Anti-sticking tapping device and submersible pump assembly equipment with the same
The automated design of the anti-jamming impact device solves the problem of rotor and bearing jamming, realizes the automation of rotor impact and the consistency of force, and improves assembly efficiency and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 台州智惠自动化科技有限公司
- Filing Date
- 2026-02-12
- Publication Date
- 2026-05-05
AI Technical Summary
In the current motor assembly process, the jamming between the rotor and the bearing requires manual hammering, which leads to low efficiency and uneven force, affecting the vibration and noise of the motor operation.
An anti-jamming striking device was designed. By improving the precise driving coordination of the push block, hook block, and stroke rod, the rotor striking is automated, ensuring the consistency of striking force and height each time, thus replacing manual operation.
It significantly improves assembly efficiency, avoids rotor damage, reduces vibration and noise during motor operation, and enhances product quality stability.
Smart Images

Figure CN121696685B_ABST
Abstract
Description
Technical Field
[0001] This patent application belongs to the field of automation equipment technology, specifically referring to an anti-jamming impact device and a submersible pump assembly equipment having the device. Background Technology
[0002] The existing motor mainly consists of components such as stator, rotor, end covers, bearings, fan, and junction box. During the assembly process, the stator is first pressed into the housing, then the rotor is installed and the bearings are fixed. Next, the front and rear end covers are installed, the fan and fan cover are connected, and finally the wiring is done and the motor is tested.
[0003] After the bearings and end covers are installed, the assembly personnel will tap the ends of the rotor. This tapping aims to prevent jamming between the rotor and bearings, and to release stress between them, thus avoiding vibration or noise problems caused by stress concentration during motor operation. However, this tapping process is usually performed manually by workers one by one, resulting in relatively low overall efficiency. Summary of the Invention
[0004] The purpose of this patent application is to provide an anti-jamming impact device that automatically completes rotor impact and a submersible pump assembly equipment having the device.
[0005] The purpose of this patent application is achieved as follows:
[0006] Anti-jamming and anti-impact device, including:
[0007] Main cylinder;
[0008] The main pressure head is driven by the main pressure cylinder, and the main pressure head has a hollow axial cavity inside; the side wall of the main pressure head is symmetrically provided with connecting holes that connect the outside to the axial cavity;
[0009] The striking head is movably disposed within the axial cavity, and the lower end of the striking head can extend out of the axial cavity to form a striking end for striking the end of the rotor.
[0010] A travel rod is fixed to the striking head, with corresponding connecting holes extending from both ends of the travel rod to form the abutment end;
[0011] The lifting push block is slidably disposed on the outside of the main pressure head, and the lifting push block is provided with a lifting inclined surface that cooperates with the abutment end;
[0012] A hook block, slidably disposed on the outside of the main pressure head, has a connecting guide rod fixed to it. One end of the connecting guide rod passes through the lifting push block, and a front limiter and a rear limiter are provided on the connecting guide rod; and
[0013] The driving component is used to drive the lifting pusher to slide.
[0014] When the driving component pushes the lifting push block to slide towards the main pressure head, the lifting inclined surface acts on the abutting end of the stroke rod, lifting the striking head upward along the axial cavity; during the lifting process, as the lifting push block moves forward, it abuts against the front limit member on the connecting guide rod, and the lifting push block continues to move forward, pushing the front limit member and the hook block connected to it to slide together until the hook block is at least partially located below the abutting end, thereby supporting the abutting end and maintaining the raised state of the striking head;
[0015] When a striking operation is required, the drive unit pulls the lifting push block away from the main pressure head, and the abutting end disengages from the lifting inclined surface. After the lifting push block retracts to a certain position, it abuts against the rear limit piece on the connecting guide rod and begins to pull the hook block back synchronously. The abutting end instantly loses support, and the striking head falls rapidly along the axial cavity under its own weight or external force, causing its striking end to strike the end of the rotor shaft, thus completing the striking operation.
[0016] Furthermore, both the front and rear ends of the lifting ramp are provided with horizontal surfaces, and the horizontal surfaces smoothly transition into the lifting ramp.
