A pulley hydraulic locking device and pumping unit

Abstract

The present application relates to pumping unit locking technical field, disclose a kind of pulley hydraulic locking device and pumping unit.Locking device includes limiting component, one end is used to extend between the two spokes of pulley;Shell, with limiting component connection;Limiting component can rotate around its axis, and limiting component and shell form cavity, cavity is used to inject hydraulic oil;Wherein, limiting component has first state and second state, when limiting component is located first state, limiting component can rotate relative to shell;When limiting component is located second state, limiting component cannot rotate relative to shell, and limiting component and pulley abut.Pumping unit includes power device and pulley hydraulic locking device.The present application by above-mentioned technical scheme, to solve the technical problem that pulley hydraulic locking device in related art cannot meet the technical problem of reliable, non-impact rigid locking under the condition that pulley is in uncontrolled reverse rotation state at the moment of brake failure.

Description

Technical Field

[0001] This invention relates to the field of oil pumping unit locking technology, and more particularly to a hydraulic locking device for a pulley and an oil pumping unit. Background Technology

[0002] Pumping units are the most common surface machinery in oilfield development. They are the core lifting equipment in rod-operated pumping systems, primarily functioning to convert the rotary motion of an electric motor into reciprocating linear motion. This motion, via the sucker rod, drives the downhole pump, continuously drawing crude oil from underground to the surface. The working principle involves a power unit driving a crankshaft via a reducer, which, through connecting rods and a walking beam mechanism, converts the rotary motion into the up-and-down oscillation of the pump head, ultimately driving the pump plunger in a reciprocating motion to complete oil extraction.

[0003] After the pumping unit completes its braking operation, the hydraulic locking device of the pulley precisely engages with the gap between the pulley spokes, achieving a rigid mechanical lock on the pulley. This locking mechanism operates independently of the braking system, effectively restraining the pulley's rotation even if the braking system completely fails, cutting off the power transmission path, and preventing the pumping unit from operating unexpectedly, thus completely eliminating the risk of mechanical injury during maintenance. However, if the pumping unit experiences brake failure during the braking phase, the existing hydraulic locking device cannot meet the requirement of reliable, shock-free rigid locking at the moment of brake failure when the pulley is in an uncontrolled reverse motion. Summary of the Invention

[0004] This application discloses a hydraulic locking device for a pulley and an oil pump, in order to solve the technical problem that the hydraulic locking device for a pulley in the related art cannot satisfy the requirement of reliable and impact-free rigid locking at the moment of brake failure and when the pulley is in an uncontrolled reverse motion state.

[0005] To solve the above problems, the present invention adopts the following technical solution: In a first aspect, this application discloses a hydraulic locking device for a pulley, comprising: A limiting component, one end of which is used to extend between the two spokes of a pulley; The housing is connected to the limiting assembly; the limiting assembly can rotate about its axis, and the limiting assembly and the housing form a cavity for injecting hydraulic oil; The limiting component has a first state and a second state. When the limiting component is in the first state, the limiting component can rotate relative to the housing. When the limiting component is in the second state, the limiting component cannot rotate relative to the housing, and the limiting component abuts against the pulley. The limiting component is configured to switch from the first state to the second state under the hydraulic pressure of hydraulic oil.

[0006] In some designs, the limiting assembly includes a connector and a stop, the connector being connected to the housing and forming a cavity therebetween; the connector is rotatable about its axis and one end is for extending between the two spokes of the pulley; The stop member is connected to the connecting member. When the limiting component is in the first state, the stop member is separated from the inner wall of the housing. When the limiting component is in the second state, the stop member abuts against the inner wall of the housing. The connecting member can also move along its axis under the hydraulic pressure of hydraulic oil to switch the limiting component from the first state to the second state.

[0007] In some designs, the connector includes a connecting portion, a first rod, and a second rod. The connecting portion forms a cavity with the housing. One end of the first rod is axially connected to one end of the connecting portion, and the other end is fitted into the housing. One end of the second rod is axially connected to the other end of the connecting portion, and the other end extends between the two spokes. A stopper is connected to the connecting portion.

