Oil pumping unit brake safety hook

Abstract

The utility model belongs to a mechanism used for enabling an element to be static at a preset position, and particularly relates to a pumping unit brake safety hook. In order to solve the technical problem that in the prior art, a fixed screw in a lock sleeve type oil pumping unit dead brake safety hook device can deform under the action of shearing force, so that a beam-pumping unit cannot be unlocked on the premise that a dead brake wheel is not rotated, the utility model provides an oil pumping unit dead brake safety hook. Comprising a safety hook body and a lock sleeve, a containing groove is formed in the side face of the lock sleeve, the safety hook body is provided with an extending-in part capable of entering and exiting the containing groove from the side portion, the containing groove comprises a stopping part and an avoiding part, and the stopping part and the extending-in part are in stopping fit in the vertical direction; the avoiding part is used for providing a stroke for downward movement of the extending part so that the extending part can be completely separated from the side wall of the containing groove after the extending part moves downwards by the set stroke. The stretching-in part moves downwards by a certain stroke to remove the load, so that the beam-pumping unit is unlocked on the premise that the dead brake wheel is not rotated.

Description

Technical Field

[0001] The utility model belongs to a mechanism for making a component stationary at a predetermined position, in particular to a dead brake safety hook of an oil pumping unit. Background Art

[0002] When inspecting and repairing a beam pump, the machine must be stopped and braked, and the dead brake safety hook of the pump must fall into the dovetail groove of the dead brake wheel. When the beam pump slips, the dead brake safety hook of the pump will form a rigid brake with the dead brake wheel and lock the beam pump to ensure that no safety accidents occur during maintenance.

[0003] like Figure 1-2 As shown in FIG. 1 , a Chinese utility model patent with authorization announcement number CN206159336U and authorization announcement date 2017.05.10 discloses a locking sleeve type dead brake safety hook device for an oil pumping unit, which includes a safety hook body 1 rotatably connected to other mechanisms, a trapezoidal locking sleeve 2 with a regular trapezoidal cross section, and a fixing screw 4 for fixing the safety hook body 1 and the locking sleeve 2 as a whole. Figure 1 As shown, when the dead brake safety hook device of the locking sleeve type oil pumping unit is stuck in the walking beam type oil pumping unit, the trapezoidal locking sleeve 2 will lock the dead brake wheel 3 to prevent the dead brake wheel 3 from continuing to rotate, thereby ensuring that no safety accidents occur during maintenance.

[0004] After the maintenance is completed, the locking sleeve type pumping unit dead brake safety hook device needs to be moved out of the dovetail groove of the dead brake wheel 3 to unlock the beam pumping unit. Figure 1 As shown, in order to meet the safety standards, the shape of the trapezoidal lock sleeve 2 needs to be matched with the shape of the dovetail groove of the dead brake wheel 3 (that is, the cross section of the trapezoidal lock sleeve 2 is a regular trapezoid) to ensure that the trapezoidal lock sleeve 2 is in surface contact with the dead brake wheel 3. Since one side of the trapezoidal lock sleeve 2 is in surface contact with the dead brake wheel 3, the safety hook body 1 cannot be directly rotated in the clockwise direction, resulting in the trapezoidal lock sleeve 2 being unable to directly disengage from the dovetail groove of the dead brake wheel 3 and being unable to directly unlock the beam pumping unit.

[0005] There are two ways to unlock the beam pumping unit in the prior art. Method 1: Use a crane to pull the dead brake wheel 3 along the Figure 1 The dead brake wheel 3 is rotated counterclockwise to separate the trapezoidal lock sleeve 2, so that the safety hook body 1 can rotate clockwise and unlock the beam pumping unit; Method 2: Figure 2As shown, the trapezoidal locking sleeve 2 has an inverted trapezoidal avoidance hole, and one end of the safety hook body 1 is an inverted trapezoidal insertion portion 11 that extends into the avoidance hole. The insertion portion 11 extends into the avoidance hole and does not contact the inner wall surface of the trapezoidal locking sleeve 2. After the fixing screw 4 is removed, the safety hook body 1 is rotated clockwise to make the insertion portion 11 rotate out of the avoidance hole, and then the trapezoidal locking sleeve 2 is removed, thereby unlocking the walking beam oil pump without rotating the dead brake wheel 3.

