A wedge for a contact type backstop

Abstract

The application relates to a wedge body for a contact type check valve, which comprises a base, a wedge block assembly, a guide mechanism and a reset device. The wedge block assembly realizes quick response and stable self-locking through the wedge-shaped cooperation of a main wedge block and a secondary wedge block and elastic limiting pieces; the guide mechanism adopts a double guide rod design, combines with friction reduction pads to reduce friction and ensure linear motion; the reset device accurately controls the pre-tightening force through an adjusting bolt to ensure smooth reset. The base is provided with a lubricating system and a limiting baffle, thereby prolonging the service life and safety. The application is suitable for high-frequency and high-load working conditions, solves the problems of slow response, unreliable self-locking and easy wear in the prior art, and has significant technical progress and application value.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical transmission technology, specifically a wedge assembly for a contact-type backstop. Background Technology

[0002] With the increasing demands for safety and reliability in industrial transmission systems, contact-type backstops, as key components preventing equipment reversal, have been widely used in mining, metallurgy, power, and conveying machinery. Among these, the wedge-shaped locking element, as the core working element for achieving the one-way locking function of the contact-type backstop, directly affects the backstop's response sensitivity, load-bearing capacity, and service life. An ideal wedge-shaped locking element should possess characteristics such as rapid response, reliable self-locking, low wear, and long service life to adapt to frequent start-stop and high-load conditions.

[0003] A search revealed a thin, high-lift clamping block with publication number CN105703294B, published on January 2, 2018. This technical solution discloses a structure consisting of left and right wedges and upper and lower wedges that engage through wedge-shaped surfaces to form a wedge-shaped body. By setting staggered grooves on the end faces of the left and right wedges, the protrusions formed during relative movement interlock, thereby increasing the movement limit distance and improving the vertical lift, achieving enhanced lift performance without increasing the overall thickness. While this structure achieves a thinner clamping block and a higher lift, its design primarily serves spatial limiting and clamping scenarios in electrical installations, emphasizing static clamping and spatial adaptability, without considering rapid response under dynamic conditions or self-locking stability during repeated wedge engagement and release. Furthermore, this structure lacks optimized design for the wedge movement guidance and reset mechanism, which cannot meet the requirements of the backstop for rapid and precise wedge insertion and disengagement during high-speed forward and reverse switching. It is prone to response lag or jamming, and therefore is not suitable for backstop applications with high frequency and high dynamic performance requirements.

[0004] A search revealed a slip-type downhole instrument hanger with publication number CN1807833B, published on May 12, 2010. This technical solution uses a wedge-shaped inclined surface on the main body to engage with external slips. A connecting rod and spring work together to achieve radial expansion and contraction of the slips, thus suspending and releasing the instrument within the tubing. This structure utilizes the inclined surface engagement between the wedge-shaped inclined surface and the slips to achieve radial locking, possessing a certain degree of automatic wedging capability, and is simple in structure and easy to operate. However, this device is mainly used for static suspension of downhole instruments, operating in low-speed or even static environments, and does not consider the centrifugal force effect and dynamic balance issues of the wedging element under high-speed rotation conditions. Furthermore, it relies on a spring for reset; the spring is prone to fatigue failure under long-term stress, and the contact between the slips and the inclined surface is point or line contact, resulting in severe local stress concentration, poor wear resistance, and easy wear and locking failure under frequent operation. Furthermore, the structure lacks an optimized design for the wedge angle, making it impossible to achieve a reliable unidirectional self-locking function and failing to meet the requirement of long-term stable locking of contact-type backstops under reverse loads.

[0005] The aforementioned problems indicate that while existing technologies employ mechanical structures based on the wedge-locking principle, their applications are primarily limited to static clamping or low-speed suspension. They lack comprehensive performance designs for the backstop function required under high-speed, high-reliability, and frequent-operation conditions, including rapid response, stable self-locking, wear resistance, and reliable reset. Therefore, existing wedge-locking structures cannot meet the demands of modern contact-type backstops for high dynamic performance, long lifespan, and high safety.