[0008] In some designs, the stop element includes a frame and multiple stop blocks. The frame is connected to the housing, and the multiple stop blocks are respectively connected to the connecting part and the frame. The stop blocks can move circumferentially along the frame and radially along the frame. The inner wall of the housing has multiple slots, and the connecting part moves under the hydraulic pressure of the hydraulic oil, causing the stop block to be embedded in the slot.

[0009] In some designs, the frame has a first groove extending circumferentially, and the stop block has a second groove extending radially, the second groove being fitted into a pin, and the pin being fitted into the first groove.

[0010] In some designs, the circumferential wall of the connecting part has a first wedge-shaped surface, and the first wedge-shaped surface is provided with a plurality of third sliding grooves along the circumference of the connecting part. The stop block has a second wedge-shaped surface that mates with the first wedge-shaped surface and is embedded in the third sliding groove.

[0011] In some designs, the inner wall of the housing has multiple internal teeth, and a groove is formed between any two adjacent internal teeth. The outer wall of the stop block has multiple external teeth. When the limiting component is in the second state, the external teeth mesh with the internal teeth.

[0012] In some designs, the housing has a first protrusion with a through hole extending along its axial direction, and the first rod is fitted into the first protrusion.

[0013] In some designs, the end of the connecting part axially away from the first rod has several second protrusions. When the limiting assembly is in the second state, the second protrusions are located between the two spokes of the pulley and abut against the two spokes respectively. And / or, the circumferential wall of the connecting part is provided with a plurality of equidistantly arranged third protrusions; And / or, the second rod is detachably connected to the connecting part.

[0014] Secondly, this application also discloses an oil pumping unit, including a power unit and the pulley hydraulic locking device mentioned in the first aspect. The power unit includes a pulley, and the pulley hydraulic locking device is provided corresponding to the pulley.

[0015] The technical solution adopted in this invention can achieve the following beneficial effects: The hydraulic locking device for a pulley disclosed in this application has a limiting component that extends one end into the space between two spokes of the pulley, connecting to the housing and forming a cavity into which hydraulic oil can be injected. During normal operation, the limiting component is in a first state, freely rotating relative to the housing around its axis and moving synchronously with the pulley without causing hard interference. When locking is required, hydraulic oil is injected into the cavity, and under hydraulic pressure, the limiting component switches to a second state. In this second state, the limiting component cannot rotate relative to the housing and forms a rigid stop with the pulley. The advantages are: the limiting component can safely intervene in the gap between the pulley spokes in the first state beforehand, and then the state switch is completed by hydraulic pressure, avoiding rigid impact with the moving spokes while reliably locking the pulley when needed, achieving a balance between impact-free intervention and rigid locking. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an isometric view of a hydraulic locking device for a pulley disclosed in some embodiments of this application; Figure 2 This is a top view of a hydraulic locking device for a pulley disclosed in some embodiments of this application; Figure 3 yes Figure 2 A sectional view of plane aa in the middle; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 This is the isometric view of the limiting component disclosed in some embodiments of this application. Figure 1 ; Figure 6 yes Figure 5 Enlarged view of point B in the middle; Figure 7 This is the isometric view of the limiting component disclosed in some embodiments of this application. Figure 2 ; Figure 8 These are isometric views of pulleys disclosed in some embodiments of this application; Figure 9 This is a front view of an oil pumping unit disclosed in some embodiments of this application.