[0006] When the above-mentioned locking sleeve type oil pump dead brake safety hook device is used to lock the walking beam oil pump, since the trapezoidal locking sleeve 2 directly blocks the movement of the dead brake wheel 3, the safety hook body 1 needs to apply force to the trapezoidal locking sleeve 2 to balance the force applied by the dead brake wheel 3 to the trapezoidal locking sleeve 2. Specifically, the safety hook body 1 applies force to the trapezoidal locking sleeve 2 through the fixing screw 4, which causes the fixing screw 4 to be subjected to a large shear force. Under the action of the shear force, the fixing screw 4 will be deformed or sheared, resulting in the inability to remove the fixing screw 4 from the trapezoidal locking sleeve 2 and the safety hook body 1, thereby causing the safety hook body 1 and the trapezoidal locking sleeve 2 to be always connected as a whole, and the walking beam oil pump cannot be unlocked without rotating the dead brake wheel 3. Utility Model Content

[0007] The purpose of the utility model is to provide a dead brake safety hook for an oil pump to solve the technical problem that the fixing screw in the locking sleeve type oil pump dead brake safety hook device in the prior art will be deformed or sheared under the action of shear force, resulting in the inability to remove the fixing screw from the trapezoidal locking sleeve and the safety hook body, thereby resulting in the inability to unlock the walking beam type oil pump without rotating the dead brake wheel.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the dead brake insurance hook of the oil pump provided by the utility model is:

[0009] A dead brake safety hook for an oil pump comprises a safety hook body and a locking sleeve for cooperating with a dovetail groove stopper of a dead brake wheel, a receiving groove is arranged on the side of the locking sleeve, the safety hook body has an insertion portion capable of entering and exiting the receiving groove from the side, the receiving groove comprises a stopper portion matching at least a portion of a cross section of the insertion portion and an avoidance portion located below the stopper portion, the stopper portion being used to cooperate with the insertion portion along the up and down directions when the dead brake wheel is dead braked, the avoidance portion being used to provide a stroke for the insertion portion to move downward so that the insertion portion is completely separated from the side wall of the receiving groove after a set downward stroke; the dead brake safety hook for the oil pump also comprises a fixing structure for detachably fixing the locking sleeve and the insertion portion.

[0010] Furthermore, the cross section of the protruding portion is a regular trapezoid.

[0011] Furthermore, the cross section of the locking sleeve is a regular trapezoid, and two waists on the cross section of the extending portion are respectively parallel to corresponding waists on the cross section of the locking sleeve.

[0012] Furthermore, the upper end of the accommodating groove is located at the upper surface of the lock sleeve and communicates with the outside.

[0013] Furthermore, one of the insertion portion and the locking sleeve is provided with a fixing hole, and the other is provided with a long guide hole extending in the up-down direction. The insertion portion and the locking sleeve are provided with a fixing piece that simultaneously penetrates the fixing hole and the long guide hole to prevent the insertion portion from escaping from the side of the locking sleeve. The fixing piece, the fixing hole and the long guide hole constitute the fixing structure.

[0014] Furthermore, the fixing hole is arranged on the extending portion, and an internal thread is arranged on the inner wall of the fixing hole. The guide long hole is a through hole and is arranged on the locking sleeve. The fixing piece is a bolt, and an external thread matching the internal thread is arranged on the bolt.

[0015] Furthermore, the fixing hole and the guide long hole are both through holes.

[0016] Furthermore, the cross section of the accommodating groove is a regular trapezoid.

