Metering pump stroke controller clutch handwheel mechanism with overload protection

Abstract

The application relates to a metering pump stroke controller clutch hand wheel mechanism with an overload protection function. The hand wheel is fixedly arranged with a hand wheel positioning shaft, a hand wheel supporting seat is arranged below the hand wheel positioning shaft, a pull rod seat B is screw-connected with the upper end of the hand wheel positioning shaft, a pull rod seat A is arranged above the pull rod seat B, and the pull rod seat A is screw-connected with a handle; the pull rod is arranged in the hand wheel positioning shaft, the pull rod and the lower end of the hand wheel positioning shaft are inserted into a toothed clutch A, a toothed clutch B is arranged below the toothed clutch A, and the toothed clutch A can be driven to move upwards along the long slot hole of the hand wheel positioning shaft when the pull rod moves upwards; a spring is arranged between the shaft shoulder of the hand wheel positioning shaft and the toothed clutch A. Through the ingenious structural design, when any part of the body of an operator collides with the hand wheel, the clutch of the hand wheel is immediately separated from the spring mechanism, so that the operator is well protected from being hurt, and the operation is simple and reliable.

Description

Technical Field

[0001] This invention relates to a metering pump stroke controller clutch handwheel mechanism with overload protection function. Background Technology

[0002] Many metering pump stroke controllers are generally equipped with a manual operating handwheel with a clutch mechanism. This is to allow for manual operation of the metering pump stroke controller in situations where, due to non-process reasons (such as instrument air supply failure, motor failure, positioner failure, 4~20mA signal line failure, or DCS output failure), the controller cannot be remotely operated from the main control room, but the process should not be interrupted. Alternatively, under certain special operating conditions, the handwheel can be combined with the stroke adjustment mechanism via the clutch to manually operate the metering pump stroke controller on-site for process flow debugging or to ensure long-term equipment operation. Furthermore, in emergency situations, the handwheel can be used to prevent equipment accidents or to prevent the escalation of accidents under abnormal operating conditions.

[0003] As metering pump stroke controllers gradually experience more failure factors due to their service life, and in order to strive for the goal of long-term safe operation, the possibility of manually operating metering pump stroke controllers is increasing.

[0004] Currently, when the handwheel and clutch of the metering pump stroke controller are used together, the handwheel will rotate along with the adjustment mechanism if the clutch malfunctions or the operator uses it improperly, posing a great threat to the operator's life safety. Therefore, there is an urgent need in the market for a clutch handwheel mechanism with overload protection function. Summary of the Invention

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide a technical solution for a metering pump stroke controller clutch handwheel mechanism with overload protection function.

[0006] The overload protection function of the metering pump stroke controller clutch handwheel mechanism is characterized by comprising a handle, a handwheel, a pull rod seat A, a pull rod seat B, a handwheel support seat, a handwheel positioning shaft, a jaw clutch A, a jaw clutch B, and a pull rod. The handwheel is fixedly mounted to the handwheel positioning shaft, and a handwheel support seat is provided below the handwheel positioning shaft. A bearing is provided between the handwheel positioning shaft and the handwheel support seat, allowing the handwheel positioning shaft to rotate within the handwheel support seat. A longitudinal gap is provided between the handwheel and the handwheel support seat to prevent them from contacting each other. The upper end of the handwheel positioning shaft is screwed to the pull rod seat B, which is embedded in the handwheel. The pull rod seat A is mounted above the pull rod seat B and screwed to the handle. The pull rod is located within the handwheel positioning shaft, and its upper end passes through the pull rod seat A and is secured by a nut. A jaw clutch A is inserted into the lower end of a fixed lever and a handwheel positioning shaft. A jaw clutch B is fitted below jaw clutch A. The handwheel positioning shaft and jaw clutch A have gaps in both the lateral and longitudinal directions, allowing jaw clutch A to move up and down along the handwheel positioning shaft. A small hole is provided at the lower end of the lever, a horizontal hole is provided on jaw clutch A, and a long slot is provided at the lower end of the handwheel positioning shaft. Hex socket screws pass through the horizontal hole, the small hole, and the long slot in sequence to fix jaw clutch A and lever to the handwheel positioning shaft. When the lever moves upward, it can drive jaw clutch A to move upward along the long slot of the handwheel positioning shaft. A protruding shoulder is provided at the bearing mounting location of the handwheel positioning shaft, and a spring is installed between the shoulder and jaw clutch A, with the spring sleeved on the handwheel positioning shaft.