[0018] In the picture: 100-Pulley hydraulic locking device, 110-Limiting component, 111-Connector, 1111-Connecting part, 1112-First rod, 1113-Second rod, 1114-First wedge surface, 1115-Third slide groove, 1116-Second protrusion, 1117-Third protrusion, 112-Stop, 1121-Frame, 1122-Stop block, 1123-First slide groove, 1124-Second slide groove, 1125-Pin, 1126-Second wedge surface, 1127-External tooth, 120-Housing, 121-Cavity, 122-Internal tooth, 123-First protrusion, 1231-Hole; 200 - Oil pumping unit, 210 - Pulley, 211 - Spoke. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] During their research on oil pumping units, the inventors discovered that existing hydraulic pulley locking devices cannot reliably and without impact provide rigid locking in the event of brake failure during the braking phase, especially when the pulley is in an uncontrolled reverse motion. The reason is that existing hydraulic pulley locking devices operate on the premise of "first completing braking, and then statically engaging the U-shaped locking block with the spoke gap after the pulley has come to a complete stop." When the brake suddenly fails during deceleration, the enormous elastic potential energy stored in the sucker rod is released instantaneously, driving the pulley into a high-speed, uncontrolled reverse impact motion. If the device attempts to lock at this point, the locking block will be forced into dynamic engagement with the rapidly reversing spokes, inevitably causing a violent mechanical impact. This not only fails to achieve "impact-free" locking but also results in the locking block failing to engage accurately, being ejected, or even breaking due to the immense impact energy, thus completely losing its rigid constraint capability and failing to prevent the oil pumping unit from operating unexpectedly.

[0022] The following is in conjunction with the appendix Figures 1 to 9 The present application provides a detailed description of a belt pulley hydraulic locking device 100 and an oil pumping unit 200 through specific embodiments and application scenarios.

[0023] Some embodiments of this application disclose a hydraulic locking device 100 for a pulley, including a limiting component 110 and a housing 120.

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, one end of the limiting component 110 is used to extend between the two spokes 211 of the pulley 210; the housing 120 is connected to the limiting component 110; the limiting component 110 can rotate around its axis, and the limiting component 110 and the housing 120 form a cavity 121, which is used to inject hydraulic oil. The limiting component 110 extends between the two spokes 211 of the pulley 210 at one end, and the pulley 210 drives the limiting component 110 to rotate synchronously when rotating, without hard interference with the spokes 211; during the braking phase, hydraulic oil is gradually injected into the cavity 121 formed by the housing 120 and the limiting component 110, and the viscosity of the hydraulic oil gradually prevents the limiting component 110 from rotating relative to the housing 120, thus assisting the braking system in braking the pumping unit 200 to a certain extent.

[0025] Specifically, pulleys such as Figure 8 As shown.

[0026] In this embodiment, the housing 120 is fixed to the ground, or the housing 120 is connected to the support frame of the pumping unit 200.

[0027] In this embodiment, the housing 120 has an oil inlet and an oil outlet corresponding to the cavity 121.

[0028] The limiting component 110 has a first state and a second state. When the limiting component 110 is in the first state, it can rotate relative to the housing 120. When the limiting component 110 is in the second state, it cannot rotate relative to the housing 120, and it abuts against the pulley 210. The limiting component 110 is configured to switch from the first state to the second state under the hydraulic pressure of hydraulic oil. After the brake is fully applied, the pulley 210 is stationary. At this time, the limiting component 110 can be pre-extended between the two spokes 211 of the pulley 210 in the first state, and then switched from the first state to the second state under the hydraulic pressure of hydraulic oil, forming a rigid abutment with the pulley 210, thereby achieving a static rigid mechanical lock on the pulley 210. When a sudden situation occurs where the brake fails during the braking phase, the elastic potential energy stored in the sucker rod string is released instantaneously, driving the pulley 210 into an uncontrolled reverse motion state. At this time, if the limiting component 110 is already in the first state and extends between the spokes 211, it can rotate synchronously with the pulley 210 without hard interference with the spokes 211. On this basis, the limiting component 110 switches from the first state to the second state under the hydraulic pressure of the hydraulic oil, and cannot rotate relative to the housing 120, and stops against the pulley 210, thereby achieving rigid locking when the pulley 210 is in the uncontrolled reverse motion state, preventing the pumping unit 200 from operating unexpectedly.

[0029] like Figure 3 , Figure 5 and Figure 7 As shown, the limiting assembly 110 includes a connector 111 and a stop member 112. The connector 111 is connected to the housing 120, forming a cavity 121 between them. The connector 111 is rotatable about its axis, and one end is used to extend between the two spokes 211 of the pulley 210. The connector 111 is rotatable about its axis, and one end extends between the two spokes 211 of the pulley 210. When the pulley 210 rotates, it is driven to rotate synchronously, avoiding hard interference with the spokes 211. At the same time, the cavity 121 formed between the connector 111 and the housing 120 is used to accommodate hydraulic oil, providing a structural basis for the stop member 112 to perform the stop action under the hydraulic pressure of the hydraulic oil.