[0017] The beneficial effects of the dead brake safety hook of the oil pump of the utility model are as follows: the utility model is an improved invention. By providing a fixing structure in which the lock sleeve and the insertion part are detachably fixedly connected, the lock sleeve and the safety hook body can be fixedly connected when the dead brake is applied, thereby braking the dead brake wheel, and the fixing structure can be removed when the dead brake is released, providing conditions for moving the lock sleeve or the safety hook body separately; a receiving groove is provided on the side of the lock sleeve, and the insertion part can enter and exit the receiving groove from the side of the receiving groove, and force can be applied from the side of the lock sleeve to separate the insertion part from the lock sleeve; a stopper part that matches the cross section of the insertion part can be used to make the insertion part contact the stopper part surface and stop the locking part in the up and down directions. The locking member is engaged to prevent the safety hook body from rotating, thereby braking the dead brake wheel. At this time, the torque applied by the dead brake wheel to the locking sleeve is transmitted to the insertion portion through the stopper portion. The stopper portion and the insertion portion are in surface contact, which meets the safety regulations. By arranging the avoidance portion, the insertion portion can be made to move downward to a set stroke when the walking beam pump is unlocked, and it is ensured that the insertion portion is completely separated from the side wall of the accommodating groove, thereby removing the load between the stopper portion and the insertion portion, making it convenient for subsequent force to be applied to the locking sleeve from the side to remove the locking sleeve from the dead brake wheel, thereby unlocking the walking beam pump without rotating the dead brake wheel. When using the dead brake safety hook of the oil pump in the present technical solution, first, make the insertion part enter the accommodating groove from the side of the accommodating groove, and use the fixed structure to fix the locking sleeve and the insertion part when the insertion part and the stop part cooperate in the up and down directions; then, make the locking sleeve and the insertion part enter the dovetail groove of the dead brake wheel to realize the dead brake of the walking beam oil pump; when you want to unlock the walking beam oil pump, first, disassemble the fixing structure, then, knock the safety hook body to make the insertion part move downward for a distance, ensure that the side wall of the accommodating groove is separated from the insertion part, remove the load between the stop part and the insertion part, finally, knock the locking sleeve from the side to separate the insertion part from the locking sleeve, and rotate the safety hook body to make the insertion part leave the dovetail groove of the dead brake wheel to complete the unlocking of the walking beam oil pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the locking sleeve type oil pumping unit dead brake insurance hook device in the prior art when in use;

[0019] Figure 2 It is a partial cross-sectional view of the locking sleeve type oil pumping unit dead brake safety hook device in the prior art when in use;

[0020] Figure 3 It is a structural schematic diagram of an embodiment of the dead brake safety hook of the oil pumping unit of the utility model when the dead brake wheel is locked;

[0021] Figure 4 for Figure 3 A partial enlarged view of

[0022] Figure 5It is a structural schematic diagram of an embodiment of the dead brake safety hook of the oil pumping unit of the utility model when the dead brake wheel is unlocked;

[0023] Figure 6 for Figure 5 A partial enlarged view of

[0024] Figure 7 It is a front view of a lock sleeve of an embodiment of the dead brake safety hook of an oil pumping unit of the utility model;

[0025] Figure 8 It is a top view of a locking sleeve of an embodiment of the dead brake safety hook of an oil pumping unit of the utility model.

[0026] Description of reference numerals:

[0027] 1. Safety hook body; 11. Insertion part; 111. Fixing hole; 2. Lock sleeve; 21. Long guide hole; 22. Accommodating groove; 221. Avoidance part; 3. Dead brake wheel; 4. Fixing screw. DETAILED DESCRIPTION

[0028] In the present invention, a regular trapezoid refers to a non-right-angled trapezoid in which the length of the upper base is smaller than the length of the lower base; an inverted trapezoid refers to a non-right-angled trapezoid in which the length of the upper base is larger than the length of the lower base.

