Oil pumping unit brake device

Abstract

The utility model belongs to the field of actuating mechanisms for brakes, and particularly relates to a pumping unit dead brake device. In order to conveniently and safely release a dead brake, the utility model provides a dead brake device of an oil pumping unit. The oil pumping unit dead brake device comprises a hook body, a direct-acting driving mechanism, a force application rod, a movable arm, a clamping piece and a guide rod, a sliding hole is formed in one end of the hook body in the length direction, the clamping piece is located in the sliding hole and used for clamping a dead brake shaft together with the inner wall of the sliding hole, one end of the movable arm is hinged to the hook body, and the other end of the movable arm is provided with a shifting fork used for moving the guide rod upwards. The force application rod penetrates through a gap between the movable arm and the hook body, the direct-acting driving mechanism is used for driving the force application rod to move up and down, the guide rod is fixedly connected with the clamping piece, the guide rod is matched with the hook body in a guiding and moving mode, and the guide rod is further sleeved with a compression spring used for applying downward elastic force to the clamping piece. The direct-acting driving mechanism drives the force applying rod to ascend so as to directly release the dead brake, and operation is convenient and safe.

Description

Technical Field

[0001] This utility model belongs to the field of actuation mechanisms for brakes, and in particular relates to a dead brake device for an oil pumping unit. Background Technology

[0002] When overhauling a beam pumping unit, the machine must be stopped and braked, and the dead brake safety hook must be lowered into the dovetail groove of the dead brake wheel. In the event of slippage or other phenomena in the beam pumping unit, the dead brake safety hook will form a rigid brake with the dead brake wheel and lock the beam pumping unit, ensuring that no safety accidents occur during maintenance.

[0003] For example, Chinese invention patent with authorization announcement number CN113309802B and authorization announcement date of September 13, 2024 discloses a self-unlocking pumping unit dead brake safety hook, which includes a hook body and a limit screw.

[0004] One end of the hook body has a trapezoidal locking block for falling into the dovetail groove of the brake wheel during dead braking, and the other end of the hook body has a sliding hole for the brake shaft to pass through. The brake shaft is fixedly connected to the gearbox of the pumping unit. The sliding hole includes a horizontal smooth hole and a semi-circular hole. The semi-circular hole is connected to the lower end of the middle of the horizontal smooth hole. The limit screw is threaded on the hook body and forms a set screw for pressing the brake shaft.

[0005] During the dead braking, the trapezoidal block falls into the dovetail groove of the dead brake wheel, the dead brake shaft passes through the sliding hole and is partially located in the semi-circular hole, and the limit screw and the groove wall of the semi-circular hole together clamp the dead brake shaft.

[0006] To release the brake, first, reverse the rotation of the limit screw to separate it from the brake shaft. Then, wiggle the hook body up and down to disengage the brake shaft from the semi-circular hole and into the horizontal aperture. Finally, move the hook body horizontally to create sufficient clearance between the trapezoidal block and the side wall of the dovetail groove, thus unlocking the trapezoidal block and allowing it to be moved out of the dovetail groove, thereby releasing the brake. During the horizontal movement of the hook body, since the brake shaft remains stationary, the relative position of the brake shaft and the horizontal aperture changes. The horizontal aperture prevents interference between the hook body and the brake shaft.

[0007] Regarding the aforementioned pumping unit dead brake safety hook, during the process of releasing the dead brake, workers need to climb to a small platform on top of the pumping unit and perform the operation of turning the limit screw and moving the hook body on the small platform. On the one hand, the operation is relatively troublesome, and on the other hand, there is a risk of workers falling from a height, making the risk factor high. Utility Model Content

[0008] The purpose of this utility model is to provide a pumping unit dead brake device to solve the technical problem that the operation is troublesome and dangerous due to the need for workers to climb to heights when releasing the dead brake.

[0009] To achieve the above objectives, the technical solution of the oil pumping unit dead braking device provided by this utility model is as follows:

[0010] A pumping unit dead brake device includes a hook body, one end of which is provided with a trapezoidal block in the length direction, and the other end is provided with a sliding hole for the dead brake shaft to pass through. It also includes a direct drive mechanism, a force-applying rod, a movable arm, a clamping member, and a guide rod.

[0011] The direct drive mechanism includes an output end capable of moving vertically up and down, and a force-applying rod extending horizontally and connected to the output end of the direct drive mechanism;

[0012] The end of the movable arm near the trapezoidal block is hinged to the hook body, and the other end is equipped with a fork. The force-applying rod passes through the gap between the movable arm and the hook body.

