Electric horizontal pan-tilt for monitoring and method for adjusting side clearance of worm and worm gear

Abstract

The present invention relates to an electric horizontal pan-tilt for monitoring and a method for adjusting the side clearance of a worm and a worm wheel, which can not only increase the load-bearing capacity of the pan-tilt by 2 to 3 times, but also adjust the side clearance of the worm and the worm wheel to within 1 wire, and at the same time reduce the part cost by more than 30%. In theory, when the center of the worm shaft is assembled with the center of the worm wheel in the horizontal worm wheel shaft, they are aligned. However, in practice, the meshing side clearance of the worm shaft and the horizontal worm wheel shaft during manufacturing is 5 to 10 wires, and adjustment is required during assembly. When the horizontal worm wheel shaft and the worm shaft are assembled, since the horizontal angular contact ball bearing contacts the horizontal adjusting nut, by adjusting the position of the horizontal adjusting nut by screwing in or out, the position of the worm wheel in the horizontal worm wheel shaft can be adjusted. When the horizontal angular contact ball bearing is screwed in, the horizontal angular contact ball bearing will move upward, causing the worm wheel in the overall horizontal worm wheel shaft to move upward. In this way, the side clearance between the worm wheel in the horizontal worm wheel shaft and the worm in the worm shaft is reduced, achieving a side clearance meshing accuracy adjustment of less than 1 wire. Conversely, the situation is reversed.

Description

Technical Field

[0001] The present invention relates to an electric horizontal pan-tilt for monitoring and a method for adjusting the side clearance of a worm and a worm gear, which can not only increase the load-bearing capacity of the pan-tilt by 2 to 3 times, but also adjust the side clearance of the worm and the worm gear to within 1 wire, and at the same time reduce the part cost by more than 30%, belonging to the field of manufacturing pan-tilts for monitoring. Background Art

[0002] Existing electric pan-tilts generally operate in two directions: horizontal and vertical. The maximum load capacity of the pan-tilt generally refers to the maximum load capacity that can be borne in the vertical direction. At present, most of them on the market are driven by copper worm and worm gear to achieve a larger load capacity. However, after long-term operation, the copper worm is easy to wear. To increase the load, it is necessary to increase the module of the worm and worm gear, which will cause the size and weight of the entire pan-tilt to increase. Moreover, the actual operating environment of the pan-tilt is variable, and the basic backlash accuracy cannot be adjusted after leaving the factory. Summary of the Invention

[0003] Design Objective: To avoid the deficiencies in the background art, design an electric horizontal pan-tilt for monitoring and a method for adjusting the side clearance of a worm and a worm gear, which can not only increase the load-bearing capacity of the pan-tilt by 2 to 3 times, but also adjust the side clearance of the worm and the worm gear to within 1 wire, and at the same time reduce the part cost by more than 30%.

[0004] Design Scheme: To achieve the above design objective. In the structural design of the present invention: 1. The worm and the worm gear adopt an integral high-strength wear-resistant steel worm gear. The overall hardness of the wear-resistant steel worm gear will be about HRC30. After surface nitriding treatment, its surface hardness can reach more than HV550, and the hardened layer depth > 0.2mm. The purpose is to effectively improve the load-bearing capacity of the pan-tilt, that is, the load-bearing capacity of the overall pan-tilt can be increased by 2 to 3 times. At the same time, the manufacturing cost is reduced by more than 30%, and the defects of poor wear resistance and large wear amount of the copper worm and worm gear are solved, effectively preventing wear and improving the service life of the worm and worm gear. 2. After the new horizontal worm gear shaft and the horizontal main shaft are assembled and formed, the adjustable clearance structure of the present invention can drive the new horizontal worm gear shaft to retreat or advance by screwing the horizontal bearing locking nut with the new horizontal worm gear shaft, and then drive the new horizontal worm gear shaft to retreat or advance, so that the side clearance between the worm gear teeth and the worm teeth on the new horizontal worm gear shaft becomes smaller or larger, and the side clearance of the worm and the worm gear can be adjusted according to actual needs, and the minimum can be adjusted to within 1 wire, fundamentally meeting the requirements of the backlash accuracy of the pan-tilt indexing.

[0005] Technical solution 1: An electric horizontal pan-tilt for monitoring. On one side of the worm gear in the horizontal worm shaft is a screw-adjusting shaft. After screwing on the horizontal adjusting nut, sleeving on the horizontal angular contact ball bearing and the elastic washer, it is located in the horizontal worm and worm gear seat, and the bolt hole at the shaft end of the screw-adjusting shaft is connected to the base connecting plate by a bolt. One end of the worm shaft is inside the worm shaft hole through the first angular contact ball bearing, and the other end of the worm shaft is inside the worm shaft hole through the second angular contact ball bearing and is locked with a lock nut. The pin column is placed inside the worm gear, and the horizontal driving gear is locked with screws. The accompanying gear is stacked on the horizontal driving gear, and a torsion spring is placed between the horizontal driving gear and the accompanying gear. One end of the torsion spring is stuck in the hole of the horizontal driving gear, and the other end of the torsion spring is stuck in the hole of the horizontal magnetic deviation accompanying gear, so that the teeth of the accompanying gear and the teeth of the horizontal driving gear form an elastic dislocation and the accompanying gear is driven to rotate by the horizontal driving gear. The snap ring is stuck on the shaft to limit the horizontal driving gear; Two deep groove ball bearings are installed in the horizontal worm and worm gear seat. The horizontal driven gear is installed on the box body and meshes with the horizontal driving gear and elastically meshes with the accompanying gear. The horizontal driven gear shaft is sleeved with a shaft sleeve through a bearing, and a groove is formed between the shaft sleeve and the shaft end face. The magnet block is located in the groove, and the horizontal magnetic deviation accompanying ring is sleeved on the shaft sleeve.