[0029] In order to solve the problems existing in the background technology, the main inventive concept of the utility model is as follows: by arranging a receiving groove on the side of the locking sleeve, the insertion part can enter and exit the receiving groove from the side, so that the insertion part can be taken out of the receiving groove from the side; at the same time, the receiving groove has a stop part and an avoidance part that match the cross-section of the insertion part, so that when the dead brake wheel is braked, the load applied by the dead brake wheel to the locking sleeve can be transmitted to the insertion part through the stop part, and when the dead brake is released, the avoidance part is used to provide a stroke for the insertion part to move downward, so that the stop part is separated from the insertion part, thereby removing the load between the stop part and the insertion part, making it convenient to knock the locking sleeve from the side of the locking sleeve and make the insertion part detach from the receiving groove, and then the locking sleeve can be conveniently removed, and the walking beam oil pump can be unlocked without rotating the dead brake wheel.

[0030] The present invention is further described in detail below in conjunction with the embodiments.

[0031] The specific embodiment of the dead brake safety hook of the oil pump provided by the utility model is as follows:

[0032] like Figure 3-8As shown, as a specific embodiment, the dead brake safety hook of the oil pump includes a safety hook body 1 and a locking sleeve 2 for cooperating with the dovetail groove stop of the dead brake wheel 3, a receiving groove 22 is provided on the side of the locking sleeve 2, the safety hook body 1 has an insertion portion 11 that can enter and exit the receiving groove 22 from the side, the receiving groove 22 includes a stop portion that matches at least a part of the cross section of the insertion portion 11 and an avoidance portion 221 located below the stop portion, the stop portion is used to cooperate with the insertion portion 11 along the up and down directions when the dead brake wheel 3 is dead braked, and the avoidance portion 221 is used to provide a stroke for the downward movement of the insertion portion 11 so that the insertion portion 11 is completely separated from the side wall of the receiving groove 22 after the downward set stroke; the dead brake safety hook of the oil pump also includes a fixing structure for detachably fixing the locking sleeve 2 and the insertion portion 11.

[0033] Specifically, in order to meet the safety standards, the cross section of the lock sleeve 2 is a regular trapezoid. As a specific implementation, through holes are provided on the insertion portion 11 and the lock sleeve 2, and the fixing pin simultaneously penetrates the through holes on the insertion portion 11 and the lock sleeve 2 to detachably fix the insertion portion 11 and the lock sleeve 2. The through holes on the insertion portion 11 and the lock sleeve 2 and the fixing pin together constitute a fixing structure; in the extension direction of the fixing pin, the insertion portion 11 enters the receiving groove 22 from one side of the receiving groove 22 and contacts the bottom of the receiving groove 22. Of course, in other specific implementations, the fixing structure described later can also be adopted.

[0034] By providing a fixing structure that detachably and fixedly connects the lock sleeve 2 and the insertion portion 11, the lock sleeve 2 and the safety hook body 1 can be fixedly connected when the dead brake is applied, so that the dead brake wheel 3 is stopped, and the fixing structure can be removed when the dead brake is released, thereby providing conditions for moving the lock sleeve 2 or the safety hook body 1 separately; a receiving groove 22 is provided on the side of the lock sleeve 2, and the insertion portion 11 can enter and exit the receiving groove 22 from the side of the receiving groove 22, and force can be applied from the side of the lock sleeve 2 to separate the insertion portion 11 from the lock sleeve 2; by using a stopper that matches the cross section of the insertion portion 11, the insertion portion 11 can be in contact with the stopper surface and stop in the up and down directions. The stopper cooperates to prevent the safety hook body 1 from rotating, thereby braking the dead brake wheel 3. At this time, the torque applied by the dead brake wheel 3 to the locking sleeve 2 is transmitted to the insertion portion 11 through the stopper. The stopper and the insertion portion 11 are in surface contact, which meets the safety specifications. By setting the avoidance portion 221, when unlocking the walking beam pump, the insertion portion 11 can be made to move downward to a set stroke, and ensure that the insertion portion 11 is completely separated from the side wall of the accommodating groove 22, thereby removing the load between the stopper and the insertion portion 11, making it convenient for the subsequent side force to be applied to the locking sleeve 2 to remove the locking sleeve 2 from the dead brake wheel 3, thereby unlocking the walking beam pump without rotating the dead brake wheel 3.