[0030] like Figure 3 , Figure 5 and Figure 7As shown, the stop member 112 is connected to the connecting member 111. When the limiting component 110 is in the first state, the stop member 112 is separated from the inner wall of the housing 120. When the limiting component 110 is in the second state, the stop member 112 abuts against the inner wall of the housing 120. The connecting member 111 can also move along its axis under the hydraulic pressure of hydraulic oil, so that the limiting component 110 switches from the first state to the second state. The stop member 112 is connected to the connecting member 111. When the limiting component 110 is in the first state, the stop member 112 is separated from the inner wall of the housing 120, ensuring that the connecting member 111 can rotate freely around its axis. When locking is required, the connecting member 111 moves along its axis under the hydraulic pressure of hydraulic oil, causing the stop member 112 to press against the inner wall of the housing 120 to form a stop, so that the limiting component 110 switches to the second state, realizing a reliable locking that prevents relative rotation.

[0031] like Figure 3 , Figure 5 and Figure 7 As shown, the connector 111 includes a connecting part 1111, a first rod 1112, and a second rod 1113. The connecting part 1111 and the housing 120 form a cavity 121. One end of the first rod 1112 is connected to one axial end of the connecting part 1111, and the other end is connected to the housing 120. One end of the second rod 1113 is connected to the other axial end of the connecting part 1111, and the other end extends between the two spokes 211. The stop member 112 is connected to the connecting part 1111. The connecting part 1111 and the housing 120 form a cavity 121 for accommodating hydraulic oil. The first rod 1112 is connected to the housing 120 to provide support for the connecting member 111 to rotate around its axis. One end of the second rod 1113 extends between the two spokes 211 and is driven to rotate synchronously when the pulley 210 rotates. The stop member 112 is connected to the connecting part 1111 so that when the connecting member 111 moves along its axis under the hydraulic pressure, it can directly drive the stop member 112 to move, realizing the reliable switching of the limiting component 110 from the first state to the second state.

[0032] like Figure 3 , Figure 4 , Figure 5 and Figure 7As shown, the stop member 112 includes a frame 1121 and multiple stop blocks 1122. The frame 1121 is connected to the housing 120, and the multiple stop blocks 1122 are respectively connected to the connecting part 1111 and the frame 1121. The stop blocks 1122 can move circumferentially and radially along the frame 1121. The inner wall of the housing 120 has multiple slots. The connecting part 1111 moves under the hydraulic pressure of hydraulic oil, causing the stop blocks 1122 to be embedded in the slots. When the limiting component 110 is in the first state, the stop blocks 1122 are separated from the slots on the inner wall of the housing 120, and the connecting part 111 can rotate freely around its axis. When switching to the second state is required, hydraulic oil is injected into cavity 121, and the hydraulic pressure drives the connecting part 1111 to move along its axis. The movement of the connecting part 1111 directly acts on the stop block 1122, forcing the stop block 1122 to move radially outward along the frame 1121 to approach the inner wall of the housing 120. Finally, under the push of the connecting part 1111, the stop block 1122 is precisely embedded in multiple slots on the inner wall of the housing 120, forming a rigid fit, so that the limiting component 110 cannot rotate relative to the housing 120, completing the switch from the first state to the second state. The axial movement of the connecting part 1111 is transformed into a circumferential and radial composite movement of the stop block 1122 through the cooperation between the stop block 1122 and the frame 1121, realizing the precise fit between the stop block 1122 and the slots. Multiple stop blocks 1122 are simultaneously embedded in multiple slots, forming a multi-point synchronous locking mechanical structure. This ensures a uniform distribution of locking force, significantly enhancing the load-bearing capacity and impact resistance of the limiting component 110 in the second state. The rigid engagement of the stop blocks 1122 with the slots is a form-locked connection, whose reliability is far superior to friction locking. It can effectively withstand the enormous impact torque of the pulley 210 in the uncontrolled reverse motion state, ensuring that the locked state will not slip or fail due to impact.