[0017] Furthermore, the front end of the hook block is provided with a hook groove that can engage with the abutment end. When the hook block is slid by the lifting push block, the abutment end engages in the hook block.
[0018] Furthermore, the front limiting member includes a first elastic member sleeved on the connecting guide rod and having its two ends abutting against the hook block and the lifting push block, respectively.
[0019] Furthermore, the lifting push block is U-shaped, with its two arms symmetrically located on both sides of the main pressure head. Each arm has a lifting inclined surface on its upper surface, and the two lifting inclined surfaces cooperate with the abutment ends on the corresponding sides.
[0020] Furthermore, the connecting guide rod between the hook block and the lifting push block is provided with a first elastic element that keeps the hook block pressed towards the abutting end.
[0021] Furthermore, the main pressure head is provided with a support seat, and a first slide rail structure extending in the horizontal direction is fixed on the support seat. The lifting push block is slidably engaged with the first slide rail structure and is driven to reciprocate by a cylinder fixed on the support seat.
[0022] Furthermore, a second elastic element is connected between the support base and the abutment end, the second elastic element being used to keep the striking head inclined to strike the rotor.
[0023] Furthermore, it also includes a wire clamping assembly, which includes:
[0024] The second slide rail structure is fixed to one side of the main pressure head;
[0025] The clamp has two clamps connected to a drive mechanism for opening and closing. The clamp slides on the second slide rail structure to hold the wire and slide it to one side.
[0026] The submersible pump assembly equipment includes a frame, on which the aforementioned anti-jamming and anti-knock-off device is provided.
[0027] The outstanding and beneficial technical effects of this patent application compared to the prior art are:
[0028] This patent automates the hammering action by enhancing the precise driving interaction between the push block, hook block, and stroke rod, replacing traditional manual hammering and significantly improving assembly efficiency, making it suitable for mass production scenarios. By improving the precise control of the push block, it ensures consistent hammering force and height for each strike, avoiding rotor damage caused by uneven force during manual operation. Simultaneously, it reliably releases stress between the rotor and bearings, reducing vibration and noise during motor operation and improving product quality stability. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of the anti-jamming and anti-impact device.
[0030] Figure 2 This is a schematic diagram of the lifting push block in the anti-jamming and knocking device.
[0031] Figure 3 yes Figure 2 This is a cross-sectional diagram.
[0032] Figure 4 This is a schematic diagram of the structure when the push block slides back.
[0033] Figure 5 This is a structural diagram of the lifting push block and hook block.
[0034] Figure 6 This is a structural diagram of the wire clamping assembly.
[0035] Figure 7 This is a schematic diagram of the structure after the clamps are opened.
[0036] The meaning of the labels in the diagram:
[0037] 1. Main cylinder; 11. First support plate; 12. Second support plate; 13. Guide rod;
[0038] 2. Main pressure head; 21. Axial cavity; 22. Support seat; 23. Second elastic element; 24. Pressure head assembly; 25. First slide rail structure; 26. Connecting hole;
[0039] 3. Striking head; 31. Striking end;
[0040] 4. Travel lever; 41. Abutment end;
[0041] 5. Lifting push block; 51. Lifting ramp; 52. Horizontal plane; 53. Connecting guide rod; 532. Rear limit component;
[0042] 6. Hook block; 61. Hook groove; 62. First elastic element;
[0043] 7. Wire clamping assembly; 71. Second slide rail structure; 72. Clamping plate; 73. Barb; 74. Inner pad; 75. Wire clamping bracket;
[0044] 8. Machine barrel; Detailed Implementation
[0045] The present patent application will be further described below with reference to specific embodiments:
[0046] An anti-jamming and knocking device is used in a submersible pump assembly equipment. The submersible pump assembly equipment includes a frame with a turntable on the frame and a tooling on the turntable. The tooling is used to install a barrel 8. The manufacturer will install the rotor and end cap on the barrel 8 by means of equipment or manual means. Then, the assembly equipment on the frame will be used for assembly. The assembly equipment will then be sent to the anti-jamming and knocking device in this patent for press-fitting and fixing and anti-jamming and knocking.