[0006] Therefore, this utility model provides a wedge engagement body for a contact-type backstop, aiming to solve the problems of slow response, unreliable self-locking, easy wear, and difficult reset in the existing wedge engagement structure. By optimizing the geometry of the wedge block, the guide structure, and the elastic reset mechanism, the wedge engagement body achieves the performance goals of free forward rotation, rapid reverse locking, and stable and reliable repeated action, and is suitable for backstop protection of various high-requirement industrial transmission systems. Utility Model Content

[0007] This utility model relates to a wedge assembly for a contact-type check valve, comprising a base, a wedge block assembly, a guide mechanism, and a reset device. The base has an internal mounting cavity, the wedge block assembly is mounted within the mounting cavity, the guide mechanism is disposed on both sides of the wedge block assembly, and the reset device is connected to the bottom of the wedge block assembly and fixedly connected to the base.

[0008] The wedge assembly includes a main wedge, a secondary wedge, and an elastic limiting member. One side of the main wedge has a beveled structure, which forms a wedge-shaped fit with the mating surface of the secondary wedge. The other side of the main wedge has a protrusion that embeds into a groove in the base and moves along the groove. The outer side of the secondary wedge has an arc-shaped contact surface for contacting external transmission components, and the inner side of the secondary wedge has a guide groove that is slidably connected to a guide rod of a guiding mechanism. The elastic limiting member is positioned between the main and secondary wedges, with one end fixed in a groove in the main wedge and the other end abutting against the inner wall of the secondary wedge, providing preload to maintain the stability of the wedge-shaped fit.

[0009] The guiding mechanism includes a guide rod, a limiting plate, and a friction-reducing pad. One end of the guide rod is fixed to the inner wall of the base, and the other end passes through the guide groove of the sub-wedge and connects to the limiting plate. The friction-reducing pad is sleeved on the outside of the guide rod and contacts the inner wall of the guide groove of the sub-wedge to reduce sliding friction. Two guide rods are provided, one on each side of the sub-wedge, to ensure that the sub-wedge maintains a straight trajectory during movement.

[0010] The reset device includes a reset spring, an adjusting bolt, and a support base. One end of the reset spring is fixed to the bottom of the main wedge block, and the other end is connected to the base via the support base. The adjusting bolt passes through the support base and is threadedly connected to the base, used to adjust the preload of the reset spring. The outer diameter of the reset spring is smaller than the inner diameter of the support base, and both ends of the reset spring are provided with positioning rings to prevent the spring from shifting during compression or tension.

[0011] One side of the base is provided with an oil inlet hole, which connects to the mounting cavity for injecting lubricating oil into the wedge assembly and guide mechanism. The other side of the base is provided with an oil drain hole for discharging waste oil. The top of the base is provided with a limiting baffle, and the inner side of the limiting baffle is provided with a buffer pad to limit the movement range of the main wedge and the secondary wedge and avoid mechanical damage caused by overload.

[0012] The inclined surface angle of the main wedge is optimized, ranging from 5° to 15°, to ensure rapid disengagement from the locked state during forward rotation and quick self-locking during reverse rotation. The arc-shaped contact surface of the secondary wedge is hardened to a surface hardness of HRC58 or higher to improve wear resistance. The elastic limiting component is made of fatigue-resistant material with an elastic modulus ranging from 10GPa to 20GPa to meet the requirements of high-frequency operation.

[0013] This invention, through the aforementioned structural design, solves the problems of slow response, unreliable self-locking, easy wear, and difficult reset in existing technologies. Specifically, the wedge-shaped fit design of the main and auxiliary wedges, combined with the function of the elastic limiting component, enables rapid response and stable self-locking under dynamic working conditions; the double guide rod design of the guiding mechanism effectively avoids the offset of the auxiliary wedge during movement, while the application of anti-friction pads reduces sliding friction; the reset device achieves precise control of the preload through adjusting bolts, ensuring a smooth and reliable reset process; the lubrication system of the base and the design of the limiting baffle further improve the service life and operational safety of the equipment.