[0033] like Figure 5 and Figure 6As shown, the frame 1121 has a first groove 1123 extending circumferentially, and the stop block 1122 has a second groove 1124 extending radially. The second groove 1124 is fitted into a pin 1125, and the pin 1125 is fitted into the first groove 1123. Through the first groove 1123 extending circumferentially on the frame 1121 and the second groove 1124 extending radially on the stop block 1122, and with the cross-guide constraint formed by the pin 1125 being simultaneously fitted into the first groove 1123 and the second groove 1124, the movement of the stop block 1122 is precisely limited to a composite movement of two degrees of freedom, circumferential and radial, along the frame 1121. When the connecting part 1111 moves along its axis under the hydraulic pressure and pushes the stop block 1122, the stop block 1122 is guided circumferentially by the pin 1125 in the first slide groove 1123 and radially by the second slide groove 1124 relative to the pin 1125. This allows the stop block 1122 to move smoothly and steadily from the separated position to the engaged position along a preset trajectory, preventing the stop block 1122 from deflecting or getting stuck during movement. This guiding method ensures that multiple stop blocks 1122 can be synchronously and accurately embedded into multiple corresponding slots on the inner wall of the housing 120, achieving multi-point uniform locking and significantly improving the reliability and locking rigidity of the limiting component 110 when switching from the first state to the second state.

[0034] like Figure 3 and Figure 4 As shown, the circumferential wall of the connecting portion 1111 has a first wedge-shaped surface 1114. The first wedge-shaped surface 1114 is provided with a plurality of third sliding grooves 1115 along the circumference of the connecting portion 1111. The stop block 1122 has a second wedge-shaped surface 1126 that mates with the first wedge-shaped surface 1114 and is embedded in the third sliding groove 1115. The first wedge-shaped surface 1114 on the circumferential wall of the connecting portion 1111 provides a driving ramp for the stop block 1122; the plurality of third sliding grooves 1115 are distributed along the circumference of the connecting portion 1111, providing a basis for the installation and movement guidance of the stop block 1122. The stop block 1122 mates with the first wedge-shaped surface 1114 through its second wedge-shaped surface 1126 and is embedded in the third sliding groove 1115, thus forming a wedge-shaped sliding pair between the stop block 1122 and the connecting portion 1111. When the limiting assembly 110 needs to switch from the first state to the second state, hydraulic oil is injected into the cavity 121, and the hydraulic pressure drives the connecting part 1111 to move along its axis. The axial movement of the connecting part 1111 causes the first wedge surface 1114 to slide relative to the second wedge surface 1126 of the stop block 1122. Due to the slope of the wedge surface, the axial movement of the connecting part 1111 is converted into a radial outward movement component of the stop block 1122 along the connecting part 1111, forcing the stop block 1122 to move outward along the guide direction of the third slide groove 1115.

[0035] The engagement of the first wedge surface 1114 and the second wedge surface 1126 amplifies the axial driving force of the connecting part 1111 through the inclined plane principle and converts it into the radial clamping force of the stop block 1122, achieving efficient force transmission and amplification. This allows for the generation of a large embedding force of the stop block 1122 even under limited hydraulic oil pressure. Multiple third grooves 1115 are distributed circumferentially along the connecting part 1111, ensuring that multiple stop blocks 1122 can be simultaneously subjected to force and move synchronously, achieving multi-point uniform locking and preventing the failure of a single stop block 1122 due to uneven force distribution. Simultaneously, the third grooves 1115 provide circumferential positioning for the stop blocks 1122 along the connecting part 1111, preventing the stop blocks 1122 from swaying or disengaging during the wedge-face pushing process, ensuring smooth movement and accurate engagement positioning.