[0007] The metering pump stroke controller clutch handwheel mechanism with overload protection function is characterized in that two convex ribs are provided on the lower end face of the pull rod seat A, and a first convex rib groove and a second convex rib groove matching the convex ribs are provided on the top end of the pull rod seat B. The first convex rib groove and the second convex rib groove are distributed at 90 degrees, and the height difference between the first convex rib groove and the second convex rib groove is greater than the height of the triangular helical teeth of the jaw clutch A.

[0008] The metering pump stroke controller clutch handwheel mechanism with overload protection function is characterized in that the length of the long slot is greater than the height of the rib.

[0009] The metering pump stroke controller clutch handwheel mechanism with overload protection function is characterized in that the lower end face of the jaw clutch A and the upper end face of the jaw clutch B are provided with mutually meshing jaw clutch triangular helical teeth, the jaw clutch A and the jaw clutch B have the same module and number of teeth, and the lower center of the jaw clutch B is provided with an output shaft to transmit output power.

[0010] The metering pump stroke controller clutch handwheel mechanism with overload protection function is characterized in that a shaft retainer is provided on the upper end face of the inner ring of the bearing, and a hole retainer spring is provided on the lower end face of the outer ring of the bearing.

[0011] The metering pump stroke controller clutch handwheel mechanism with overload protection function is characterized in that the handwheel support seat is provided with bolt holes on the circumference, and the bolt holes are used in conjunction with bolts to connect the handwheel mechanism and external equipment.

[0012] Through its ingenious structural design, this invention ensures that when any part of the operator's body touches the handwheel, the clutch of the handwheel immediately disengages via a spring mechanism, thus effectively protecting the operator from injury. Furthermore, the handwheel clutch mechanism of this invention is quite simple to operate and highly reliable. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the clutch in the engaged state of the present invention;

[0014] Figure 2 This is a cross-sectional view of the clutch in the disengaged state of the present invention;

[0015] Figure 3 This is a three-dimensional schematic diagram of the tooth clutch A described above;

[0016] Figure 4 This is a three-dimensional schematic diagram of the jaw clutch B described above;

[0017] Figure 5 This is a three-dimensional schematic diagram of the pull rod seat B.

[0018] Figure 6 This is a three-dimensional schematic diagram of the pull rod seat A.

[0019] Figure 7 This is a three-dimensional sectional view of the handwheel positioning shaft.

[0020] In the diagram: 1. Handle, 2. Nut, 3. Handwheel, 4. Pull rod seat A, 5. Pull rod seat B, 6. Bearing, 7. Handwheel support seat, 8. Hole snap ring, 9. Spring, 10. Socket head screw, 11. Handwheel positioning shaft, 12. Jaw clutch A, 13. Jaw clutch B, 14. Output shaft, 15. Pull rod, 16. Shaft clip, 17. Set screw, 18. Long slot hole, 19. Rib, 20. First rib groove, 21. Second rib groove, 22. Jaw clutch triangular helical teeth. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] The present invention includes a handle 1, a handwheel 3, a lever seat A4, a lever seat B5, a handwheel support seat 7, a handwheel positioning shaft 11, a jaw clutch A12, a jaw clutch B13, and a lever 15. The handwheel 3 is limited above the handwheel positioning shaft 11 by a set screw 17 to prevent it from rotating or moving up and down. The handwheel support seat 7 is provided below the handwheel positioning shaft 11. A bearing is provided between the handwheel positioning shaft 11 and the handwheel support seat 7. The handwheel positioning shaft 11 can rotate within the handwheel support seat 7. The handwheel 3 and the handwheel support seat 7 are longitudinally spaced to ensure that the handwheel 3 and the handwheel support seat 7 do not come into contact.

