Dead center cam self-locking locking device

Abstract

The utility model belongs to pumping unit safety locking technical field especially for dead -point cam self -locking type locking device, including support subassembly, locking ring, locking assembly, connecting component and drive assembly, drive assembly is connected with transmission piece drive, when drive assembly drives the cam lever rotates to preset angle, second tooth and first tooth are fully engaged, form self -locking, realize locking in the brake wheel arbitrary circumferential position, need not wait brake wheel rotation to specified angle, work efficiency is greatly promoted, when cam lever rotates to preset angle, second tooth and first tooth are fully engaged, form self -locking, avoid locking assembly to separate engagement, locking reliability is improved obviously, all movable parts are assembled on fixed support subassembly, do not contact with rotating brake wheel directly, pumping unit normal operation no friction, collision, eliminate the abnormal sound, guarantee equipment operation stability, can realize locking / unlocking through rotating handle, one person can operate.

Description

Technical Field

[0001] This utility model belongs to the field of oil pumping unit safety locking technology, specifically relating to a cam-type self-locking locking device without dead spots. Background Technology

[0002] During shutdown maintenance and routine shutdown operations, the brake wheel of the reducer must be braked and locked to ensure safety.

[0003] Existing traditional locking devices are fixed hook type, which have significant drawbacks: the locking operation can only be completed when the brake wheel rotates to a specific angle, which is not only cumbersome, but also increases the safety risk to the operator while waiting for the brake wheel to rotate to the specified angle; at the same time, some moving parts of traditional devices are directly installed on the rotating brake wheel, which can easily cause abnormal noise due to friction and collision of parts when the pumping unit is running, affecting the stability of equipment operation.

[0004] To address the aforementioned issues, this application proposes a dead-spot-free cam self-locking device. Utility Model Content

[0005] This utility model aims to solve the technical problems of existing fixed hook-type locking devices, such as limited locking angle, cumbersome and dangerous operation, easy generation of abnormal noise, and insufficient locking reliability. It provides a cam self-locking locking device that can lock the brake wheel at any position, is self-locking and safe, is easy to operate, and has no abnormal operating noise.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a self-locking locking device with a cam without dead spots, which is installed on the base of an oil pumping unit and is used to lock the brake wheel on the reducer, including a support component, a locking ring, a locking component, a connecting component and a drive component; The support assembly is used for fixed connection with the pumping unit base; The locking ring is fixed to the brake wheel so as to be coaxially linked with the brake wheel, and the outer peripheral wall of the locking ring is provided with first teeth continuously distributed along its circumference. The locking component is disposed on the support component and configured to swing relative to the locking ring, and the locking component has a second tooth that can engage with the first tooth; The connecting assembly includes a transmission component and a cam rod. The cam rod is rotatably mounted on the support assembly via the transmission component and slides in cooperation with the locking assembly, thereby converting the rotational motion of the cam rod into the oscillation of the locking assembly relative to the locking ring. The drive assembly is connected to the transmission component and is used to drive the transmission component to rotate. When the drive assembly drives the cam rod to rotate to a preset angle, the second tooth and the first tooth are fully engaged, and the outer periphery of the cam rod abuts against the limiting part on the locking assembly to form a self-locking mechanism.

[0007] Preferably, the support assembly includes a mounting base and a frame; The mounting base is used for fixed connection with the oil pumping unit base; The frame is fixedly connected to the mounting base, and the locking component, the connecting component and the driving component are all mounted on the frame.

[0008] Preferably, the locking assembly includes a base plate, a locking plate, a mounting rod, and a resilient reset component; The two substrates are symmetrically distributed and rotatably mounted on the frame using pins; The locking plate is disposed between the two base plates using two symmetrically distributed mounting rods, and the second tooth is fixed to the side of the locking plate facing the locking ring; Two symmetrically distributed arc-shaped waist holes are formed on the substrate, the mounting rod passes through the arc-shaped waist holes, and the center of the arc-shaped waist holes coincides with the axis of the brake wheel; Two elastic reset members are symmetrically distributed, and the distal ends of both elastic reset members are connected to the base plate, while the proximal ends are connected to the locking plate.