[0035] When using the dead brake safety hook of the oil pump in this specific embodiment, first, make the insertion portion 11 enter the accommodating groove 22 from the side of the accommodating groove 22, and use the fixing structure to fix the locking sleeve 2 and the insertion portion 11 when the insertion portion 11 cooperates with the stop portion in the up and down directions; then, make the locking sleeve 2 and the insertion portion 11 fall into the dovetail groove of the dead brake wheel 3 to achieve the dead brake of the walking beam oil pump; when you want to unlock the walking beam oil pump, first, disassemble the fixing structure, then, knock the safety hook body 1 to make the insertion portion 11 move downward for a distance, ensure that the side wall of the accommodating groove 22 is separated from the insertion portion 11, and remove the load between the stop portion and the insertion portion 11, finally, knock the locking sleeve 2 from the side to separate the insertion portion 11 from the locking sleeve 2, and rotate the safety hook body 1 to make the insertion portion 11 leave the dovetail groove of the dead brake wheel 3, so as to complete the unlocking of the walking beam oil pump.

[0036] like Figure 3-6 As shown, in order to conveniently unload the load between the insertion portion 11 and the stopper, as a specific embodiment, the cross section of the insertion portion 11 is a regular trapezoid, so that the insertion portion 11 can be completely separated from the stopper when the insertion portion 11 moves down a very small distance, and the load between the insertion portion 11 and the stopper can be easily unloaded. In other specific embodiments, the insertion portion 11 may include a thicker section and a thinner section. When the dead brake wheel 3 is stopped, the step surface at the junction of the thicker section and the thinner section cooperates with the stopper in the up and down directions, and the thinner section does not contact the side wall of the accommodating groove 22; the height of the avoidance portion 221 is not less than the height of the thicker section, and the insertion portion 11 can be separated from the stopper only when the insertion portion 11 moves down to the same height as the thicker section, and the load between the insertion portion 11 and the stopper can be unloaded, which is difficult to operate.

[0037] like Figure 3-6As shown, in order to reduce the acting force between the insertion portion 11 and the stopper, as a specific implementation, the two waists on the cross section of the insertion portion 11 are parallel to the corresponding waists on the cross section of the lock sleeve 2 (that is, the angle between the two waists on the cross section of the insertion portion 11 and the lower bottom is equal to the angle between the corresponding waists on the cross section of the lock sleeve 2 and the lower bottom). Therefore, when the lock sleeve 2 is not provided, the insertion portion 11 contacts the dovetail groove surface of the dead brake wheel 3 to form a stopper. When studying the acting force between the insertion portion 11 and the stopper, since the dovetail groove of the dead brake wheel 3 contacts the lock sleeve 2 stopper, the torque applied by the lock sleeve 2 to the insertion portion 11 is equal to the torque applied by the dead brake wheel 3 to the lock sleeve 2. Since the two waists on the cross section of the insertion portion 11 are parallel to the corresponding waists on the cross section of the lock sleeve 2, the direction of the force applied by the lock sleeve 2 to the insertion portion 11 is the same as the direction of the force applied by the dead brake wheel 3 to the lock sleeve 2, thereby reducing the acting force between the insertion portion 11 and the stopper. Of course, in other specific embodiments, the angle between the two waists and the lower bottom on the cross section of the insertion portion 11 may be greater than the angle between the corresponding waists and the lower bottom on the cross section of the locking sleeve 2; or, the angle between the two waists and the lower bottom on the cross section of the insertion portion 11 may be smaller than the angle between the corresponding waists and the lower bottom on the cross section of the locking sleeve 2.