[0036] like Figure 4 and Figure 6 As shown, the inner wall of the housing 120 has multiple internal teeth 122, and a groove is formed between any two adjacent internal teeth 122. The outer wall of the stop block 1122 has multiple external teeth 1127. When the limiting component 110 is in the second state, the external teeth 1127 engage with the internal teeth 122. The multiple internal teeth 122 distributed on the inner wall of the housing 120 naturally form a groove between any two adjacent internal teeth 122, providing the stop block 1122 with dense, uniformly distributed rigid engagement points along the circumference. The multiple external teeth 1127 on the outer wall of the stop block 1122 can achieve multi-tooth synchronous engagement with the internal teeth 122 on the inner wall of the housing 120 when the limiting component 110 switches from the first state to the second state. Multi-tooth meshing provides automatic centering and guidance. As the stop block 1122 moves along the frame 1121 towards the inner wall of the housing 120, the tooth tips of the outer teeth 1127 slide into the tooth groove along the inclined surface of the inner teeth 122. Even if there is a slight circumferential deviation between the stop block 1122 and the groove, it can be automatically corrected and guided to the accurate meshing position, improving the smoothness of state switching and the fault tolerance of the action. The densely distributed inner teeth 122 provide more locking angle positions, so that when the pulley 210 stops at any rotation angle, the limiting component 110 can find the corresponding groove for reliable locking, reducing the dependence on the specific angle of the pulley 210.

[0037] like Figure 3As shown, the housing 120 has a first protrusion 123, which has a hole 1231 extending through it along its axial direction. A first rod 1112 is embedded in the first protrusion 123. The hole 1231 of the first protrusion 123 provides both circumferential rotational support and axial sliding guidance for the first rod 1112. In the first state, the first rod 1112 can rotate flexibly within the hole 1231, ensuring that the connecting member 111 rotates synchronously with the pulley 210. When the hydraulic oil drives the connecting member 1111 to move axially, the first rod 1112 slides smoothly along the hole 1231, providing precise guidance for the state switching of the limiting assembly 110.

[0038] like Figure 1 , Figure 5 and Figure 7 As shown, the end of the connecting part 1111 axially away from the first rod 1112 has several second protrusions 1116. When the limiting component 110 is in the second state, the second protrusions 1116 are located between the two spokes 211 of the pulley 210 and abut against the two spokes 211 respectively. When the limiting component 110 is in the second state, the several second protrusions 1116 abut against the two spokes 211 respectively, realizing the bidirectional rigid constraint between the limiting component 110 and the pulley 210 in the circumferential direction. This ensures that no matter whether the pulley 210 is subjected to a positive or negative torque, the second protrusions 1116 can reliably abut against the spokes 211, effectively preventing the pulley 210 from rotating relative to the limiting component 110 and ensuring the stability and reliability of the locked state.

[0039] like Figure 3 , Figure 5 and Figure 7 As shown, the circumferential wall of the connecting part 1111 is provided with a plurality of equally spaced third protrusions 1117. The plurality of equally spaced third protrusions 1117 increase the contact area between the connecting part 1111 and the hydraulic oil in the cavity 121. When the limiting component 110 is in the first state and the hydraulic oil is injected into the cavity 121, the rotating connecting part 1111 drives the third protrusions 1117 to stir in the hydraulic oil, which significantly increases the viscous resistance of the hydraulic oil to the circumferential rotation of the connecting part 1111, making the rotation of the connecting part 1111 more laborious, thereby more effectively assisting the braking system to brake and decelerate the pulley 210 during the braking phase.

[0040] The second rod 1113 is detachably connected to the connecting part 1111. The detachable connection between the second rod 1113 and the connecting part 1111 facilitates individual replacement when the end of the second rod 1113 wears or deforms due to long-term contact with the spokes 211, thus reducing maintenance costs.

[0041] Some embodiments of this application also provide an oil pumping unit 200, including a power unit and a pulley hydraulic locking device 100.

[0042] like Figure 8 and Figure 9 As shown, the power unit includes a pulley 210, and a hydraulic locking device 100 is provided corresponding to the pulley 210. By integrating the hydraulic locking device 100 into the pumping unit 200 and providing it to the pulley 210, the pumping unit 200 itself possesses a rigid mechanical locking capability independent of the braking system. This achieves reliable constraint on the pulley 210 during maintenance operations at the whole-machine level, eliminating the safety hazard of unexpected operation of the pumping unit 200 due to brake failure.