[0047] Combination Figure 1 , 2 As shown, the anti-jamming striking device in this patent includes a main pressure cylinder 1, a main pressure head 2, a striking head 3, a stroke rod 4, a lifting push block 5, and a hook block 6. The main pressure cylinder 1 is located at the top and is fixed to the frame. A first support plate 11 is provided below the main pressure cylinder 1, and a second support plate 12 is provided below the first support plate 11. The main body of the main pressure cylinder 1 is connected to the first support plate 11, and the extended end of the main pressure cylinder 1 is connected to the second support plate 12. Several guide rods 13 passing through the first support plate 11 are fixed on the second support plate 12. The cooperation between the second support plate 12 and the guide rods 13 makes the movement of the main pressure cylinder 1 smoother.
[0048] The main pressure head 2 is fixed under the second support plate 12. In this patent, the bottom of the main pressure head 2 is provided with an irregularly shaped pressure head assembly 24. The pressure head assembly 24 is used to contact the barrel 8 to achieve pressing. The upper part of the pressure head assembly 24 is connected to a support base 22 by several support rods. The support base 22 is used to install the stroke rod 4, the lifting push block 5, and the hook block 6, etc.
[0049] like Figure 2 , 3As shown, the main pressure head 2 is hollow inside, with an axial cavity 21 formed therein. The striking head 3 is axially slidably disposed within the cavity and has a striking end 31 extending downward for striking the rotor. The striking end 31 can extend downward into the pressure head assembly 24 and continue to extend outward to contact the rotor inside the barrel 8 for striking. The stroke rod 4 is fixed to the striking head 3. Symmetrically, there are connecting holes 26 on the side wall of the main pressure head 2, which connect to the outside and the axial cavity 21. The stroke rod 4 radially passes through the connecting holes 26 on the side wall of the main pressure head 2; the extended portion of the stroke rod 4 forms abutment end 41. This patent achieves this by having the stroke rod 4 pass through both ends of the striking head 3, thus forming abutment ends 41 at both ends of the striking head 3.
[0050] The lifting push block 5 is horizontally slidably disposed on the main pressure head 2. The lifting push block 5 has a lifting inclined surface 51 that cooperates with the abutment end 41. The hook block 6 is connected to the lifting push block 5 and slides horizontally with the lifting push block 5. The hook block 6 has a hook groove 61 that can engage with the abutment end 41. Figure 2 , 3 As shown, the support base 22 is located outside the main pressure head 2 and is horizontally arranged. It is provided with a first slide rail structure 25 extending in the horizontal direction. The lifting push block 5 is slidably engaged with the first slide rail structure 25. One end of the support base 22 is provided with a cylinder, which drives the lifting push block 5 to slide back and forth on the first slide rail structure 25.
[0051] The lifting push block 5 in this patent is U-shaped, with its two arms symmetrically located on both sides of the main pressure head 2, and its lower end slidably connected to the first slide rail structure 25. The rear end of the lifting push block 5 is fixedly connected to the cylinder. The two arms of the lifting push block 5 are provided with the lifting inclined surface 51, and the two lifting inclined surfaces 51 respectively cooperate with the abutment end 41 on the corresponding side of the stroke rod 4. At the same time, a roller structure is provided on the abutment end 41.
[0052] The hook block 6 is located inside the lifting push block 5 and is connected to the lifting push block 5 via a connecting guide rod 53. Specifically, a connecting guide rod 53 is fixed on the hook block 6, one end of which passes through the lifting push block 5, and a front limiting member and a rear limiting member 532 are provided on the connecting guide rod 53. Furthermore, in this embodiment, the front limiting member is a first elastic member 62, which is a compression spring sleeved on the outer periphery of the connecting guide rod 53, with both ends of the compression spring abutting against the lifting push block 5 and the hook block 6, respectively. (Reference) Figure 2 , 4The connecting guide rod 53 is fixed to the hook block 6 by fasteners. The other end of the connecting guide rod 53 passes through the through hole of the lifting push block 5. The rear limiting member 532 is a nut provided on the connecting guide rod 53. At this time, the connecting guide rod 53 can slide in the through hole of the lifting push block 5. A sliding sleeve for the lifting push block 5 to slide is provided in the through hole. The hook block 6 is also U-shaped, and hook grooves 61 are provided on both arms. The horizontal height of the hook grooves 61 is slightly higher than the highest point of the lifting inclined surface 51.