[0038] like Figure 3-6 As shown, in order to simplify the structure, as a specific implementation, the upper end of the receiving groove 22 is located at the upper surface of the lock sleeve 2 and communicates with the outside, thereby avoiding interference between the side of the safety hook body 1 and the side of the lock sleeve 2, which can simplify the structure of the safety hook body 1. Specifically, as Figure 3-6 As shown, the safety hook body 1 includes a crossbar and a vertical portion connected to one end of the crossbar and having a regular trapezoidal cross section, the vertical portion constituting an insertion portion 11, at this time, the cross section of the stopper portion coincides with a portion of the cross section of the insertion portion 11, when the dead brake wheel 3 is dead braked, a portion of the insertion portion 11 is located outside the receiving groove 22, and when the insertion portion 11 moves downward for a certain distance, the portion of the insertion portion 11 located outside the receiving groove 22 continues to enter the receiving groove 22 and does not contact the stopper portion; however, in other specific embodiments, the upper end of the receiving groove 22 may be The safety hook body 1 is not connected to the outside world. It can also include a cross bar and a vertical bar connected to one end of the cross bar. The upper end of the vertical bar is connected to the cross bar, and the lower end of the vertical bar is connected to a horizontal part extending along the extension direction of the accommodating groove 22. The extension direction of the horizontal part is perpendicular to the extension direction of the vertical bar, and the extension direction of the horizontal part is perpendicular to the extension direction of the cross bar. The horizontal part constitutes the extension part 11. At this time, the cross section of the stop part coincides with the entire cross section of the extension part 11. When the dead brake wheel 3 is dead braked, the extension part 11 is completely located in the accommodating groove 22.

[0039] like Figure 3-8As shown, in order to conveniently unlock the walking beam pumping unit, as a specific implementation, a fixing hole 111 is provided on the insertion portion 11, and a guide long hole 21 extending in the up-down direction is provided on the locking sleeve 2. The insertion portion 11 and the locking sleeve 2 are provided with a fixing member that simultaneously penetrates the fixing hole 111 and the guide long hole 21 to prevent the insertion portion 11 from slipping out of the side of the locking sleeve 2. The fixing member, the fixing hole 111 and the guide long hole 21 constitute the fixing structure.

[0040] Specifically, the fixing hole 111 is a through hole, and an internal thread is provided on the inner wall of the fixing hole 111, the guide long hole 21 is a through hole, and the fixing piece is a bolt (not shown in the figure), and an external thread matching the internal thread is provided on the bolt. The end of the bolt away from the bolt head is passed through the guide long hole 21 and then screwed into the fixing hole 111, so as to conveniently realize the detachable fixed connection between the insertion part 11 and the locking sleeve 2. Of course, in other specific embodiments, the fixing hole 111 can also be a plain hole, and the fixing piece is a fixing pin, and the fixing pin is inserted into the fixing hole 111 and the guide long hole 21 at the same time to realize the detachable fixed connection between the insertion part 11 and the locking sleeve 2; or, the fixing hole 111 is a blind hole, so that the fixing hole 111 is a through hole, and the fixing piece can be removed from the end of the fixing piece extending from the fixing hole 111, which is more convenient to disassemble.

[0041] In this specific embodiment, when the beam pumping unit is to be unlocked, first, the connection between the insertion portion 11 and the stopper portion is loosened (i.e., the bolt is loosened), and then the safety hook body 1 is knocked to make the insertion portion 11 and the bolt connected to the insertion portion 11 move downward under the guidance of the guide slot 21, and then the connection between the insertion portion 11 and the stopper portion is completely removed (i.e., the bolt is removed) to unlock the beam pumping unit. The insertion portion 11 is guided by the guide slot 21, so that the insertion portion 11 and the stopper portion are separated conveniently, and the load between the insertion portion 11 and the stopper portion is conveniently unloaded; at the same time, when there is a load between the insertion portion 11 and the stopper portion, there will be a certain force between the bolt and the insertion portion 11, which makes it inconvenient to remove the bolt. After the load between the insertion portion 11 and the stopper portion is unloaded, the bolt can be conveniently removed, and the beam pumping unit is conveniently unlocked.