[0043] Specifically, the power unit also includes a motor, another pulley 210 and a belt, with the belt sleeved between the two pulleys 210, and the output shaft of the motor connected to the other pulley 210.

[0044] Specifically, the pumping unit 200 also includes a reducer, a crank, and a walking beam. The pulley 210 is connected to the input end of the reducer, and the output end of the reducer is connected to the walking beam through the crank, thereby transmitting the power of the motor to the walking beam and driving the walking beam to swing.

[0045] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0046] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0047] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A hydraulic locking device for a pulley, characterized in that, include: A limiting component, one end of which is used to extend between the two spokes of a pulley; A housing is connected to the limiting component; the limiting component is rotatable about its axis, and the limiting component and the housing form a cavity for injecting hydraulic oil; The limiting component has a first state and a second state. When the limiting component is in the first state, it can rotate relative to the housing. When the limiting component is in the second state, it cannot rotate relative to the housing, and it abuts against the pulley. The limiting component is configured to switch from the first state to the second state under the hydraulic pressure of hydraulic oil.

2. The hydraulic locking device for a pulley according to claim 1, characterized in that, The limiting component includes a connector and a stop member. The connector is connected to the housing and forms a cavity between the connector and the housing. The connector is rotatable about its axis, and one end is used to extend between the two spokes of the pulley. The stop member is connected to the connector. When the limiting component is in the first state, the stop member is separated from the inner wall of the housing. When the limiting component is in the second state, the stop member abuts against the inner wall of the housing. The connector can also move along its axis under the hydraulic pressure of hydraulic oil to switch the limiting component from the first state to the second state.

3. The hydraulic locking device for a pulley according to claim 2, characterized in that, The connector includes a connecting part, a first rod, and a second rod. The connecting part and the housing form the cavity. One end of the first rod is connected to one axial end of the connecting part, and the other end is connected to the housing. One end of the second rod is connected to the other axial end of the connecting part, and the other end extends between the two spokes. The stop member is connected to the connecting part.

4. A hydraulic locking device for a pulley according to claim 3, characterized in that, The stop member includes a frame and a plurality of stop blocks. The frame is connected to the housing, and the plurality of stop blocks are respectively connected to the connecting part and the frame. The stop blocks can move circumferentially along the frame and radially along the frame. The inner wall of the housing has multiple slots, and the connecting part moves under the hydraulic pressure of hydraulic oil, causing the stop block to be embedded in the slots.

5. A hydraulic locking device for a pulley according to claim 4, characterized in that, The frame has a first groove extending circumferentially, and the stop block has a second groove extending radially, the second groove being fitted into a pin, and the pin being fitted into the first groove.

6. A hydraulic locking device for a pulley according to claim 4, characterized in that, The circumferential wall of the connecting part has a first wedge-shaped surface, and the first wedge-shaped surface is provided with a plurality of third sliding grooves along the circumference of the connecting part. The stop block has a second wedge-shaped surface that mates with the first wedge-shaped surface and is embedded in the third sliding groove.

7. A hydraulic locking device for a pulley according to claim 4, characterized in that, The inner wall of the housing has multiple internal teeth, and the groove is formed between any two adjacent internal teeth. The outer wall of the stop block has multiple external teeth. When the limiting component is in the second state, the external teeth engage with the internal teeth.

8. A hydraulic locking device for a pulley according to claim 3, characterized in that, The housing has a first protrusion with a hole extending through it along its axial direction, and the first rod is embedded in the first protrusion.

9. A hydraulic locking device for a pulley according to claim 3, characterized in that, The connecting part has a plurality of second protrusions at one end axially away from the first rod. When the limiting component is in the second state, the second protrusions are located between the two spokes of the pulley and abut against the two spokes respectively. And / or, the circumferential wall of the connecting part is provided with a plurality of equally spaced third protrusions; And / or, the second rod is detachably connected to the connecting part.

10. An oil pumping unit, characterized in that, The device includes a power unit and a hydraulic locking device for a pulley as described in any one of claims 1-9, wherein the power unit includes a pulley and the hydraulic locking device for the pulley is provided corresponding to the pulley.

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