[0009] Preferably, it further includes a first connecting rod and a second connecting rod; Two first connecting rods are symmetrically fixed between the two substrates, and two second connecting rods are symmetrically fixed to the bottom surface of the locking plate. The elastic reset member is a tension spring, with one end of the tension spring hanging on the first connecting rod and the other end hanging on the second connecting rod.

[0010] Preferably, the transmission component of the connecting assembly includes an L-shaped rocker arm and a fixing rod; The bent part of the L-shaped rocker arm is rotatably mounted to the frame using a pin. The fixing rod is fixed to one end of the L-shaped rocker arm and the other end is connected to the drive assembly. The cam rod is fixed to the end of the fixing rod away from the L-shaped rocker arm.

[0011] Preferably, a long waist hole extending along its length direction is provided on the substrate, the cam rod passes through the long waist hole, and the inner end face of the long waist hole forms the limiting part. In the self-locking state, the corresponding half of the L-shaped rocker arm and the fixing rod are perpendicular to the length direction of the long waist hole, and the outer peripheral contour of the cam rod abuts against the inner end face of the long waist hole.

[0012] Preferably, the drive assembly includes a lead screw sleeve, a mounting sleeve, and a lead screw shaft; One end of the nut sleeve is rotatably connected to the end of the L-shaped rocker arm away from the fixed rod by a pin; The mounting sleeve is rotatably mounted to the frame using a pin. The lead screw shaft passes through the mounting sleeve to form a rotating structure, and the lead screw shaft is embedded in the lead screw sleeve to form a threaded engagement.

[0013] Preferably, the driving component further includes: A handle is fixed to the end of the lead screw shaft away from the lead screw sleeve.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. The first tooth of the locking ring is continuously distributed along the circumference. The locking component can be driven by the drive component to achieve the engagement of the second tooth with the first tooth at any circumferential position of the brake wheel. There is no need to wait for the brake wheel to rotate to a specified angle, which greatly improves the work efficiency. 2. When the cam rod rotates to the preset angle, the second tooth and the first tooth are fully engaged, and the outer periphery of the cam rod abuts against the limiting part on the locking component, forming a self-locking mechanism to prevent the locking component from disengaging, thus significantly improving the locking reliability. 3. All moving parts (locking components, connecting components, and drive components) are mounted on fixed support components and do not directly contact the rotating brake wheel. There is no friction or collision when the pumping unit is running normally, eliminating abnormal noise and ensuring the stability of equipment operation. 4. Locking / unlocking can be achieved by turning the handle, and it can be operated by a single person.

[0015] Other additional advantages and benefits of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the isometric structure of this utility model; Figure 3 This is an exploded view of the locking component in this utility model; Figure 4 This utility model Figure 2 A magnified schematic diagram of the connecting components in the diagram; Figure 5 This utility model Figure 2A magnified schematic diagram of the driving component in the diagram.

[0017] In the diagram: 1. Reducer; 2. Brake wheel; 3. Support assembly; 31. Mounting base; 32. Frame; 4. Locking ring; 41. First tooth; 5. Locking assembly; 51. Base plate; 511. Arc-shaped waist hole; 512. Long waist hole; 52. Locking plate; 521. Second tooth; 53. Mounting rod; 54. First connecting rod; 55. Second connecting rod; 56. Tension spring; 6. Connecting assembly; 61. L-shaped rocker arm; 62. Fixing rod; 63. Cam rod; 7. Drive assembly; 71. Nut sleeve; 72. Mounting sleeve; 73. Lead screw shaft; 74. Handle. Detailed Implementation

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

[0019] Please see Figures 1-5 The present invention provides the following technical solution: a self-locking locking device with no dead spot cam, which is installed on the base of the oil pumping unit and is used to lock the brake wheel 2 on the reducer 1. It includes a support component 3, a locking ring 4, a locking component 5, a connecting component 6 and a driving component 7.