[0013] The clamping member is disposed in the sliding hole, and the end of the clamping member used to approach the dead brake shaft has a first arc-shaped groove with a hole diameter that matches the outer diameter of the dead brake shaft;

[0014] The hook body is provided with a guide hole, the guide rod passes through the guide hole and is guided and engaged with the guide hole, and one end of the guide rod is fixedly connected to the clamping part;

[0015] The guide rod has a protrusion on its outer circumference. The shift fork is used to cooperate with the protrusion to lift the guide rod under the action of the force rod. A compression spring for pressing down on the clamping member is fitted on the guide rod. The compression spring is installed between the clamping member and the wall of the sliding hole. Alternatively, the hook body includes a compression spring mounting beam located above the protrusion. The compression spring is pressed between the side of the protrusion away from the shift fork and the compression spring mounting beam.

[0016] Furthermore, along the length of the hook body, the sliding hole near the inner wall of the trapezoidal block or the first arc groove near the groove wall of the trapezoidal block constitutes an upper unlocking limit part, and the sliding hole away from the inner wall of the trapezoidal block or the first arc groove away from the groove wall of the trapezoidal block constitutes a lower unlocking limit part. Each unlocking limit part satisfies the following condition: when the dead brake shaft is engaged with the corresponding unlocking limit part, the trapezoidal block and the dovetail groove of the dead brake wheel are unlocked.

[0017] Furthermore, the hook body is provided with a mounting groove, in which a locking tongue is installed for cooperating with the shift fork. A return spring is provided between the locking tongue and the bottom wall of the mounting groove. The shift fork has an unlocking position located below the locking tongue and a locking position located above the locking tongue and cooperating with the locking tongue in the up-down direction.

[0018] Furthermore, a hinge shaft is connected to the hook body, and a hinge hole is provided on the movable arm. The hinge shaft passes through the hinge hole to realize the hinge between the hook body and the movable arm. The hinge hole is an elongated hole extending along the length of the hook body, and the length of the elongated hole satisfies the following conditions: when the hinge shaft is located at the end of the elongated hole close to the trapezoidal block, the fork has the unlocking position and the locking position; when the hinge shaft is located at the end of the elongated hole away from the trapezoidal block, the locking tongue and the fork are unlocked.

[0019] Furthermore, the sliding hole is a rectangular sliding hole.

[0020] Furthermore, the sliding hole has a second arc-shaped groove on its wall, and the groove wall of the second arc-shaped groove is used to cooperate with the groove wall of the first arc-shaped groove to clamp the dead brake shaft.

[0021] Furthermore, a groove is provided on the side wall of the movable arm near the force-applying rod, and the force-applying rod passes through the gap between the groove wall and the hook body.

[0022] Furthermore, one end of the guide rod is provided with an external thread, and the clamping component is provided with a corresponding threaded hole, and the guide rod is threadedly connected to the clamping component.

[0023] Furthermore, the clamping element is a clamping block.

[0024] Furthermore, the direct drive mechanism is a linear motor for mounting on the gearbox of the pumping unit.

[0025] The beneficial effects of the oil pumping unit dead brake device provided by this utility model are as follows: This utility model is an improved invention. The main difference between this utility model and the prior art is that in the prior art, the dead brake shaft is unlocked by manually turning the limiting screw and the dead brake is released by manually moving the hook body; while in this utility model, the dead brake is released by the external power output of the direct drive mechanism and the weight of the hook body itself.

[0026] To facilitate understanding by those skilled in the art, the beneficial effects of the oil pumping unit brake device of this utility model will be described in detail below in conjunction with specific usage.

[0027] During the dead braking operation, the trapezoidal block falls into the dovetail groove of the dead brake wheel and engages with the groove wall of the dovetail groove. Under the action of the compression spring, the clamping part engages with the inner wall of the perforation to clamp the dead brake shaft, thereby preventing the hook body from moving and ensuring that the trapezoidal block locks the dead brake wheel.

[0028] When the brakes need to be released, the operator only needs to control the output end of the direct drive mechanism (such as a linear motor, direct hydraulic cylinder, or direct pneumatic cylinder) to move upward using a remote control or on-site operation buttons. How to control the output end of the direct drive mechanism to move upward is existing technology and will not be described in detail here.

[0029] When the brake wheel is stuck clockwise (i.e., the brake shaft cannot rotate clockwise), the force lever also moves upward during the upward movement of the output end. The chain reaction caused by the upward movement of the force lever is as follows:

[0030] The force lever moves upward and pushes the movable arm upward. Since one end of the movable arm is hinged to the fixed hook body, the force lever will drive the shift fork at the other end of the movable arm to tilt upward. The shift fork cooperates with the protrusion to drive the guide rod and the clamping member to move obliquely upward. The first arc groove on the clamping member disengages from the dead brake shaft.

[0031] After the first arc-shaped groove disengages from the dead brake shaft, the dovetail groove of the dead brake wheel and the trapezoidal locking block form the first fulcrum, and the contact point between the force-applying rod and the movable arm forms the second fulcrum. Under the influence of the first and second fulcrums, the hook body moves diagonally downward along its own length under its own weight.