[0053] When the driving component pushes the lifting push block 5 to slide towards the main pressure head 2, the lifting inclined surface 51 acts on the abutting end 41 of the stroke rod 4, lifting the striking head 3 upward along the axial cavity 21; during the lifting process, as the lifting push block 5 moves forward, it abuts against the front limit member on the connecting guide rod 53, and the lifting push block 5 continues to move forward, pushing the front limit member and the hook block 6 connected thereto to slide together until the hook block 6 is at least partially located below the abutting end 41, thereby supporting the abutting end 41 and maintaining the lifting state of the striking head 3;
[0054] When a striking operation is required, the drive unit pulls the lifting push block 5 away from the main pressure head 2, and the abutment end 41 disengages from the lifting inclined surface 51. After the lifting push block 5 retracts to a certain position, it abuts against the rear limiter 532 on the connecting guide rod 53, and begins to pull the hook block 6 back synchronously. The abutment end 41 instantly loses support, and the striking head 3 falls rapidly along the axial cavity 21 under its own weight or external force, causing its striking end 31 to strike the end of the rotor shaft, thus completing the striking operation.
[0055] Specifically, during operation, the lifting push block 5 slides forward, and the lifting inclined surface 51 contacts the abutment end 41, simultaneously lifting the stroke rod 4 and the striking head 3. After being lifted to a certain height, the lifting push block 5 simultaneously abuts against the front limit member, causing the hook block 6 to slide, so that the hook groove 61 engages with the abutment end 41. When the lifting push block 5 slides back, refer to... Figure 4 The lifting ramp 51 first disengages from the abutment end 41, while the hook block 6 continues to press against the abutment end 41 under the action of the first elastic member 62 to support the abutment end 41 and keep the striking head 3 in a raised state. At the same time, the lifting push block 5 retracts so that it gradually abuts against the rear limit member 532. When the lifting push block 5 retracts a certain distance and abuts against the rear limit member 532, and the retraction distance exceeds the stroke of the first elastic member 62, the abutment end 41 finally disengages from the hook groove 61. At this moment, the abutment end 41 falls down to the lower side of the lifting ramp 51, causing the striking end 31 of the striking head 3 to extend outward to achieve striking.
[0056] In summary, this patent achieves fully automated hammering by enhancing the precise driving interaction between the push block 5, hook block 6, and stroke rod 4, replacing traditional manual hammering, significantly improving assembly efficiency, and adapting to mass production scenarios. By enhancing the precise control of the push block 5, it ensures consistent hammering force and height for each strike, avoiding rotor damage caused by uneven force during manual operation. Simultaneously, it reliably releases stress between the rotor and bearings, reducing vibration and noise during motor operation, and improving product quality stability.
[0057] Furthermore, both the front and rear ends of the lifting ramp 51 are provided with horizontal surfaces 52, which smoothly transition with the lifting ramp 51. When the lifting push block 5 slides forward under the drive of the cylinder, the abutting end 41 of the stroke rod 4 first contacts the horizontal surface 52 at the front end of the lifting ramp 51, and after a smooth transition, it is lifted upward along the lifting ramp 51 to avoid wear of the components caused by instantaneous impact. When the abutting end 41 is lifted to the high side of the lifting ramp 51, it will fall on the horizontal surface 52 behind the high side. At this time, the hook groove 61 is just aligned with the abutting end 41, which facilitates smooth insertion. When the lifting push block 5 retracts, the abutting end 41 first moves smoothly on the rear horizontal surface 52, and there is no jamming in the whole process.