[0014] This invention is applicable to industrial transmission systems under high frequency and high load conditions. It can meet the requirements of contact-type backstops for fast response, stable self-locking and long service life, and has significant technological progress and practical application value. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0017] The attached diagram is labeled as follows: 1. Base; 2. Main wedge block; 3. Secondary wedge block; 4. Elastic limiting component; 5. Guide rod; 6. Anti-friction pad; 7. Limiting plate; 8. Return spring; 9. Adjusting bolt; 10. Support seat; 11. Oil inlet hole; 12. Oil outlet hole; 13. Limiting baffle. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] Specific implementation examples are given below.

[0020] like Figures 1 to 2 As shown, this utility model provides a wedge assembly for a contact-type check valve, which includes a base 1, a wedge block assembly, a guide mechanism, and a reset device. The base 1 has an internal mounting cavity, within which the wedge block assembly is installed. The guide mechanism is located on both sides of the wedge block assembly, and the reset device is connected to the bottom of the wedge block assembly and fixedly connected to the base 1. The specific structure of each component and their interrelationships are described in detail below with reference to the accompanying drawings.

[0021] The base 1 is the core load-bearing component of the overall structure. It is rectangular and box-shaped, with an internal mounting cavity to accommodate the wedge assembly and other related components. One side of the base 1 has a circular oil inlet 11, and the other side has a circular oil outlet 12. Both the oil inlet 11 and the oil outlet 12 connect to the mounting cavity, forming a channel for the lubrication system. The oil inlet 11 is located at the upper part of the base 1, and the oil outlet 12 is located at the lower part. Lubricating oil enters the mounting cavity through the oil inlet 11, evenly covering the key parts of the wedge assembly and guide mechanism, and finally drains through the oil outlet 12. A limiting baffle 13 is located at the top of the base 1. A buffer pad is adhered to the inner side of the limiting baffle 13 to limit the movement range of the main wedge 2 and the secondary wedge 3. The limiting baffle 13 is fixed to the top of the base 1 with screws, and its position is precisely designed to ensure that the main wedge 2 and the secondary wedge 3 do not exceed the predetermined range during movement.

[0022] The wedge assembly includes a main wedge 2, a secondary wedge 3, and an elastic limiting member 4. One side of the main wedge 2 has an inclined surface with an angle ranging from 5° to 15°, forming a wedge-shaped fit with the mating surface of the secondary wedge 3. The other side of the main wedge 2 has a protrusion that embeds into a groove in the inner wall of the base 1 and moves along the groove. The width of the groove matches the thickness of the protrusion, ensuring a stable and unbiased movement trajectory of the main wedge 2 within the groove. The bottom of the main wedge 2 has a groove for mounting one end of the elastic limiting member 4. The outer side of the secondary wedge 3 has an arc-shaped contact surface that has been hardened to a surface hardness of HRC58 or higher to improve wear resistance. The inner side of the secondary wedge 3 has a guide groove whose width matches the diameter of the guide rod 5, and the guide groove is slidably connected to the guide rod 5 of the guide mechanism. The elastic limiting member 4 is made of fatigue-resistant material with an elastic modulus ranging from 10GPa to 20GPa. One end of the elastic limiting member 4 is fixed in the groove of the main wedge block 2, and the other end abuts against the inner wall of the secondary wedge block 3 to maintain the stability of the wedge fit between the main wedge block 2 and the secondary wedge block 3.