[0020] Optionally, by Figure 1 and Figure 2As shown, in this embodiment, the support assembly 3 is used to be fixedly connected to the pumping unit base; the locking ring 4 is fixed to the brake wheel 2 to be coaxially linked with the brake wheel 2, and the outer peripheral wall of the locking ring 4 is provided with first teeth 41 continuously distributed along its circumferential direction; the locking assembly 5 is disposed on the support assembly 3 and configured to swing relative to the locking ring 4, and the locking assembly 5 has second teeth 521 that can mesh with the first teeth 41; the connecting assembly 6 includes a transmission component and a cam rod 63, the cam rod 63 is rotatably mounted on the support assembly 3 by means of the transmission component and slides in cooperation with the locking assembly 5, for converting the rotational motion of the cam rod 63 into the swinging motion of the locking assembly 5 relative to the locking ring 4; the driving assembly 7 is drivenly connected to the transmission component, for... When the drive assembly 7 drives the cam rod 63 to rotate to a preset angle, the second tooth 521 and the first tooth 41 are fully engaged, and the outer periphery of the cam rod 63 abuts against the limiting part on the locking assembly 5, forming a self-locking mechanism. With the above scheme, when the pumping unit needs to be stopped and the brake wheel 2 of the reducer 1 is locked, the drive assembly 7 establishes a drive connection with the transmission component in the connecting assembly 6, transmits power to the transmission component, and drives the transmission component to rotate around the mounting shaft on the support assembly 3. Since the cam rod 63 is mounted on the support assembly 3 through the rotation of the transmission component, the rotation of the transmission component will directly drive the cam rod 63 to rotate synchronously. At this time, the cam rod 63 enters the preset rotation stroke.

[0021] As the cam rod 63 rotates, its specially designed outer peripheral contour slides into contact with the locking component 5. During the sliding process, the contour curve of the cam rod 63 will generate a continuous thrust on the locking component 5. This thrust will be converted into a torque that drives the locking component 5 to swing around the hinge point on the support component 3. Under the action of the torque, the locking component 5 gradually swings towards the locking ring 4, and the second tooth 521 at its end begins to contact the first tooth 41 on the outer peripheral wall of the locking ring 4.

[0022] The drive assembly 7 continues to provide power, and the cam rod 63 continues to rotate, pushing the locking assembly 5 to swing further, so that the meshing depth of the second tooth 521 and the first tooth 41 continuously increases. When the cam rod 63 rotates to the preset angle, the second tooth 521 and the first tooth 41 are fully meshed. At this time, the locking ring 4 is firmly locked by the locking assembly 5. Since the locking ring 4 is fixedly connected to the brake wheel 2 and coaxially linked, the brake wheel 2 is also locked and can no longer rotate, thereby achieving braking and locking of the reducer 1.

[0023] Meanwhile, when the cam rod 63 rotates to the preset angle, its outer circumferential contour forms a tight contact with the limiting part on the locking component 5. At this time, the cam rod 63 is in a self-locking state. Even under the action of external load or vibration, the reaction force generated by the locking component 5 on the cam rod 63 will be offset by the contour structure of the cam rod 63, and it will not be able to push the cam rod 63 to rotate in the opposite direction. Therefore, the self-locking structure ensures that the meshing state between the locking component 5 and the locking ring 4 can be stably maintained, effectively avoiding the situation of accidental unlocking of the locking device during use, and ensuring the safety and stability of the pumping unit in the shutdown state.

[0024] When it is necessary to unlock, the drive assembly 7 rotates in reverse, causing the transmission component and cam rod 63 to rotate in the opposite direction. The resistance of the cam rod 63 to the locking assembly 5 gradually disappears, and the locking assembly 5 swings in the opposite direction. The second tooth 521 gradually disengages from the first tooth 41 until it is completely separated. At this time, the brake wheel 2 returns to a free rotation state, and the locking device completes the unlocking action.

[0025] Optionally, by Figure 1 and Figure 2 As shown in this embodiment, the support component 3 includes a mounting base 31 and a frame 32. The mounting base 31 is used to be fixedly connected to the pumping unit base. The frame 32 is fixedly connected to the mounting base 31. The locking component 5, the connecting component 6, and the driving component 7 are all mounted on the frame 32. With the above solution, when in use, the mounting base 31 has a pre-set fixing hole position, and is rigidly connected to the pumping unit base by fasteners such as bolts, ensuring that the mounting base 31 fits tightly with the base without loosening, providing a stable bottom support for the entire locking device.