[0032] It should be noted that during the process of the hook body moving diagonally downward, whenever the hook body moves diagonally downward by a small displacement, the first fulcrum will temporarily disappear. Under the influence of the single-point support of the second fulcrum, the hook body will rotate clockwise due to its own rotation until the trapezoidal block contacts the dovetail groove to form a new first fulcrum.

[0033] After that, the lever continues to move upward, causing the trapezoidal locking block to rotate out of the dovetail groove, thus releasing the dead brake.

[0034] Similarly, when the brake wheel is stuck counterclockwise (i.e., the brake shaft cannot rotate counterclockwise), during the upward movement of the output end, the force lever also moves upward. The chain reaction caused by the upward movement of the force lever is as follows:

[0035] The force lever moves upward and pushes the movable arm upward. Since one end of the movable arm is hinged to the fixed hook body, the force lever will drive the shift fork at the other end of the movable arm to tilt upward. The shift fork cooperates with the protrusion to drive the guide rod and the clamping member to move obliquely upward. The first arc groove on the clamping member disengages from the dead brake shaft.

[0036] Afterward, the force bar continues to move upward. At this time, the groove wall of the dovetail groove is used to support the trapezoidal block, thereby supporting the hook body. Therefore, the hook body will not move diagonally downward.

[0037] After the lever continues to move upward a certain distance, the force exerted by the lever on the movable arm is sufficient to move the hook body upward. Afterward, the lever continues to move upward, and the hook body moves diagonally upward. After the hook body moves a small displacement diagonally upward, the wall of the dovetail groove separates from the trapezoidal block, so the hook body rotates under its own weight until the trapezoidal block contacts the wall of the dovetail groove again.

[0038] After that, the lever continues to move upward, causing the trapezoidal locking block to rotate out of the dovetail groove, thus releasing the dead brake.

[0039] In summary, after using the pumping unit dead brake device of this utility model, the dead brake can be released simply by moving the output end of the direct drive mechanism upward. It is easy to operate, and the staff does not need to work at height, resulting in a high safety factor. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the oil pumping unit dead braking device of this utility model during dead braking;

[0041] Figure 2 for Figure 1 Schematic diagram of the middle hook body;

[0042] Figure 3 for Figure 1 Schematic diagram of the structure of the central locking tongue;

[0043] Figure 4 for Figure 1 Schematic diagram of the movable arm;

[0044] Figure 5 This is a schematic diagram of the structure of the oil pumping unit dead brake device in Embodiment 1 of this utility model when the dead brake is released;

[0045] Figure 6 This is a schematic diagram of the structure when the dead brake is released in Embodiment 2 of the oil pumping unit dead brake device of this utility model.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Brake wheel; 2. Linear motor; 3. Brake shaft; 4. Hook body; 4-1. Trapezoidal block; 4-2. Pin hole; 4-3. Compression spring mounting beam; 4-4. Guide hole; 4-5. Sliding hole; 4-6. Second arc groove; 4-7. Opening groove; 5. Movable arm; 5-1. Long hole; 5-2. Shift fork; 5-3. Groove; 6. Compression spring; 7. Locking tongue; 8. Guide rod; 9. Clamping component; 9-1. First arc groove; 10. Pin; 11. Return spring; 12. Force rod. Detailed Implementation

[0048] To address the problems in the background technology, the core inventive concept of this utility model is as follows: A direct-drive mechanism is used to drive the clamping component to move away from the brake shaft, and the force-applying rod line of the direct-drive mechanism supports the movable arm and the hook body, allowing the hook body to slide under its own weight, thereby releasing the brake. During the release of the brake, the operator only needs to control the direct-drive mechanism, making the operation simple and safe.

[0049] The present invention will be further described in detail below with reference to an embodiment of the oil pumping unit dead brake device.

[0050] like Figures 1-6 As shown, in one embodiment, the pumping unit dead brake device includes a hook body 4, a direct drive mechanism, a force application rod 12, a movable arm 5, a clamping member 9, and a guide rod 8. One end of the hook body 4 in the length direction is provided with a trapezoidal block 4-1, and the other end is provided with a sliding hole 4-5 for the dead brake shaft 3 fixed on the gearbox to pass through.

[0051] The direct drive mechanism includes an output end capable of moving straight up and down, and a force bar 12 extends horizontally and is connected to the output end of the direct drive mechanism;

[0052] One end of the movable arm 5 near the trapezoidal block 4-1 is hinged to the hook body 4, and the other end is provided with a fork 5-2. The force bar 12 passes through the gap between the movable arm 5 and the hook body 4.