[0023] The guiding mechanism includes guide rods 5, friction-reducing pads 6, and limiting plates 7. Two guide rods 5 are provided, one on each side of the sub-wedge block 3. One end of each guide rod 5 is welded to the inner wall of the base 1, and the other end passes through the guide groove of the sub-wedge block 3 and connects to the limiting plate 7. The friction-reducing pads 6 are fitted onto the outer side of the guide rods 5 and contact the inner wall of the guide groove of the sub-wedge block 3. The friction-reducing pads 6 are made of polytetrafluoroethylene (PTFE) and are used to reduce friction during the sliding process of the sub-wedge block 3. The limiting plate 7 is fixed to the end of the guide rods 5 by a threaded connection to prevent the sub-wedge block 3 from falling off the guide rods 5. The length of the guide rods 5 is slightly greater than the depth of the guide groove of the sub-wedge block 3, so that the sliding range of the sub-wedge block 3 on the guide rods 5 is limited by the limiting plate 7, thereby ensuring that the sub-wedge block 3 maintains a straight trajectory during movement.

[0024] The reset device includes a reset spring 8, an adjusting bolt 9, and a support base 10. One end of the reset spring 8 is welded to the bottom of the main wedge block 2, and the other end is connected to the base 1 via the support base 10. The support base 10 is fixed to the bottom of the base 1 with screws. The adjusting bolt 9 passes through the support base 10 and is threadedly connected to the base 1, used to adjust the preload of the reset spring 8. The outer diameter of the reset spring 8 is smaller than the inner diameter of the support base 10, and each end of the reset spring 8 is provided with a positioning ring. The diameter of the positioning ring is slightly larger than the outer diameter of the reset spring 8, used to prevent the reset spring 8 from shifting during compression or tension. The head of the adjusting bolt 9 has a hexagonal groove for easy operation with a wrench. By rotating the adjusting bolt 9, the compression of the reset spring 8 can be changed, thereby achieving precise control of the preload.

[0025] During actual operation, when the external transmission component rotates forward, the arc-shaped contact surface of the auxiliary wedge block 3 is pushed by the external transmission component, and the auxiliary wedge block 3 slides away from the main wedge block 2 along the guide rod 5. The main wedge block 2 remains stationary under the action of the return spring 8. At this time, the wedge fit between the main wedge block 2 and the auxiliary wedge block 3 is released, and the backstop is in the unlocked state. When the external transmission component rotates in the reverse direction, the arc-shaped contact surface of the auxiliary wedge block 3 is subjected to the reverse pressure of the external transmission component, and the auxiliary wedge block 3 slides towards the main wedge block 2 along the guide rod 5. The inclined structure of the main wedge block 2 and the mating surface of the auxiliary wedge block 3 re-form a wedge fit relationship. The elastic limiting member 4 provides preload to maintain the stability of the wedge fit. At this time, the backstop is in the self-locking state.

[0026] Under high-frequency, high-load conditions, the double guide rod 5 design of the guide mechanism effectively avoids the offset problem of the secondary wedge 3 during movement. Simultaneously, the application of the anti-friction pad 6 reduces sliding friction, ensuring smooth and reliable movement of the secondary wedge 3. The reset device achieves precise control of the preload through the adjusting bolt 9, ensuring that the main wedge 2 can quickly reset in the unlocked state. The lubrication system of the base 1 injects lubricating oil into the mounting cavity through the oil inlet 11. The lubricating oil evenly covers the wedge assembly and key parts of the guide mechanism, and finally discharges waste oil through the oil drain hole 12, thereby reducing wear between components and extending the service life of the equipment. The design of the limit baffle 13 and its buffer pad further improves the operational safety of the equipment, avoiding mechanical damage caused by overload.

[0027] The above structural design is suitable for contact-type backstops in industrial transmission systems, enabling rapid response and stable self-locking under dynamic operating conditions, meeting the requirements of high-frequency and high-load operation. To better enable those skilled in the art to fully understand and implement this invention, the specific implementation principle is further explained below with reference to a specific application scenario.