[0058] Furthermore, a second elastic element 23 is connected between the support base 22 and the abutment end 41. The second elastic element 23 is used to maintain the abutment end 41 in a tendency to strike the rotor. Figure 2 As shown, the second elastic element 23 is a tension spring. One end of it is connected to a preset connection point on the support base 22 via a hook, and the other end is connected to the abutment end 41 of the stroke rod 4. The connection point position is calibrated to ensure that the spring tension direction is consistent with the force direction of the abutment end 41. When the lifting push block 5 drives the abutment end 41 to rise along the lifting slope 51, the second elastic element 23 is stretched and stores elastic potential energy. When the abutment end 41 disengages from the hook groove 61, the elastic potential energy is released, assisting the striking head 3 to fall quickly and enhancing the striking force. When the lifting push block 5 retracts, the second elastic element 23 can drive the abutment end 41 to quickly reset and re-fit with the lifting slope 51, shortening the interval between two strikes.
[0059] Furthermore, it also includes a wire clamping assembly 7, which includes: a second slide rail structure 71, fixed to one side of the main pressure head 2; and a clamping plate 72, which has two clamping mechanisms connected to drive its opening and closing. The clamping plate 72 slides on the second slide rail structure 71 to clamp the wire and slide it to store the wire to one side. Figure 6 , 7As shown, the mounting base of the wire clamping assembly 7 is a wire clamping bracket 75 extending from the support base 22. The second slide rail structure 71 is fixed to the wire clamping bracket 75 by bolts. The clamping plates 72 are two symmetrically arranged flat plate structures. The opening and closing structure that drives the clamping plates 72 to open and close is a small cylinder, which is fixed to the end of the second slide rail structure 71. The cylinder piston rod is connected to the clamping plates 72. The cylinder extends and retracts, causing the two clamping plates 72 to move closer or further apart, thereby clamping and releasing the wire. Before the striking operation, the control system commands the opening and closing structure to drive the clamping plates 72 to open. Then, the wire is accommodated in the open clamping plates 72 by the second slide rail structure 71. Subsequently, the clamping plates 72 close to clamp and slide along the second slide rail structure 71, storing the wire away from the striking area.
[0060] Furthermore, the ends of the plates are provided with barbs 73 to prevent the wire from detaching from between the two clamping plates 72. The opposite ends of both clamping plates 72 are integrally formed with barbs 73, which protrude towards the inside of the clamping plates 72. These barbs 73 can be arc-shaped or angled. When the clamping plates 72 close to clamp the wire under the drive of a cylinder, the barbs 73 hook the wire from both sides, forming a double constraint to ensure a firm clamping. In addition, at least one of the clamping plates 72 has an inner pad 74 on its inner side. The inner pad 74 is in direct contact with the wire. Specifically, at least one clamping plate 72 has an inner pad 74 fixed to its inner side by adhesive or screws. The inner pad 74 is made of wear-resistant, non-slip rubber or silicone material with a finely textured surface to increase friction with the wire. The shape of the inner pad 74 matches the inner contour of the clamping plate 72, ensuring full contact with the wire. When the clamping plates 72 close, the inner pad 74 undergoes slight deformation, tightly conforming to the surface of the wire, enhancing clamping stability and preventing damage to the wire insulation layer.
[0061] The above embodiments are merely preferred embodiments of this patent application and are not intended to limit the scope of protection of this patent application. Therefore, all equivalent changes made to the structure, shape, and principle of this patent application should be covered within the scope of protection of this patent application.
[0062] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this patent application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this patent application, should still fall within the scope of the technical content disclosed in this patent application. Furthermore, the terms such as "above," "below," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this patent application. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this patent application.
[0063] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.
[0064] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.