[0053] The clamping member 9 is disposed in the sliding hole 4-5, and the clamping member 9 has a first arc-shaped groove 9-1 with a hole diameter matching the outer diameter of the dead brake shaft 3 at one end near the dead brake shaft 3;

[0054] The hook body 4 is provided with a guide hole 4-4, the guide rod 8 passes through the guide hole 4-4 and is guided and engaged with the guide hole 4-4, and one end of the guide rod 8 is fixedly connected to the clamping part 9;

[0055] The guide rod 8 has a protrusion on its outer circumferential surface. The fork 5-2 is used to cooperate with the protrusion to lift the guide rod 8 under the action of the force bar 12 (the fork 5-2 is inserted under the protrusion and avoids the guide rod 8, so that the fork 5-2 can lift the guide rod 8 through the protrusion). The guide rod 8 is fitted with a compression spring 6 for pressing down the clamping member 9. The hook body 4 includes a compression spring mounting beam 4-3 located above the protrusion. The compression spring 6 is pressed between the side of the protrusion away from the fork 5-2 and the compression spring mounting beam 4-3.

[0056] The groove wall of the first arc-shaped groove 9-1 has a locking state for engaging with the inner wall surface of the sliding hole 4-5 under the action of the compression spring 6 to clamp the dead brake shaft 3, and an unlocking state for separating from the dead brake shaft 3 so that the hook body 4 and the dead brake shaft 3 can move relative to each other along the length direction of the hook body 4.

[0057] Along the length of the hook body 4, the first arc-shaped groove 9-1 near the groove wall of the trapezoidal locking block 4-1 constitutes an upper unlocking limit part, and the first arc-shaped groove 9-1 away from the groove wall of the trapezoidal locking block 4-1 constitutes a lower unlocking limit part. Each unlocking limit part satisfies the following condition: when the dead brake shaft 3 is engaged with the corresponding unlocking limit part, the trapezoidal locking block 4-1 unlocks from the dovetail groove of the dead brake wheel 1. At this time, this embodiment constitutes... Figure 6 Example 2 is shown.

[0058] The preferred direct drive mechanism is a linear motor 2 mounted on the gearbox of the pumping unit. The force rod 12 is connected to the output seat (i.e., output end) of the linear motor 2 by a threaded connection. The linear motor 2 can precisely control the position of the output end, i.e., control the position of the force rod 12, thereby precisely controlling the timing of each chain reaction during the upward movement of the force rod 12.

[0059] The clamping member 9 is a clamping block, and the first arc-shaped groove 9-1 is provided on the surface of the clamping block near the end of the dead brake shaft 3.

[0060] One end of the guide rod 8 is provided with an external thread, and the clamping part 9 is provided with a corresponding threaded hole. The guide rod 8 and the clamping part 9 are threadedly connected, which facilitates assembly.

[0061] The compression spring mounting beam 4-3 is provided with an opening slot 4-7 or a clearance hole to avoid interference between the guide rod 8 and the compression spring mounting beam 4-3.

[0062] In other embodiments, the direct-acting drive mechanism can also be a direct-acting hydraulic cylinder. In this case, the original hydraulic station at the wellhead can be used to supply fluid to the direct-acting hydraulic cylinder.

[0063] In other embodiments, the direct-acting drive mechanism can also be a direct-acting cylinder. In this case, an additional air pressure station is required to supply air to the direct-acting cylinder.

[0064] In other embodiments, the clamping member 9 is a semi-cylinder, with the rectangular end face of the semi-cylinder being the end closest to the dead brake shaft 3. The rectangular end face is provided with the first arc-shaped groove 9-1 to ultimately form an arc-shaped plate-like clamping member 9.

[0065] In other embodiments, the guide rod 8 and the clamping member 9 can also be fixedly connected by welding, snap-fitting or other methods.

[0066] In other embodiments, the compression spring 6 can also be installed between the clamping member 9 and the inner wall of the sliding hole 4-5. In this case, there is no need to set up the compression spring mounting beam 4-3, and the structure is simple.

[0067] In other embodiments, the inner wall surface of the sliding hole 4-5 near the trapezoidal block 4-1 can also constitute an upper unlocking limit part. The dead brake shaft 3 and the inner wall surface of the sliding hole 4-5 near the trapezoidal block 4-1 stop to restrict the hook body 4 from continuing to move diagonally downward. After that, when the force bar 12 continues to move upward, the hook body 4 rotates clockwise to make the trapezoidal block 4-1 disengage from the dovetail groove.

[0068] In other embodiments, the inner wall surface of the sliding hole 4-5 away from the trapezoidal block 4-1 can also constitute a lower unlocking limit part. The dead brake shaft 3 and the inner wall surface of the sliding hole 4-5 away from the trapezoidal block 4-1 stop to restrict the hook body 4 from continuing to move obliquely upward. Thereafter, when the force bar 12 continues to move upward, the hook body 4 rotates clockwise to disengage the trapezoidal block 4-1 from the dovetail groove.