[0028] In practical industrial transmission systems, contact-type backstops with wedges are applied to the drive shafts of conveying machinery to prevent reverse rotation caused by load changes or emergency shutdowns. The following describes its operation and principle in detail with reference to the accompanying drawings.

[0029] First, when the conveyor starts, the external transmission component (such as the drive gear) rotates forward, and its surface moves relative to the arc-shaped contact surface of the auxiliary wedge 3. Since the arc-shaped contact surface is hardened and has a surface hardness of HRC58 or higher, it effectively resists wear and ensures long-term reliability. At this time, the auxiliary wedge 3 is pushed by the external transmission component and slides away from the main wedge 2 along the guide rod 5. The guide rod 5 is designed with a double-guide structure, located on both sides of the auxiliary wedge 3, and the sliding range of the auxiliary wedge 3 is limited by the limiting plate 7, thus preventing the auxiliary wedge 3 from shifting during movement. Furthermore, the anti-friction pad 6, made of polytetrafluoroethylene, is sleeved on the outside of the guide rod 5 and contacts the inner wall of the guide groove of the auxiliary wedge 3, significantly reducing sliding friction and ensuring smooth and reliable movement of the auxiliary wedge 3. At the same time, the main wedge 2 remains stationary under the action of the return spring 8. One end of the elastic limiting member 4 is fixed in the groove of the main wedge 2, and the other end abuts against the inner wall of the secondary wedge 3, providing a certain pre-tightening force, but not enough to maintain the wedge-shaped engagement. Therefore, the wedge-shaped engagement between the main wedge 2 and the secondary wedge 3 is released, the backstop is in the unlocked state, and the external transmission components are allowed to rotate freely in the forward direction.

[0030] Secondly, when the external transmission component rotates in reverse due to a malfunction or emergency stop, the arc-shaped contact surface of the auxiliary wedge 3 is subjected to the reverse pressure of the external transmission component and slides along the guide rod 5 towards the main wedge 2. At this time, the inclined structure of the main wedge 2 and the mating surface of the auxiliary wedge 3 re-form a wedge-shaped fit. The inclined angle of the main wedge 2 is optimized to range from 5° to 15°, which enables rapid self-locking during reverse rotation. Simultaneously, the elastic limiting member 4 provides additional preload, further enhancing the stability of the wedge fit and ensuring rapid response and reliable self-locking of the backstop under dynamic operating conditions. During this process, the double guide rod 5 design of the guide mechanism again plays a role, ensuring that the auxiliary wedge 3 slides along a straight trajectory, avoiding offset problems caused by centrifugal force or vibration.

[0031] Subsequently, when the external transmission components resume normal forward rotation, the secondary wedge block 3 is again subjected to thrust, sliding along the guide rod 5 away from the main wedge block 2, thus releasing the wedge-shaped engagement. The reset device plays a crucial role in this process. The reset spring 8 precisely controls the preload through the adjusting bolt 9, ensuring that the main wedge block 2 can quickly reset in the unlocked state. The adjusting bolt 9 passes through the support seat 10 and is threaded to the base 1. Rotating the adjusting bolt 9 changes the compression of the reset spring 8, thereby achieving precise adjustment of the preload. Positioning rings are provided at both ends of the reset spring 8. The diameter of the positioning rings is slightly larger than the outer diameter of the reset spring 8 to prevent the spring from shifting during compression or tension, ensuring the smoothness and reliability of the reset process.

[0032] Throughout operation, the lubrication system of base 1 injects lubricating oil into the mounting cavity through the oil inlet 11. The lubricating oil evenly covers the key parts of the wedge assembly and guide mechanism, reducing friction and wear between components and extending the service life of the equipment. The lubricating oil is finally discharged as waste oil through the oil drain 12, ensuring the continuous effectiveness of the lubrication system. Furthermore, the limiting baffle 13 and its buffer pad design on the top of base 1 further improve the operational safety of the equipment, preventing mechanical damage caused by overload. The limiting baffle 13 is fixed to the top of base 1 with screws, and its position is precisely designed to ensure that the main wedge 2 and the secondary wedge 3 do not exceed the predetermined range during movement.

