouncing up.

[0031] Finally, the two ends of the two second buffer pressure rods are fixedly connected to the slider 109 and the connecting block 119, respectively. The two ends of the two second springs 118 are movably connected to the slider 109 and the connecting block 119, respectively. The second springs 118 are sleeved on the outside of the second buffer pressure rods. The two ends of the first telescopic rod 120 are fixedly connected to the corresponding connecting block 119, respectively. The two ends of the third spring 121 are movably connected to the corresponding connecting block 119, respectively. The third spring 121 is sleeved on the outside of the first telescopic rod 120. When the fracturing pump body 101 moves laterally, the second buffer pressure rod provides buffering and shock absorption, while the slider 109 slides within the groove 110. This converts the original rotation direction of the fracturing pump body 101 into lateral movement, achieving a buffering and shock absorption effect. After buffering, the second spring 118 rebounds, causing the fracturing pump body 101 to reset. When the fracturing pump body 101 moves downward, the first telescopic rod 120 moves accordingly. Relying on the connection between the first telescopic rod 120 and the two connecting blocks 119, the upper and lower sliders 109 can move synchronously. The third spring 121 assists the fracturing pump in moving upward and rebounding, preventing the fracturing pump body 101 from being too heavy and unable to fully reset.

[0032] When using a hydraulic multi-functional fracturing pump according to this embodiment, the fracturing pump body 101 is placed at the location of use by the support base 108, and connected to the delivery source by the mounting flange 114. When the fracturing pump body 101 vibrates and moves, the telescopic hose 113 moves accordingly. Finally, the delivery medium reaches the feed pipe 102 through the telescopic hose 113 and the feed channel 112, and then the discharge pipe 103 discharges the medium. When the fracturing pump body 101 vibrates during operation, the buffer slide rod 104 slides inside the buffer cylinder 106, and the shock-absorbing pad 105 contacts the inner wall of the buffer cylinder 106 to provide damping. When the damping reaches its limit, the support plate 107 continues to move downwards, providing a buffering effect through the rebound unit. Simultaneously, when the fracturing pump body 101 moves laterally, the second buffer... The pressure rod provides cushioning and shock absorption, while the slider 109 slides within the groove 110. This converts the original rotational direction of the fracturing pump body 101 into lateral movement, achieving a cushioning and shock absorption effect. After the cushioning is complete, the second spring 118 rebounds, causing the fracturing pump body 101 to return to its original position. When the fracturing pump body 101 moves downward, the first telescopic rod 120 moves accordingly. Relying on the connection between the first telescopic rod 120 and the two connecting blocks 119, the upper and lower sliders 109 can move synchronously. The third spring 121 assists the fracturing pump in moving upward and rebounding, preventing the fracturing pump body 101 from being too heavy and unable to fully return to its original position. Through the above structural design, multiple directions of vibration of the fracturing pump body 101 can be cushioned, avoiding deformation and damage to the outer shell after forced fixing with bolts, and improving the service life of the fracturing pump body 101.

[0033] Second embodiment:

[0034] Based on the first embodiment, please refer to Figure 5 The present invention provides a hydraulic multi-functional fracturing pump, which also includes multiple dustproof components, including two sealing plates 201, two second telescopic rods 202 and two fourth springs 203.

[0035] In this embodiment, the sealing plate 201 closes the feed channel 112 under the action of the fourth spring 203. However, the elasticity of the fourth spring 203 is low, and it is only necessary to ensure that the sealing plate 201 can close the feed channel 112. When there is medium flowing in the feed channel 112, the medium will push open the sealing plate 201, so that the feed channel 112 opens.

[0036] Multiple dustproof components are respectively installed on the corresponding feed channels 112. The dustproof components prevent dust and foreign objects from entering the feed pipe 102 when the feed channels 112 are not in use.