[0069] To facilitate understanding by those skilled in the art, the beneficial effects of the oil pumping unit brake device of this utility model will be described in detail below in conjunction with specific usage.

[0070] like Figure 1 As shown, during the dead braking condition, the trapezoidal block 4-1 falls into the dovetail groove of the dead brake wheel 1 and cooperates with the groove wall of the dovetail groove. Under the action of the compression spring 6, the clamping member 9 cooperates with the inner wall surface of the perforation to clamp the dead brake shaft 3, thereby preventing the hook body 4 from moving and ensuring that the trapezoidal block 4-1 locks the dead brake wheel 1.

[0071] When the dead brake is to be released, the operator only needs to control the output end of the direct drive mechanism (such as linear motor 2, direct hydraulic cylinder or direct air cylinder) to move upward through the control mechanism such as remote control or on-site operation buttons. How to control the output end of the direct drive mechanism to move upward is existing technology and will not be described in detail here.

[0072] When the brake wheel 1 is stuck clockwise (i.e., when the brake shaft 3 cannot rotate clockwise), during the upward movement of the output end, the force rod 12 also moves upward. The chain reaction caused by the upward movement of the force rod 12 is as follows:

[0073] Reference Figure 5 As shown, the force-applying rod 12 moves upward and pushes the movable arm 5 upward. Since one end of the movable arm 5 is hinged to the fixed hook body 4, the force-applying rod 12 will drive the fork 5-2 at the other end of the movable arm 5 to tilt upward. The fork 5-2 cooperates with the protrusion to drive the guide rod 8 and the clamping member 9 to move obliquely upward. The first arc-shaped groove 9-1 on the clamping member 9 disengages from the dead brake shaft 3.

[0074] After the first arc-shaped groove 9-1 disengages from the dead brake shaft 3, the dovetail groove of the dead brake wheel 1 and the contact point of the trapezoidal locking block 4-1 form the first fulcrum, and the contact point of the force application rod 12 and the movable arm 5 form the second fulcrum. Under the influence of the first and second fulcrums, the hook body 4 moves diagonally downward along its own length under its own weight until the dead brake shaft 3 stops at the upper unlocking limit part.

[0075] It should be noted that during the process of the hook body 4 moving diagonally downward, whenever the hook body 4 moves diagonally downward by a small displacement, the first fulcrum will temporarily disappear. Under the influence of the single-point support of the second fulcrum, the hook body 4 will rotate clockwise under the action of its own rotation until the trapezoidal block 4-1 contacts the dovetail groove to form a new first fulcrum.

[0076] like Figure 6 As shown, the dead brake shaft 3 cooperates with the upper unlocking limit stop. At this time, the hook body 4 can no longer move diagonally downward, and there is a sufficient gap between the trapezoidal block 4-1 and the groove wall of the dovetail groove.

[0077] After that, the force rod 12 continues to move upward. Since the hook body 4 can no longer move diagonally downward, the dead brake shaft 3 becomes the rotation axis of the hook body 4. The force rod 12 drives the end of the hook body 4 with the trapezoidal locking block 4-1 to rotate clockwise around the rotation axis through the movable arm 5, so that the trapezoidal locking block 4-1 rotates out of the dovetail groove to release the dead brake.

[0078] Similarly, when the brake wheel 1 is stuck counterclockwise (i.e., when the brake shaft 3 cannot rotate counterclockwise), during the upward movement of the output end, the force rod 12 also moves upward. The chain reaction caused by the upward movement of the force rod 12 is as follows:

[0079] The force lever 12 moves upward and pushes the movable arm 5 upward. Since one end of the movable arm 5 is hinged to the fixed hook body 4, the force lever 12 will drive the fork 5-2 at the other end of the movable arm 5 to tilt upward. The fork 5-2 cooperates with the protrusion to drive the guide rod 8 and the clamping member 9 to move obliquely upward. The first arc groove 9-1 on the clamping member 9 disengages from the dead brake shaft 3.

[0080] Afterwards, the force bar 12 continues to move upward. At this time, the groove wall of the dovetail groove is used to support the trapezoidal locking block 4-1, thereby supporting the hook body 4. Therefore, the hook body 4 will not move diagonally downward.

[0081] After the force-applying rod 12 continues to move upward a certain distance, the force applied by the force-applying rod 12 to the movable arm 5 is sufficient to drive the hook body 4 upward. Afterward, the force-applying rod 12 continues to move upward, and the hook body 4 moves diagonally upward. After the hook body 4 moves a small displacement diagonally upward, the wall of the dovetail groove separates from the trapezoidal locking block 4-1, so the hook body 4 will rotate under its own weight until the trapezoidal locking block 4-1 contacts the wall of the dovetail groove again.