Claims
1. An anti-jamming and anti-impact device, characterized in that, include: Main pressure cylinder (1); The main pressure head (2) is driven by the main pressure cylinder (1). The main pressure head (2) has a hollow axial cavity (21) inside. The side wall of the main pressure head (2) is symmetrically provided with connecting holes (26) that connect the outside to the axial cavity (21). The striking head (3) is movably disposed in the axial cavity (21), and the lower end of the striking head (3) can extend out of the axial cavity (21) to form a striking end (31) for striking the end of the rotor. The stroke rod (4) is fixed on the striking head (3), and the two ends of the stroke rod (4) pass through the corresponding connecting holes (26) to form the abutment end (41); The lifting push block (5) is slidably disposed on the outside of the main pressure head (2), and the lifting push block (5) is provided with a lifting inclined surface (51) that cooperates with the abutment end (41); The hook block (6) is slidably disposed on the outside of the main pressure head (2). A connecting guide rod (53) is fixed on the hook block (6). One end of the connecting guide rod (53) passes through the lifting push block (5), and a front limit member and a rear limit member (532) are provided on the connecting guide rod (53). as well as The driving component is used to drive the lifting pusher (5) to slide; When the driving component pushes the lifting push block (5) to slide towards the main pressure head (2), the lifting inclined surface (51) acts on the abutting end (41) of the stroke rod (4), lifting the striking head (3) upward along the axial cavity (21); during the lifting process, as the lifting push block (5) moves forward, it abuts against the front limit member on the connecting guide rod (53), and the lifting push block (5) continues to move forward, pushing the front limit member and the hook block (6) connected thereto to slide together until the hook block (6) is at least partially located below the abutting end (41), thereby supporting the abutting end (41) and maintaining the lifting state of the striking head (3); When a striking operation is required, the drive unit pulls the lifting push block (5) away from the main pressure head (2), and the abutting end (41) disengages from the lifting inclined surface (51). After the lifting push block (5) retracts to a certain position, it abuts against the rear limit piece (532) on the connecting guide rod (53) and begins to pull the hook block (6) back synchronously. The abutting end (41) instantly loses support, and the striking head (3) falls rapidly along the axial cavity (21) under its own weight or external force, so that its striking end (31) hits the end of the rotor shaft to complete the striking operation.
2. The anti-jamming impact device according to claim 1, characterized in that: The front and rear ends of the lifting ramp (51) are provided with horizontal surfaces (52), and the horizontal surfaces (52) and the lifting ramp (51) are smoothly transitioned.
3. The anti-jamming impact device according to claim 1, characterized in that: The front end of the hook block (6) is provided with a hook groove (61) that can be engaged with the abutment end (41). When the hook block (6) is moved by the lifting push block (5), the abutment end (41) is engaged in the hook block (6).
4. The anti-jamming impact device according to claim 1, characterized in that: The front limiting member includes a first elastic member (62) sleeved on the connecting guide rod (53) and whose two ends respectively abut against the hook block (6) and the lifting push block (5).
5. The anti-jamming impact device according to claim 1, characterized in that: The lifting push block (5) is U-shaped, with its two arms symmetrically located on both sides of the main pressure head (2). Each arm has a lifting inclined surface (51) on its upper surface, and the two lifting inclined surfaces (51) cooperate with the abutment end (41) on the corresponding side.
6. The anti-jamming impact device according to claim 1, characterized in that: The main pressure head (2) is provided with a support seat (22), and a first slide rail structure (25) extending in the horizontal direction is fixed on the support seat (22). The lifting push block (5) slides with the first slide rail structure (25) and is driven to reciprocate by a cylinder fixed on the support seat (22).
7. The anti-jamming impact device according to claim 6, characterized in that: A second elastic element (23) is connected between the support base (22) and the abutment end (41), the second elastic element (23) being used to keep the striking head (3) tending to strike the rotor.
8. The anti-jamming impact device according to claim 1, characterized in that, It also includes a wire clamping assembly (7), which includes: The second slide rail structure (71) is fixed to one side of the main pressure head (2); The clamp (72) has two opening and closing structures connected to drive it to open and close. The clamp (72) slides on the second slide rail structure (71) to clamp the wire and slide it to store the wire to one side.
9. The anti-jamming impact device according to claim 8, characterized in that: At least one of the clamps (72) has an inner pad (74) on its inner side, and the inner pad (74) is in direct contact with the wire.
10. Submersible pump assembly equipment, characterized in that, It includes a frame, on which is provided an anti-jamming and anti-knocking device as described in any one of claims 1-9.
Citation Information
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