[0023] In this invention, the upper end of the handwheel positioning shaft 11 is screwed into a pull rod seat B13, which is embedded in the handwheel 3. A pull rod seat A4 is fitted above the pull rod seat B5, and the external thread of the pull rod seat A5 is screwed into the handle 1. The pull rod 15 is disposed inside the handwheel positioning shaft 11, and its upper end passes through the pull rod seat A4 and is fixed by a nut 2. The lower ends of the pull rod 15 and the handwheel positioning shaft 11 are inserted into a jaw clutch A12, which is fitted below the jaw clutch A12. The handwheel positioning shaft 11 and the jaw clutch A12 have gaps in both the lateral and longitudinal directions, allowing the jaw clutch A12 to move up and down along the handwheel positioning shaft 11. A small hole is provided at the lower end of the pull rod 15, a horizontal hole is provided on the jaw clutch A12, and a long slot 18 is provided at the lower end of the handwheel positioning shaft 11. The hex socket screw 10 passes through the horizontal hole, the small hole, and the long slot 18 in sequence to fix the jaw clutch A12 and the pull rod 15 to the handwheel positioning shaft 11. When the pull rod 15 moves upward, it can drive the jaw clutch A12 to move upward along the long slot 18 of the handwheel positioning shaft. The handwheel positioning shaft 11 has a protruding shoulder at the bearing mounting location. A spring 9 is set between the shoulder and the jaw clutch A12. The spring 9 is sleeved on the handwheel positioning shaft 11. The jaw clutch A12 can pull the pull rod 15 in the long slot 18 of the handwheel positioning shaft 11 to compress the spring 9 and slide up and down. When the pull rod 15 is released, the spring 9 will slide the jaw clutch A12 back to the lower limit of the long slot of the handwheel positioning shaft 11 by the pre-tightened spring force. The spring 9 can be adjusted by increasing or decreasing the spring tension by means of shims or other means according to the user's rotation output force requirements.

[0024] The lower end face of the jaw clutch A12 and the upper end face of the jaw clutch B13 of the present invention are provided with mutually meshing jaw clutch triangular helical teeth 22. The jaw clutch A12 and the jaw clutch B13 have the same module and number of teeth. The lower center of the jaw clutch B13 is provided with an output shaft 14 to transmit output power.

[0025] The lower end face of the pull rod seat A4 of this invention is provided with two raised ribs 19, and the top end of the pull rod seat B5 is provided with a first raised rib groove 20 and a second raised rib groove 21 that match the raised ribs. The first raised rib groove 20 and the second raised rib groove 21 are distributed at 90 degrees. The height difference between the first raised rib groove 20 and the second raised rib groove 21 is greater than the height of the triangular helical teeth of the jaw clutch A12, and the length of the long slot 18 is greater than the height of the raised ribs 19. During normal operation, the raised ribs 19 are located in the first raised rib groove 20, and the jaw clutch A12 is engaged with the jaw clutch B13, transmitting power to the output shaft 14 through the jaw clutch B13. When there is an abnormality, pulling up and turning the handle will move the raised rib from the first raised rib groove to the second raised rib groove 21. At the same time, pulling up the handle will drive the pull rod 15 to move upward, thereby disengaging the jaw clutch A12 from the jaw clutch B13, blocking the power transmission between the handwheel mechanism and the output shaft.

[0026] In this invention, a shaft retainer 16 is provided on the upper end face of the inner ring of the bearing 6, and a retaining ring 8 is provided on the lower end face of the outer ring of the bearing 6. The center of the handwheel positioning shaft 11 passes through the inner diameter of the bearing 6. The inner ring of the lower end face of the bearing 6 is connected to the shoulder of the handwheel positioning shaft 11. The outer ring of the lower end face of the bearing 6 is in contact with the end face of the retaining ring 8 for positioning. The outer ring of the retaining ring 8 is pressed against the retaining ring hole provided in the handwheel support seat 7. The bearing 6 passes through the shaft hole provided in the handwheel support seat 7. The upper end face of the inner ring of the bearing 6 is in contact with the shaft retainer 16 for positioning. The upper end face of the outer ring of the bearing 6 is in contact with the end face of the shaft hole provided in the handwheel support seat 7 for positioning. The handwheel support seat 7 and the bearing 6 limit the handwheel positioning shaft 11, so that the handwheel positioning shaft 11 can only rotate around its central axis.

[0027] The handwheel support base 7 of this invention has bolt holes around its circumference. The bolt holes, when used with bolts, allow the handwheel mechanism to be used in conjunction with external equipment.

[0028] The specific working principle of this invention is as follows:

[0029] The operator manually rotates the handwheel, which transmits power to the output shaft 14 via the mechanism clutch. The output shaft 14 then transmits the power to the user's adjustment mechanism.

[0030] The engagement friction between the jaw clutches A12 and B13 is determined by the angle of the jaw clutch triangular helical teeth and the spring preload of spring 9. The greater the spring preload, the greater the engagement friction between jaw clutches A12 and B13; the larger the angle of the jaw clutch triangular helical teeth, the stronger the clutch's power transmission capacity. After calculation and adjustment to suitable parameters based on human tolerance, when the output shaft 14 rotates around its own center under motor power, and simultaneously, due to clutch malfunction or improper operation, the handwheel will rotate along with the adjustment mechanism. If any part of the operator's body touches the adjustment handwheel, and the friction between the body and the handwheel exceeds the friction of the jaw clutch triangular helical teeth, jaw clutch A12 will slide upwards along the handwheel positioning shaft 11 and the provided long slot, overcoming the spring preload of spring 9, and the clutch will automatically disengage, thus protecting the operator from injury.