[0082] After the force bar 12 continues to move upward a certain distance, the dead brake shaft 3 engages with the lower unlocking limit stop. At this time, the hook body 4 can no longer move diagonally upward, and there is a sufficient gap between the trapezoidal block 4-1 and the dovetail groove wall.

[0083] After that, the force rod 12 continues to move upward. Since the hook body 4 can no longer move diagonally upward, the dead brake shaft 3 becomes the rotation axis of the hook body 4. The force rod 12 drives the end of the hook body 4 with the trapezoidal locking block 4-1 to rotate clockwise around the rotation axis through the movable arm 5, so that the trapezoidal locking block 4-1 rotates out of the dovetail groove to release the dead brake.

[0084] In summary, after using the pumping unit dead brake device of this utility model, the dead brake can be released simply by moving the output end of the direct drive mechanism upward. It is easy to operate, and the staff does not need to work at height, resulting in a high safety factor.

[0085] In other embodiments, the pumping unit brake device may not include the unlocking limit part; in this case, the embodiment is configured as follows: Figure 5 Example 1 is shown.

[0086] When the dead brake is unlocked, the force lever 12 continuously applies an upward force to the hook body 4 through the movable arm 5. This force can be divided into a first component force along the length of the hook body 4 and a second component force perpendicular to the first component force. The first component force interacts with the component force of gravity to make the hook body 4 move along the length of the hook body 4, and the second component force interacts with the component force of gravity to make the hook body 4 rotate clockwise.

[0087] During the upward or downward movement of the hook body 4, at the instant the trapezoidal locking block 4-1 separates from the corresponding wall of the dovetail groove, the hook body 4 will rotate slightly clockwise until the trapezoidal locking block 4-1 contacts the corresponding wall of the dovetail groove again. Therefore, by reasonably controlling the upward speed of the force-applying rod 12, at the instant the trapezoidal locking block 4-1 completely separates from the corresponding wall of the dovetail groove, the trapezoidal locking block 4-1 can be rotated out of the dovetail groove, thereby releasing the dead brake.

[0088] To facilitate understanding by those skilled in the art, the following description will take the case of the dead brake wheel 1 jamming clockwise as an example.

[0089] like Figure 5 As shown, when the hook body 4 moves diagonally downward, the hook body 4 rotates clockwise simultaneously, and the trapezoidal block 4-1 gradually separates from the left wall of the dovetail groove. When the trapezoidal block 4-1 is completely separated from the left wall of the dovetail groove, the hook body 4 rotates clockwise to make the trapezoidal block 4-1 rotate out of the dovetail groove, thereby avoiding contact between the trapezoidal block 4-1 and the right wall of the dovetail groove.

[0090] like Figure 6 As shown, in Embodiment 2, the trapezoidal block 4-1 is directly restricted to its extreme position of downward movement by unlocking the limiting part, thereby preventing the trapezoidal block 4-1 from contacting the right wall of the dovetail groove.

[0091] In the above embodiment, when the force-applying rod 12 drives the hook body 4 to rotate around the dead brake shaft 3, the force applied by the force-applying rod 12 to the movable arm 5 needs to overcome the entire force of the compression spring 6 on the movable arm 5, which requires the linear motor 2 to have a large output power.

[0092] To facilitate the application of force rod 12 to drive hook body 4 to rotate around dead brake shaft 3, such as Figures 1-6 As shown, in one embodiment, the hook body 4 is provided with an installation groove, and a locking tongue 7 for cooperating with the shift fork 5-2 is installed in the installation groove. A return spring 11 is provided between the locking tongue 7 and the bottom wall of the installation groove. The shift fork 5-2 has an unlocking position located below the locking tongue 7 and a locking position located above the locking tongue 7 and cooperating with the locking tongue 7 in the up and down direction.

[0093] The locking tongue 7 has a first guide slope on the side facing the shift fork 5-2, and the tail end of the shift fork 5-2 has a second guide slope that matches the first guide slope.

[0094] When the shift fork 5-2 moves upward under the action of the force bar 12, the first guide slope and the second guide slope cooperate, and the shift fork 5-2 pushes the locking tongue 7 to compress the return spring 11; when the shift fork 5-2 moves above the locking tongue 7, the return spring 11 drives the locking tongue 7 to return to its original position. At this time, the shift fork 5-2 and the locking tongue 7 cooperate in the up and down direction, the compression spring 6 cannot extend, so the clamping part 9 cannot move downward, and the shift fork 5-2 is in the locked position.

[0095] When the shift fork 5-2 is in the locked position, the force applied by the force lever 12 to the movable arm 5 does not need to overcome the entire force of the compression spring 6 on the movable arm 5. This allows the force applied by the force lever 12 to act more on the rotation of the movable arm 5 and the hook body 4. This is beneficial for the force lever 12 to drive the hook body 4 to rotate around the dead brake shaft 3, which helps to reduce the maximum output power of the linear motor 2 so that a linear motor 2 with a smaller rated power can be selected, thus saving costs.