[0042] Of course, in other specific embodiments, the fixing hole may also be provided on the locking sleeve 2, and the long guide hole 21 may also be provided on the insertion portion 11. In this case, the locking sleeve 2 and the fixing member (such as a bolt) do not move. After the bolt is loosened, the insertion portion 11 moves downward under the guidance of the fixing member to remove the load between the insertion portion 11 and the stop portion.

[0043] like Figure 3-8As shown, in order to facilitate the processing of the receiving groove 22, as a specific embodiment, the cross section of the receiving groove 22 is a regular trapezoid, so that the stopper and the avoidance portion 221 do not need to be processed separately, and only one receiving groove 22 with a regular trapezoidal cross section can be processed, and the upper part of the receiving groove 22 constitutes the stopper, and the lower part of the receiving groove 22 constitutes the avoidance portion 221. Of course, in other specific embodiments, the cross section of the avoidance portion 221 can also be rectangular, and the avoidance portion 221 and the stopper are processed separately, or the lock sleeve 2 is cast by a casting process; or the lock sleeve 2 is processed by a milling machine. In this embodiment, the specific structure of the avoidance portion 221 is not limited, as long as the avoidance portion 221 can provide a downward stroke for the insertion portion 11, and the avoidance portion 221 is separated from the side wall of the receiving groove 22 after the avoidance portion 221 has a set downward stroke.

[0044] Finally, it should be noted that the above are only preferred embodiments of the utility model and are not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A dead brake safety hook for an oil pump, comprising a safety hook body and a locking sleeve for cooperating with a dovetail groove stopper of a dead brake wheel, characterized in that: A receiving groove is provided on the side of the locking sleeve, and the safety hook body has an insertion portion that can enter and exit the receiving groove from the side, and the receiving groove includes a stop portion that matches at least a portion of the cross-section of the insertion portion and an avoidance portion located below the stop portion, and the stop portion is used to cooperate with the insertion portion in the up and down directions when the dead brake wheel is dead braked, and the avoidance portion is used to provide a stroke for the downward movement of the insertion portion so that the insertion portion is completely separated from the side wall of the receiving groove after a set downward stroke; the dead brake safety hook of the oil pump also includes a fixing structure for detachably fixing the locking sleeve and the insertion portion.

2. The dead brake safety hook of the oil pumping unit according to claim 1, characterized in that: The cross section of the protruding portion is a regular trapezoid.

3. The dead brake safety hook of the oil pumping unit as claimed in claim 2, characterized in that: The cross section of the locking sleeve is a regular trapezoid, and two waists on the cross section of the extending portion are respectively parallel to corresponding waists on the cross section of the locking sleeve.

4. The dead brake safety hook of the oil pumping unit as claimed in claim 2 or 3, characterized in that: The upper end of the accommodating groove is located on the upper surface of the lock sleeve and communicated with the outside.

5. The dead brake safety hook of the oil pumping unit according to any one of claims 1 to 3, characterized in that: One of the insertion part and the locking sleeve is provided with a fixing hole, and the other is provided with a long guide hole extending in the up-down direction. The insertion part and the locking sleeve are provided with a fixing piece that simultaneously penetrates the fixing hole and the long guide hole to prevent the insertion part from escaping from the side of the locking sleeve. The fixing piece, the fixing hole and the long guide hole constitute the fixing structure.

6. The dead brake safety hook of the oil pumping unit as claimed in claim 5, characterized in that: The fixing hole is arranged on the extending part, and the inner wall of the fixing hole is provided with an internal thread. The guide long hole is a through hole and is arranged on the locking sleeve. The fixing piece is a bolt, and the bolt is provided with an external thread matching the internal thread.

7. The dead brake safety hook of the oil pumping unit as claimed in claim 5, characterized in that: The fixing hole and the guide long hole are both through holes.

8. The dead brake safety hook of the oil pumping unit as claimed in claim 2 or 3, characterized in that: The cross section of the accommodating groove is a regular trapezoid.

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