[0037] Secondly, both sealing plates 201 are rotatably connected to the feed channel 112 and symmetrically distributed inside the feed channel 112. The two ends of the second telescopic rod 202 are rotatably connected to the inner wall of the feed channel 112 and the sealing plates 201, respectively. The two ends of the fourth spring 203 are movably connected to the inner wall of the feed channel 112 and the sealing plates 201, respectively. The fourth spring 203 is sleeved on the outside of the second telescopic rod 202. Under the action of the fourth spring 203, the sealing plate 201 closes the feed channel 112. However, the elasticity of the fourth spring 203 is low; it only needs to ensure that the sealing plate 201 can close the feed channel 112. When there is medium flowing in the feed channel 112, the medium will push open the sealing plate 201, causing the feed channel 112 to open. After the medium flows away, the sealing plate 201 continues to spring back to its original position, while the second telescopic rod 202 assists in movement, improving stability.

[0038] When using a hydraulic multi-functional fracturing pump according to this embodiment, the sealing plate 201 closes the feed channel 112 under the action of the fourth spring 203. However, the elasticity of the fourth spring 203 is low, and it is only necessary to ensure that the sealing plate 201 can close the feed channel 112. When there is medium flowing in the feed channel 112, the medium will push open the sealing plate 201, so that the feed channel 112 opens. After the medium flows away, the sealing plate 201 continues to rebound and reset. At the same time, the second telescopic rod 202 assists in the movement to improve stability. Through the above structural setting, when the feed channel 112 is not in use, dust and foreign objects are prevented from entering the feed pipe 102.

[0039] Third embodiment:

[0040] The hydraulic multi-functional fracturing pump also includes multiple control components, which are respectively disposed on the corresponding feed channels 112. Each control component includes a sealing ring 301, a valve 302, a rotating shaft 303, a handle 304, and a threaded rod 305. The sealing ring 301 is fixedly connected to the feed channel 112 and located inside the feed channel 112. The valve 302 is adapted to the sealing ring 301. One end of the rotating shaft 303 passes through the feed channel 112 and the sealing ring 301 in sequence and is fixedly connected to the valve 302. The other end of the rotating shaft 303 is fixedly connected to the handle 304. The handle 304 has a first threaded hole 306. The feed channel 112 has multiple second threaded holes 307. The threaded rod 305 is adapted to both the first threaded hole 306 and the second threaded holes 307.

[0041] Based on the second embodiment, please refer to Figure 6 The present invention provides a hydraulic multi-functional fracturing pump, which also includes multiple control components, including a sealing ring 301, a valve 302, a rotating shaft 303, a throttle 304, and a threaded rod 305.

[0042] In this embodiment, the sealing ring 301 seals the gap between the valve 302 and the feed channel 112 to prevent leakage. Rotating the handle 304 drives the rotating shaft 303 to rotate, which in turn drives the valve 302 to rotate, adjusting the flow rate to a suitable level.

[0043] The control components are respectively disposed on the corresponding feed channels 112. The control components can control the flow rate of the medium in the feed channels 112.

[0044] Secondly, the sealing ring 301 is fixedly connected to the feed channel 112 and located inside the feed channel 112. The valve 302 is adapted to the sealing ring 301. One end of the rotating shaft 303 passes through the feed channel 112 and the sealing ring 301 in sequence and is fixedly connected to the valve 302. The other end of the rotating shaft 303 is fixedly connected to the handle 304. The handle 304 has a first threaded hole 306. The feed channel 112 has multiple second threaded holes 307. The threaded rod 305 is adapted to both the first threaded hole 306 and the second threaded hole 307. The sealing ring 301 seals the gap between the valve 302 and the feed channel 112 to prevent leakage. Rotating the handle 304 drives the rotating shaft 303 to rotate, which in turn drives the valve 302 to rotate, adjusting the flow rate. Once a suitable flow rate is reached, the threaded rod 305 is rotated to engage with the first threaded hole 306, and then moves downward to be screwed into the second threaded hole 307, thus fixing the rotating shaft 303 and the valve 302.