[0026] The frame 32 is fixed to the mounting base 31 by welding or high-strength bolts, so that the frame 32 forms a vertical or preset angle load-bearing frame. Finally, the locking component 5, the connecting component 6 and the driving component 7 are installed in the corresponding assembly positions of the frame 32.

[0027] Optionally, by Figures 1-3 As shown, in this embodiment, the locking assembly 5 includes a base plate 51, a locking plate 52, a mounting rod 53, and an elastic reset member; the two base plates 51 are symmetrically distributed and rotatably mounted on the frame 32 using a pin; the locking plate 52 is disposed between the two base plates 51 using two symmetrically distributed mounting rods 53, and the second tooth 521 is fixed to the side of the locking plate 52 facing the locking ring 4; two symmetrically distributed arc-shaped waist holes 511 are opened on the base plate 51, the mounting rod 53 passes through the arc-shaped waist holes 511, and the center of the arc-shaped waist holes 511 coincides with the axis of the brake wheel 2; the two elastic reset members are symmetrically distributed, and the far ends of the two elastic reset members are connected to the base plate 51, and the near ends are connected to the locking plate 52. With the above scheme, when the drive assembly 7 drives the cam rod 63 to rotate during use, the cam rod 63 pushes the two base plates 51 to swing synchronously around the pin towards the locking ring 4.

[0028] Since the locking plate 52 is provided between the two base plates 51 by using two symmetrically distributed mounting rods 53, when the base plate 51 swings, it will synchronously drive the locking plate 52 to swing towards the locking ring 4. At this time, the second tooth 521 of the locking plate 52 facing the locking ring 4 gradually approaches the first tooth 41 of the locking ring 4.

[0029] During this process, if there is a slight angular deviation between the first tooth 41 and the second tooth 521, the two symmetrically distributed elastic reset members (connecting the base plate 51 and the locking plate 52) are stretched when the first tooth 41 and the second tooth 521 come into contact (one elastic reset member is stretched and the other elastic reset member is contracted), generating a reverse pulling force. The locking plate 52 drives the mounting rod 53 to move along the arc-shaped waist hole 511. This pulling force can buffer the moving speed of the locking plate 52 and prevent the second tooth 521 from having a rigid collision with the first tooth 41.

[0030] At the same time, the two elastic reset members have the same elastic force, which has a balancing effect in the initial state, ensuring that the locking plate 52 is always in the middle position relative to the length direction of the base plate 51.

[0031] Optionally, by Figures 1-3 As shown, this embodiment also includes a first connecting rod 54 and a second connecting rod 55; the two first connecting rods 54 are symmetrically fixed between the two base plates 51, and the two second connecting rods 55 are symmetrically fixed to the bottom surface of the locking plate 52. The elastic reset element is a tension spring 56, with one end of the tension spring 56 hanging on the first connecting rod 54 and the other end hanging on the second connecting rod 55. With the above scheme, in use, the first connecting rod 54 and the second connecting rod 55 serve as the mounting base for the tension spring 56, ensuring the stability of the tension spring 56 installation.

[0032] During installation, the distance between the first connecting rod 54 and the second connecting rod 55 on both sides is equal, and the elastic force and installation height of the two elastic reset members are the same, ensuring that the locking plate 52 is always in the middle position relative to the length direction of the base plate 51 in the initial state.