[0031] When the operator needs to disengage the clutch and cut off the power transmission between the handwheel and the output shaft, simply grasp the handle, overcome the spring preload, and pull the handle to move the lever 15 a certain distance (i.e., disengage the rib from the first rib groove). Then rotate the handle 90 degrees to engage the rib on the lower end face of the lever seat A4 with the second rib groove, thereby disengaging the jaw clutch A from the jaw clutch B and disengaging the transmission mechanism (because the height difference between the first rib groove 20 and the second rib groove 21 is greater than the height of the jaw clutch triangular helical teeth of the jaw clutch A12).

Claims

1. A stroke controller clutch handwheel mechanism for a metering pump having an overload protection function, characterized in that The handle, hand wheel, pull rod seat A, pull rod seat B, hand wheel support seat, hand wheel positioning shaft, toothed clutch A, toothed clutch B and pull rod are included, the hand wheel is fixedly arranged with the hand wheel positioning shaft, the hand wheel support seat is arranged below the hand wheel positioning shaft, bearings are arranged between the hand wheel positioning shaft and the hand wheel support seat, the hand wheel positioning shaft can rotate in the hand wheel support seat, the longitudinal direction of the hand wheel and the hand wheel support seat is provided with a gap, so that the hand wheel and the hand wheel support seat are not in contact; the upper end of the hand wheel positioning shaft is screwed with the pull rod seat B, the pull rod seat B is embeddedly arranged in the hand wheel, the pull rod seat B is arranged above the pull rod seat A, and the pull rod seat A is screwed with the handle; the pull rod is arranged in the hand wheel positioning shaft, the upper end of the pull rod is fixed through a nut after passing through the pull rod seat A, the lower end of the pull rod and the hand wheel positioning shaft is inserted into the toothed clutch A, the toothed clutch A is arranged below the toothed clutch B, the hand wheel positioning shaft inserted into the toothed clutch A is provided with a gap in the transverse direction and the longitudinal direction of the toothed clutch A, so that the toothed clutch A can move up and down along the hand wheel positioning shaft; the lower end of the pull rod is provided with a small hole, the toothed clutch A is provided with a horizontal hole, the lower end of the hand wheel positioning shaft is provided with a long slot hole, an internal hexagonal screw passes through the horizontal hole, the small hole and the long slot hole in sequence to fix the toothed clutch A and the pull rod on the hand wheel positioning shaft, and the toothed clutch A can be driven to move upward along the long slot hole of the hand wheel positioning shaft when the pull rod moves upward; the hand wheel positioning shaft is provided with a protruding shaft shoulder at the bearing mounting position, a spring is arranged between the shaft shoulder and the toothed clutch A, and the spring is sleeved on the hand wheel positioning shaft; The lower end surface of the pull rod seat A is provided with two convex ribs, the top end of the pull rod seat B is provided with a first convex rib groove and a second convex rib groove matched with the convex ribs, the first convex rib groove and the second convex rib groove are distributed at 90 degrees, and the height difference between the first convex rib groove and the second convex rib groove is greater than the height of toothed triangular inclined teeth of the toothed clutch A; The lower end surface of the toothed clutch A and the upper end surface of the toothed clutch B are provided with toothed triangular inclined teeth meshing with each other, the toothed triangular inclined teeth of the toothed clutch A and the toothed clutch B have the same modulus and tooth number, and the lower center of the toothed clutch B is provided with an output shaft to transmit output power. When the friction between the human body and the hand wheel is greater than the friction of the toothed triangular inclined teeth of the toothed clutch A, the toothed clutch A slides upward along the long slot hole arranged on the hand wheel positioning shaft and overcomes the spring pre-tightening force, and the clutch is automatically disengaged.

2. The stroke controller clutch handwheel mechanism for a metering pump with overload protection function according to claim 1, characterized in that The length of the long slot hole is greater than the height of the convex rib.

3. The stroke controller clutch handwheel mechanism for a metering pump with overload protection function according to claim 1, characterized in that The upper end surface of the bearing inner ring is provided with a shaft clamp, and the lower end surface of the bearing outer ring is provided with a hole clamp spring.

4. The stroke controller clutch handwheel mechanism for a metering pump with overload protection function according to claim 1, characterized in that The hand wheel support seat is provided with a bolt hole in the circumference, and the bolt hole cooperates with a bolt to use the hand wheel mechanism and external equipment in cooperation.

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