[0096] To facilitate switching the shift fork 5-2 from the locked position to the unlocked position, such as Figures 1-6 As shown, in one embodiment, a hinge shaft is connected to the hook body 4, and a hinge hole is provided on the movable arm 5. The hinge shaft passes through the hinge hole to realize the hinge between the hook body 4 and the movable arm 5. The hinge hole is an elongated hole 5-1 extending along the length direction of the hook body 4, and the length of the elongated hole 5-1 satisfies the following: when the hinge shaft is located at one end of the elongated hole 5-1 close to the trapezoidal block 4-1, the fork 5-2 has the unlocking position and the locking position; when the hinge shaft is located at one end of the elongated hole 5-1 away from the trapezoidal block 4-1, the locking tongue 7 is unlocked from the fork 5-2.

[0097] The hinge shaft can be integrally formed with the hook body 4, or the hook body 4 is provided with a pin hole 4-2, and the hinge shaft is a pin 10 installed in the pin hole 4-2, so as to prevent the movable arm 5 from separating from the hook body 4.

[0098] When the brake wheel 1 is stuck clockwise (i.e., when the brake shaft 3 cannot rotate clockwise), after releasing the brake according to the above steps, continue to move the force rod 12 upward. The force rod 12 drives the movable arm 5 to move relative to the hook body 4. The movable arm 5 moves obliquely upward relative to the hook body 4, thereby changing the hinge shaft from the end of the long hole 5-1 near the trapezoidal block 4-1 to the end of the long hole 5-1 away from the trapezoidal block 4-1, thereby unlocking the fork 5-2 and the locking tongue 7.

[0099] Then, the force bar 12 is moved downwards, and under the action of the compression spring 6, the shift fork 5-2 moves downwards and moves below the locking tongue 7.

[0100] When the brake wheel 1 is stuck counterclockwise (i.e., when the brake shaft 3 cannot rotate counterclockwise), during the release of the brake, the force rod 12 needs to drive the movable arm 5 upward before it can drive the hook body 4 upward. Since the hinge shaft is already located at the end of the elongated hole 5-1 away from the trapezoidal block 4-1 before the hook body 4 moves upward, the locking tongue 7 is ineffective.

[0101] In other embodiments, the hinge hole can also be a round hole that matches the pin 10. In this case, the operator needs to use a tool to press the locking tongue 7 to compress the return spring 11 and make the shift fork 5-2 switch to the unlocking position under the action of the compression spring 6.

[0102] exist Figures 1-6 In the illustrated embodiment, the sliding hole 4-5 is a rectangular sliding hole with a simple structure. During the movement of the clamping block, the movement trajectories of the two ends of the clamping block along the length of the hook body are two parallel line segments. The two ends of the clamping block can be clearance-fitted with the two side walls of the sliding hole 4-5, so that the two side walls of the sliding hole 4-5 further guide the clamping block.

[0103] In other embodiments, the sliding hole 4-5 can also be a trapezoidal sliding hole, a triangular sliding hole, or other irregularly shaped sliding holes. In this case, the sliding hole 4-5 does not guide the clamping member 9, but only relies on the cooperation of the guide rod 8 and the guide hole 4-4 to guide the movement of the clamping member 9.

[0104] exist Figures 1-6 In the embodiment shown, a second arc-shaped groove 4-6 is provided on the inner wall surface of the sliding hole 4-5. The groove wall of the second arc-shaped groove 4-6 is used to cooperate with the groove wall of the first arc-shaped groove 9-1 to clamp the dead brake shaft 3.

[0105] Compared to the technical solution where the inner wall surfaces of the sliding holes 4-5 are all flat, the first arc groove 9-1 and the second arc groove 4-6 can better clamp the brake shaft 3 and better prevent the hook body 4 from moving unexpectedly.

[0106] exist Figures 1-6 In the embodiment shown, the movable arm 5 has a groove 5-3 on the side wall near the force rod 12. The force rod 12 passes through the gap between the groove wall of the groove 5-3 and the hook body 4. At this time, the shift fork 5-2 can be brought closer to the sliding hole 4-5, thereby reducing the overall volume of the pumping unit dead brake device.

[0107] In other embodiments, the groove 5-3 may not be provided, the force bar 12 passes through the gap between the movable arm 5 and the hook body 4, the fork 5-2 is far from the sliding hole 4-5, the protrusion is adaptively located in a relatively high position, and the initial compression amount of the compression spring 6 is large.

[0108] In different embodiments, when the compression spring 6 is installed between the compression spring mounting beam 4-3 and the protrusion, the initial compression of the compression spring 6 can be adjusted by changing the position of the compression spring mounting beam 4-3.