[0033] Optionally, by Figures 1-4As shown, in this embodiment, the transmission component of the connecting assembly 6 includes an L-shaped rocker arm 61 and a fixing rod 62; the bent part of the L-shaped rocker arm 61 is rotatably mounted on the frame 32 by a pin; the fixing rod 62 is fixed to one end of the L-shaped rocker arm 61, and the other end is connected to the drive assembly 7; the cam rod 63 is fixed to the end of the fixing rod 62 away from the L-shaped rocker arm 61; a long slotted hole 512 extending along its length direction is provided on the base plate 51; the cam rod 63 passes through the long slotted hole 512, and the inner end face of the long slotted hole 512 forms a limiting part, which is in a self-locking state. Below, the corresponding half of the L-shaped rocker arm 61 and the fixed rod 62 are perpendicular to the length direction of the long waist hole 512, and the outer periphery of the cam rod 63 abuts against the inner end face of the long waist hole 512. With the above scheme, when the pumping unit starts the shutdown locking program, the drive component 7 is operated, the drive component 7 outputs power, and pushes the L-shaped rocker arm 61 to rotate around the hinge point. The L-shaped rocker arm 61 pushes the fixed rod 62 to rotate, and the fixed rod 62 drives the cam rod 63 to make a circular motion around the hinge point between the L-shaped rocker arm 61 and the frame 32.

[0034] Since the cam rod 63 passes through the elongated slot 512 extending along the length direction on the substrate 51, when the cam rod 63 rotates, it will move along the elongated slot 512 and push the substrate 51 to rotate towards the locking ring 4, and the first tooth 41 and the second tooth 521 gradually mesh.

[0035] As the driving assembly 7 continues to apply force, the rotation angle of the L-shaped rocker arm 61 and the fixed rod 62 continuously increases. When the second tooth 521 of the locking plate 52 is fully engaged with the first tooth 41 of the locking ring 4, the corresponding half of the L-shaped rocker arm 61 (the side closest to the fixed rod 62) and the fixed rod 62 are exactly perpendicular to the length direction of the elongated hole 512. At this time, the outer periphery of the cam rod 63 is in close contact with the inner end face of the elongated hole 512, entering a self-locking state. If the brake wheel 2 generates reverse torque, it will pass through the locking ring 4, The locking plate 52 and mounting rod 53 are transmitted to the base plate 51, so that the inner end face of the elongated hole 512 generates a reaction force along the length of the elongated hole 512 towards the cam rod 63. Since the fixing rod 62 is perpendicular to the elongated hole 512, the reaction force is along the radial direction of the fixing rod 62 and cannot push the L-shaped rocker arm 61 and the fixing rod 62 to rotate in the opposite direction (the radial force does not generate torque on the hinge point), thereby firmly locking the position of the cam rod 63, ensuring stable engagement, and at this time the drive assembly 7 is not under force, improving the safety of the locking device system.

[0036] Optionally, by Figures 1-5As shown, in this embodiment, the drive assembly 7 includes a screw thread sleeve 71, a mounting sleeve 72, a screw shaft 73, and a handle 74. One end of the screw thread sleeve 71 is rotatably connected to the end of the L-shaped rocker arm 61 away from the fixed rod 62 via a pin. The mounting sleeve 72 is rotatably mounted on the frame 32 via a pin. The screw shaft 73 passes through the mounting sleeve 72 to form a rotating structure, and the screw shaft 73 is embedded in the screw thread sleeve 71 to form a threaded fit. The handle 74 is fixed to the end of the screw shaft 73 away from the screw thread sleeve 71. With the above solution, when the pumping unit needs to be stopped and locked during use, the operator rotates the handle 74 to drive the screw shaft 73 to rotate around its own axis. The mounting sleeve 72 provides stable rotational support for the screw shaft 73, ensuring the stability of the screw shaft 73.

[0037] When the lead screw shaft 73 rotates, its external thread and the internal thread of the embedded lead screw sleeve 71 form a threaded transmission engagement, converting the rotational motion input by the handle 74 into the linear motion of the lead screw sleeve 71. Since one end of the lead screw sleeve 71 is rotatably connected to the end of the L-shaped rocker arm 61 away from the fixed rod 62 through a pin, and the bent part of the L-shaped rocker arm 61 is hinged to the frame 32, the linear movement of the lead screw sleeve 71 will generate a thrust along its length on the L-shaped rocker arm 61, driving the L-shaped rocker arm 61 to swing around the hinge point on the frame 32 toward the locking ring 4.