[0033] The above steps demonstrate the practical application effect of this invention under high-frequency and high-load conditions. Through the wedge-shaped fit design of the main wedge block 2 and the auxiliary wedge block 3, the double guide rod 5 structure of the guide mechanism, the precise pre-tightening force control of the reset device, and the lubrication system and limit baffle design of the base 1, this invention achieves the technical goals of rapid response, stable self-locking, and long service life, meeting the stringent requirements of industrial transmission systems for contact-type backstops.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A wedge assembly for a contact-type check valve, characterized in that, The system includes a base (1), a wedge assembly, a guide mechanism, and a reset device. The base (1) has an internal mounting cavity, and the wedge assembly is installed in the mounting cavity. The guide mechanism is located on both sides of the wedge assembly, and the reset device is connected to the bottom of the wedge assembly and fixedly connected to the base (1). The wedge assembly includes a main wedge (2), a secondary wedge (3), and an elastic limiting member (4). One side of the main wedge (2) has a sloped structure, which forms a wedge-shaped fit with the mating surface of the secondary wedge (3). The other side of the main wedge (2) has a protrusion, which is embedded in the groove of the base (1) and moves along the groove. The outer side of the secondary wedge (3) has an arc-shaped contact surface. The inner side is provided with a guide groove, which is slidably connected to the guide rod (5) of the guide mechanism. The elastic limiting member (4) is set between the main wedge (2) and the secondary wedge (3). One end of the member is fixed in the groove of the main wedge (2), and the other end abuts against the inner wall of the secondary wedge (3). The guide mechanism includes a guide rod (5), a limiting plate (7), and a friction reducing pad (6). One end of the guide rod (5) is fixed on the inner wall of the base (1), and the other end passes through the guide groove of the secondary wedge (3) and is connected to the limiting plate (7). The friction reducing pad (6) is sleeved on the outside of the guide rod (5) and contacts the inner wall of the guide groove of the secondary wedge (3). There are two guide rods (5), which are respectively set on both sides of the secondary wedge (3).

2. The wedge assembly for a contact-type check valve according to claim 1, characterized in that, The reset device includes a reset spring (8), an adjusting bolt (9), and a support base (10). One end of the reset spring (8) is fixed to the bottom of the main wedge block (2), and the other end is connected to the base (1) through the support base (10). The adjusting bolt (9) passes through the support base (10) and is threadedly connected to the base (1). The outer diameter of the reset spring (8) is smaller than the inner diameter of the support base (10), and positioning rings are provided at both ends of the reset spring (8).

3. A wedge assembly for a contact-type check valve according to claim 1, characterized in that, The base (1) has an oil inlet hole (11) on one side, which is connected to the mounting cavity. The base (1) has an oil drain hole (12) on the other side. The base (1) has a limiting baffle (13) on the top, and a buffer pad is provided on the inner side of the limiting baffle (13).

4. A wedge assembly for a contact-type check valve according to claim 1, characterized in that, The inclined angle of the main wedge (2) ranges from 5° to 15°, and the arc-shaped contact surface of the secondary wedge (3) is hardened to a surface hardness of HRC58 or higher.

5. A wedge assembly for a contact-type check valve according to claim 1, characterized in that, The elastic limiting member (4) is made of fatigue-resistant material with an elastic modulus ranging from 10 GPa to 20 GPa.

6. A wedge assembly for a contact-type check valve according to claim 1, characterized in that, The friction-reducing pad (6) is made of polytetrafluoroethylene.

7. A wedge assembly for a contact-type check valve according to claim 2, characterized in that, The head of the adjusting bolt (9) is provided with a hexagonal groove.

8. A wedge assembly for a contact-type check valve according to claim 3, characterized in that, The limiting baffle (13) is fixed to the top of the base (1) by screws.

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