[0109] In a preferred embodiment, the central angle corresponding to the first arc groove 9-1 is 180°, which can better clamp the brake shaft 3 and better fix the position of the hook body 4.

[0110] In other embodiments, the circular angle corresponding to the first arc groove 9-1 may also be less than 180°, for example, 45°, 70°, 90°, 120° or 150°. As long as the first arc groove 9-1 can cooperate with the inner wall surface of the sliding hole 4-5 to clamp the dead brake shaft 3, while preventing the hook body 4 from moving along its own length direction.

[0111] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some technical features, or organically combine different specific implementation methods to create the specific implementation methods shown in the accompanying drawings. Of course, those skilled in the art can also create other specific implementation methods not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dead-stop device for a pumping unit, comprising a hook body, one end of which is provided with a trapezoidal locking block along its length, and the other end of which is provided with a sliding hole for a dead-stop shaft to pass through, characterized in that, It also includes a direct drive mechanism, a force-applying lever, a movable arm, a clamping component, and a guide rod; The direct drive mechanism includes an output end capable of moving vertically up and down, and a force-applying rod extending horizontally and connected to the output end of the direct drive mechanism; The end of the movable arm near the trapezoidal block is hinged to the hook body, and the other end is equipped with a fork. The force-applying rod passes through the gap between the movable arm and the hook body. The clamping member is disposed in the sliding hole, and the end of the clamping member used to approach the dead brake shaft has a first arc-shaped groove with a hole diameter that matches the outer diameter of the dead brake shaft; The hook body is provided with a guide hole, the guide rod passes through the guide hole and is guided and engaged with the guide hole, and one end of the guide rod is fixedly connected to the clamping part; The guide rod has a protrusion on its outer circumference. The shift fork is used to cooperate with the protrusion to lift the guide rod under the action of the force rod. A compression spring for pressing down on the clamping member is fitted on the guide rod. The compression spring is installed between the clamping member and the wall of the sliding hole. Alternatively, the hook body includes a compression spring mounting beam located above the protrusion. The compression spring is pressed between the side of the protrusion away from the shift fork and the compression spring mounting beam.

2. The pumping unit dead braking device as described in claim 1, characterized in that, Along the length of the hook body, the sliding hole near the inner wall of the trapezoidal block or the first arc groove near the groove wall of the trapezoidal block constitutes the upper unlocking limit part, and the sliding hole away from the inner wall of the trapezoidal block or the first arc groove away from the groove wall of the trapezoidal block constitutes the lower unlocking limit part. Each unlocking limit part satisfies the following: when the dead brake shaft is engaged with the corresponding unlocking limit part, the trapezoidal block and the dovetail groove of the dead brake wheel are unlocked.

3. The pumping unit dead braking device as described in claim 1 or 2, characterized in that, The hook body is provided with a mounting groove, in which a locking tongue is installed for cooperating with the shift fork. A return spring is provided between the locking tongue and the bottom wall of the mounting groove. The shift fork has an unlocking position located below the locking tongue and a locking position located above the locking tongue and cooperating with the locking tongue in the up and down direction.

4. The pumping unit dead braking device as described in claim 3, characterized in that, A hinge shaft is connected to the hook body, and a hinge hole is provided on the movable arm. The hinge shaft passes through the hinge hole to realize the hinge between the hook body and the movable arm. The hinge hole is an elongated hole extending along the length of the hook body, and the length of the elongated hole satisfies the following conditions: when the hinge shaft is located at the end of the elongated hole close to the trapezoidal block, the fork has the unlocking position and the locking position; when the hinge shaft is located at the end of the elongated hole away from the trapezoidal block, the locking tongue and the fork are unlocked.

5. The pumping unit dead braking device as described in claim 1 or 2, characterized in that, The sliding hole is a rectangular sliding hole.

6. The pumping unit dead braking device as described in claim 5, characterized in that, The sliding hole has a second arc-shaped groove on its wall. The groove wall of the second arc-shaped groove is used to cooperate with the groove wall of the first arc-shaped groove to clamp the dead brake shaft.

7. The pumping unit dead braking device as described in claim 1 or 2, characterized in that, The movable arm has a groove on the side wall near the force-applying rod, and the force-applying rod passes through the gap between the groove wall and the hook body.

8. The pumping unit dead braking device as described in claim 1 or 2, characterized in that, One end of the guide rod is provided with an external thread, and the clamping part is provided with a corresponding threaded hole. The guide rod and the clamping part are threadedly connected.

9. The pumping unit dead braking device as described in claim 1 or 2, characterized in that, The clamping element is a clamping block.

10. The pumping unit dead braking device as described in claim 1 or 2, characterized in that, The direct drive mechanism is a linear motor installed on the gearbox of the pumping unit.

Images