[0038] While the L-shaped rocker arm 61 swings, the fixed rod 62 fixed at its other end moves in an arc around the hinge point, causing the cam rod 63 fixed at the end of the fixed rod 62 to rotate. The cam rod 63 passes through the elongated hole 512 on the base plate 51. During the rotation, its outer peripheral wall gradually contacts the inner end face of the elongated hole 512 near the locking ring 4 and applies force, pushing the two base plates 51 to swing around the pin axis of the frame 32 towards the locking ring 4.

[0039] The arc-shaped waist hole 511 on the substrate 51 moves with the swing, causing the mounting rod 53 to slide, which in turn pulls the locking plate 52 closer to the locking ring 4, and the second tooth 521 gradually engages with the first tooth 41.

[0040] The operator continuously rotates the handle 74, and the lead screw shaft 73 continuously pushes the lead screw sleeve 71 forward through the threaded transmission. The swing angle of the L-shaped rocker arm 61 increases, and the thrust of the cam rod 63 on the elongated hole 512 is enhanced. When the second tooth 521 is fully engaged with the first tooth 41, the corresponding half of the L-shaped rocker arm 61 and the fixed rod 62 are perpendicular to the length direction of the elongated hole 512. The outer circumference of the cam rod 63 is in close contact with the inner end face of the elongated hole 512, forming a mechanical self-lock. At this time, the drive component 7 is not under force, which improves the safety of the locking device system. At the same time, the threaded engagement between the lead screw shaft 73 and the lead screw sleeve 71 has a reverse self-locking characteristic (that is, when there is no external force driving the handle 74, the lead screw sleeve 71 cannot push the lead screw shaft 73 to rotate in the reverse direction), which further strengthens the locking posture of the L-shaped rocker arm 61. The double self-locking ensures that the brake wheel 2 is stably locked, avoids accidental unlocking, and realizes the locking of the brake wheel 2 when it stops at any position.

[0041] During unlocking, the operator rotates the handle 74 in the opposite direction, causing the lead screw shaft 73 to rotate in the opposite direction. This pulls the nut sleeve 71 backward through the threaded transmission, which in turn causes the L-shaped rocker arm 61 to swing in the opposite direction around the hinge point of the frame 32. The cam rod 63 rotates with the fixed rod 62 and disengages from the inner end face of the elongated hole 512, pulling the base plate 51 to swing in the opposite direction. The second tooth 521 separates from the first tooth 41. When the handle 74 returns to its initial position, the lead screw shaft 73 and the nut sleeve 71 reset, and the cam rod 63 returns to its initial state in the elongated hole 512. The brake wheel 2 resumes free rotation, and the entire device is unlocked.

[0042] Components not described in detail in this article are existing technologies.