[0045] When using a hydraulic multi-functional fracturing pump according to this embodiment, the sealing ring 301 seals the gap between the valve 302 and the feed channel 112 to prevent leakage. Rotating the handle 304 drives the rotating shaft 303 to rotate, which in turn drives the valve 302 to rotate, adjusting the flow rate. After reaching a suitable flow rate, rotating the threaded rod 305 engages with the first threaded hole 306, and then moves downwards to screw into the second threaded hole 307, thus fixing the rotating shaft 303 and the valve 302. This allows for control of the medium flow rate in the feed channel 112.

[0046] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments and equivalent variations made in accordance with the claims of this application are still within the scope of this application.

Claims

1. A hydraulic multi-functional fracturing pump, comprising a fracturing pump body, multiple feed pipes, and multiple discharge pipes, wherein the multiple feed pipes and the multiple discharge pipes are sequentially arranged on both sides of the fracturing pump body, characterized in that, It also includes buffer components; The buffer assembly includes multiple feeding units, multiple buffer slides, multiple shock-absorbing pads, multiple buffer cylinders, a support plate, multiple rebound units, a support base, multiple sliders, and multiple transverse buffer units. Both the fracturing pump body and the support base have grooves. Multiple feeding units are sequentially arranged on the fracturing pump body. Multiple buffer slides are sequentially arranged below the fracturing pump body. Multiple shock-absorbing pads are respectively arranged below their corresponding buffer slides. Multiple buffer cylinders are sequentially arranged above the support plate. Multiple buffer slides are slidably connected to their corresponding buffer cylinders. Multiple rebound units are sequentially arranged between the support plate and the support base. Multiple sliders are slidably connected to their corresponding grooves. The multiple sliders are connected to each other via the transverse buffer units. The rebound unit includes a first buffer pressure rod and a first spring. The two ends of the first buffer pressure rod are fixedly connected to the support base and the support plate, respectively. The two ends of the first spring are movably connected to the support base and the support plate, respectively. The first spring is sleeved on the outside of the first buffer pressure rod. The transverse buffer unit includes two second buffer pressure cylinders, two second springs, two connecting blocks, a first telescopic rod, and a third spring. The two ends of the two second buffer pressure cylinders are fixedly connected to the slider and the connecting block, respectively. The two ends of the two second springs are movably connected to the slider and the connecting block, respectively. The second springs are sleeved on the outside of the second buffer pressure cylinders. The two ends of the first telescopic rod are fixedly connected to the corresponding connecting block, and the two ends of the third spring are movably connected to the corresponding connecting block, respectively. The third spring is sleeved on the outside of the first telescopic rod.

2. The hydraulic multi-functional fracturing pump as described in claim 1, characterized in that, The buffer assembly also includes multiple anti-slip pads, which are fixedly connected to the support base and are distributed sequentially below the support base.

3. The hydraulic multi-functional fracturing pump as described in claim 2, characterized in that, The feeding unit includes a feeding channel, a telescopic hose, and a mounting flange. One end of the feeding channel is connected to the feeding pipe, and both ends of the telescopic hose are connected to the mounting flange and the other end of the feeding channel, respectively.

4. The hydraulic multi-functional fracturing pump as described in claim 3, characterized in that, The hydraulic multi-functional fracturing pump also includes multiple dustproof components, which are respectively installed on the corresponding feed channels.

5. The hydraulic multi-functional fracturing pump as described in claim 4, characterized in that, The dustproof assembly includes two sealing plates, two second telescopic rods, and two fourth springs. The two sealing plates are rotatably connected to the feed channel and are symmetrically distributed inside the feed channel. The two ends of the second telescopic rods are rotatably connected to the inner wall of the feed channel and the sealing plates, respectively. The two ends of the fourth springs are movably connected to the inner wall of the feed channel and the sealing plates, respectively. The fourth springs are sleeved on the outside of the second telescopic rods.

Citation Information

Patent Citations

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    CN209892430U

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