[0043] The working principle and usage process of this utility model: In use, the mounting base 31 of this utility model has a fixed hole position, which is rigidly connected to the pumping unit base by fasteners such as bolts, ensuring that the mounting base 31 fits tightly with the base without loosening, providing a stable bottom support for the entire locking device. The reducer 1 is also fixed on the pumping unit base. When the pumping unit needs to be stopped and the brake wheel 2 of the reducer 1 is locked, the operator turns the handle 74, which drives the lead screw shaft 73 to rotate around its own axis. The mounting sleeve 72 provides stable rotational support for the lead screw shaft 73, ensuring the stability of the lead screw shaft 73. When the lead screw shaft 73 rotates, its external thread and the internal thread of the embedded lead screw sleeve 71 form a threaded transmission engagement, converting the rotational motion input by the handle 74 into the linear motion of the lead screw sleeve 71. Since one end of the lead screw sleeve 71 is rotatably connected to the end of the L-shaped rocker arm 61 away from the fixed rod 62 through a pin, and the bent part of the L-shaped rocker arm 61 is hinged to the frame 32, the linear movement of the lead screw sleeve 71 will generate a thrust along its length on the L-shaped rocker arm 61, driving the L-shaped rocker arm 61 to swing around the hinge point on the frame 32 toward the locking ring 4. While the L-shaped rocker arm 61 swings, the fixed rod 62 fixed at its other end moves in an arc around the hinge point, causing the cam rod 63 fixed at the end of the fixed rod 62 to rotate. The cam rod 63 passes through the elongated hole 512 on the base plate 51. During the rotation, its outer peripheral wall gradually contacts the inner end face of the elongated hole 512 near the locking ring 4 and applies force, pushing the two base plates 51 to swing around the pin axis of the frame 32 towards the locking ring 4. The arc-shaped waist hole 511 on the substrate 51 moves with the swing, causing the mounting rod 53 to slide, thereby pulling the locking plate 52 closer to the locking ring 4, and the second tooth 521 gradually engages with the first tooth 41; During this process, if there is a slight angular deviation between the first tooth 41 and the second tooth 521, the two symmetrically distributed tension springs 56 (connecting the base plate 51 and the locking plate 52) are stretched when the first tooth 41 and the second tooth 521 come into contact (one tension spring 56 is stretched and the other tension spring 56 is contracted), generating a reverse tension force. The locking plate 52 drives the mounting rod 53 to move along the arc-shaped waist hole 511. This tension force can buffer the moving speed of the locking plate 52 and prevent the second tooth 521 from having a rigid collision with the first tooth 41. At the same time, the two tension springs 56 have the same elastic force, which has a balancing effect in the initial state, ensuring that the locking plate 52 is always in the middle position relative to the length direction of the base plate 51. The operator continuously rotates the handle 74, and the lead screw shaft 73 continuously pushes the lead screw sleeve 71 forward through the threaded transmission. The swing angle of the L-shaped rocker arm 61 increases, and the thrust of the cam rod 63 on the long waist hole 512 is enhanced. When the second tooth 521 is fully engaged with the first tooth 41, the corresponding half of the L-shaped rocker arm 61 and the fixed rod 62 are perpendicular to the length direction of the long waist hole 512. The outer circumference of the cam rod 63 is in close contact with the inner end face of the long waist hole 512, forming a mechanical self-lock. At this time, the drive component 7 is not under force, which improves the safety of the locking device system. At the same time, the threaded engagement between the lead screw shaft 73 and the lead screw sleeve 71 has a reverse self-locking characteristic (that is, when there is no external force driving the handle 74, the lead screw sleeve 71 cannot push the lead screw shaft 73 to rotate in the reverse direction), which further strengthens the locking posture of the L-shaped rocker arm 61. The double self-locking ensures that the brake wheel 2 is stably locked, avoids accidental unlocking, and realizes the locking of the brake wheel 2 when it stops at any position. During unlocking, the operator rotates the handle 74 in the opposite direction, causing the lead screw shaft 73 to rotate in the opposite direction. This pulls the nut sleeve 71 backward through the threaded transmission, which in turn causes the L-shaped rocker arm 61 to swing in the opposite direction around the hinge point of the frame 32. The cam rod 63 rotates with the fixed rod 62 and disengages from the inner end face of the elongated hole 512, pulling the base plate 51 to swing in the opposite direction. The second tooth 521 separates from the first tooth 41. When the handle 74 returns to its initial position, the lead screw shaft 73 and the nut sleeve 71 reset, and the cam rod 63 returns to its initial state in the elongated hole 512. The brake wheel 2 resumes free rotation, and the entire device is unlocked.

[0044] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is 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 or make equivalent substitutions for some of the technical features. 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 self-locking cam locking device with no dead spot, mounted on the base of an oil pumping unit, used to lock the brake wheel (2) on the reducer (1), characterized in that, It includes a support component (3), a locking ring (4), a locking component (5), a connecting component (6), and a drive component (7); The support component (3) is used for fixed connection with the pumping unit base; The locking ring (4) is fixed to the brake wheel (2) so as to be coaxially linked with the brake wheel (2), and the outer peripheral wall of the locking ring (4) is provided with first teeth (41) continuously distributed along its circumferential direction. The locking component (5) is disposed on the support component (3) and configured to swing relative to the locking ring (4), and the locking component (5) has a second tooth (521) that can engage with the first tooth (41). The connecting component (6) includes a transmission component and a cam rod (63). The cam rod (63) is rotatably mounted on the support component (3) by means of the transmission component and slides in cooperation with the locking component (5) to convert the rotational motion of the cam rod (63) into the swing of the locking component (5) relative to the locking ring (4). The drive assembly (7) is connected to the transmission component and is used to drive the transmission component to rotate. When the drive assembly (7) drives the cam rod (63) to rotate to a preset angle, the second tooth (521) is fully engaged with the first tooth (41), and the outer periphery of the cam rod (63) abuts against the limiting part on the locking assembly (5) to form a self-locking mechanism.

2. The self-locking locking device for a cam without dead spots according to claim 1, characterized in that: The support assembly (3) includes a mounting base (31) and a frame (32); The mounting base (31) is used for fixed connection with the pumping unit base; The frame (32) is fixedly connected to the mounting base (31), and the locking component (5), the connecting component (6) and the driving component (7) are all mounted on the frame (32).

3. The dead-spot-free cam self-locking device according to claim 2, characterized in that: The locking assembly (5) includes a base plate (51), a locking plate (52), a mounting rod (53), and an elastic reset component; The two substrates (51) are symmetrically distributed and rotatably mounted on the frame (32) using pins; The locking plate (52) is provided between the two base plates (51) by means of two symmetrically distributed mounting rods (53), and the second tooth (521) is fixed to the side of the locking plate (52) facing the locking ring (4); Two symmetrically distributed arc-shaped waist holes (511) are provided on the substrate (51), the mounting rod (53) passes through the arc-shaped waist holes (511), and the center of the arc-shaped waist holes (511) coincides with the axis of the brake wheel (2); Two elastic reset members are symmetrically distributed, and the far ends of the two elastic reset members are connected to the base plate (51), and the near ends are connected to the locking plate (52).

4. The dead-spot-free cam self-locking device according to claim 3, characterized in that: It also includes a first connecting rod (54) and a second connecting rod (55); Two first connecting rods (54) are symmetrically fixed between two base plates (51), and two second connecting rods (55) are symmetrically fixed to the bottom surface of the locking plate (52). The elastic reset member is a tension spring (56), and one end of the tension spring (56) is hung on the first connecting rod (54) and the other end is hung on the second connecting rod (55).

5. The dead-spot-free cam self-locking device according to claim 3, characterized in that: The transmission components of the connecting assembly (6) include an L-shaped rocker arm (61) and a fixing rod (62). The bent part of the L-shaped rocker arm (61) is rotatably mounted on the frame (32) by means of a pin. The fixing rod (62) is fixed to one end of the L-shaped rocker arm (61) and the other end is connected to the drive assembly (7). The cam rod (63) is fixed to the end of the fixing rod (62) away from the L-shaped rocker arm (61).

6. The dead-spot-free cam self-locking device according to claim 5, characterized in that: An elongated slotted hole (512) extending along its length direction is provided on the substrate (51). The cam rod (63) passes through the elongated slotted hole (512), and the inner end face of the elongated slotted hole (512) forms the limiting part. In the self-locking state, the corresponding half of the L-shaped rocker arm (61) and the fixing rod (62) are perpendicular to the length direction of the elongated slotted hole (512), and the outer periphery of the cam rod (63) abuts against the inner end face of the elongated slotted hole (512).

7. The dead-spot-free cam self-locking device according to claim 5, characterized in that: The drive assembly (7) includes a lead screw sleeve (71), a mounting sleeve (72), and a lead screw shaft (73). One end of the nut sleeve (71) is rotatably connected to the end of the L-shaped rocker arm (61) away from the fixed rod (62) by means of a pin; The mounting sleeve (72) is rotatably mounted on the frame (32) using a pin. The lead screw shaft (73) passes through the mounting sleeve (72) to form a rotating structure, and the lead screw shaft (73) is embedded in the lead screw sleeve (71) to form a threaded fit.

8. The dead-spot-free cam self-locking device according to claim 7, characterized in that: The driving component (7) also includes: A handle (74) is fixed to one end of the lead screw shaft (73) away from the lead screw sleeve (71).

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