[0006] Technical solution 2: A method for adjusting the clearance between the worm and the worm gear of an electric horizontal pan-tilt for monitoring. In theory, the center of the worm shaft and the center of the worm gear in the horizontal worm shaft are aligned during assembly. However, in practice, the meshing backlash of the worm shaft and the horizontal worm shaft during manufacturing is 5-10 silk, and adjustment is required during assembly. The accompanying gear is stacked on the horizontal driving gear, and a torsion spring is placed between the horizontal driving gear and the accompanying gear. One end of the torsion spring is stuck in the hole of the horizontal driving gear, and the other end of the torsion spring is stuck in the hole of the horizontal magnetic deviation accompanying gear. The teeth of the accompanying gear and the teeth of the horizontal driving gear are elastically misaligned by one tooth forward or backward under the action of the torsion spring, and the misaligned teeth of the accompanying gear are in close meshing fit with the horizontal driven gear; When the horizontal worm shaft and the worm shaft are assembled and formed, due to the contact between the horizontal angular contact ball bearing and the horizontal adjusting nut, by adjusting the screwing-in or screwing-out position of the horizontal adjusting nut, the position of the worm gear in the horizontal worm shaft can be adjusted. When the horizontal angular contact ball bearing is screwed in, the horizontal angular contact ball bearing will move upward, causing the worm gear in the overall horizontal worm shaft to move upward. In this way, the side clearance between the worm gear in the horizontal worm shaft and the worm in the worm shaft is reduced, and the side clearance meshing accuracy is adjusted to be less than 1 silk. Conversely, it is the opposite.

[0007] Compared with the background technology, the present invention has the following advantages: First, the manufacturing cost of the worm and worm gear is reduced by more than 30%, the bearing capacity is increased by 2-3 times, and the service life is increased from 1.5 million rotations in the background technology to more than 2.5 million rotations; Second, it realizes that the manufacturing error is compensated by the assembly method, and the side clearance accuracy of the worm and worm gear after adjustment and compensation reaches within 1 silk. Description of the Drawings

[0008] Figure 1 It is an exploded structural schematic diagram of an electric horizontal pan-tilt for monitoring.

[0009] Figure 2 It is a schematic cross-sectional view of an electric horizontal pan-tilt for monitoring.

[0010] Figure 3 It is Figure 1 A schematic diagram of the assembled finished product.

[0011] Figure 4 It is a front view schematic diagram of the follower gear.

[0012] Figure 5 It is Figure 4 A schematic side sectional view.

[0013] Figure 6 It is Figure 4 A three-dimensional schematic diagram. Specific implementation mode

[0014] Example 1: Refer to the appendix Figures 1-6 . An electric horizontal pan-tilt for monitoring, on one side of the worm gear in the horizontal worm shaft 13 is a screw adjustment shaft. A horizontal adjusting nut 26 is screwed onto the screw adjustment shaft. After sleeving a horizontal angular contact ball bearing 7 and an elastic washer 8, it is located inside the horizontal worm gear housing 9, and the bolt hole at the shaft end of the screw adjustment shaft is connected to the base connection plate 14 by a bolt 22. One end of the worm shaft 10 is inside the worm shaft hole through a first angular contact ball bearing 1, and the other end of the worm shaft 10 is located inside the worm shaft hole through a second angular contact ball bearing 2 and is locked with a lock nut. The pin column 3 is placed into the worm gear. The horizontal driving gear 15 is locked with a screw 24. The follower gear 16 is stacked on the horizontal driving gear 15, and a torsion spring 19 is placed between the horizontal driving gear 15 and the follower gear 16. One end of the torsion spring 19 is stuck in the hole of the horizontal driving gear, and the other end of the torsion spring 19 is stuck in the hole of the horizontal magnetic deviation follower gear 16, so that the teeth of the follower gear 16 and the teeth of the horizontal driving gear 15 form an elastic misalignment and the follower gear 16 is driven to rotate by the horizontal driving gear 15. A snap ring 6 is stuck on the shaft to limit the horizontal driving gear 15; two deep groove ball bearings 20 are installed in the horizontal worm gear housing 9. The horizontal driven gear 17 is installed on the box body and meshes with the horizontal driving gear 15 and elastically meshes with the follower gear 16. A bushing is sleeved on the horizontal driven gear shaft through a bearing 5 (a bearing 5 is sleeved on the horizontal driven gear shaft, and a bushing is sleeved on the bearing 5), and a groove is formed between the bushing and the shaft end face. The magnet block 4 is located in the groove. The horizontal magnetic deviation follower ring 12 is sleeved on the bushing.

[0015] The teeth of the follower gear 16 and the teeth of the horizontal driving gear 15 are elastically misaligned by one tooth forward or backward under the action of the torsion spring 19, and both the follower gear 16 and the horizontal driving gear 15 mesh with the horizontal driven gear 17. A groove is opened on the surface of the follower gear 16 opposite to the horizontal driving gear 15, and this groove is used to install the torsion spring 19.

[0016] The horizontal adjusting nut 26 screwed onto the horizontal worm shaft 13 can be screwed in or out slightly to adjust the meshing accuracy between the worm wheel in the horizontal worm shaft 13 and the worm shaft 11.

[0017] The horizontal adjusting nut 26 is provided with a threaded hole, and a locking bolt is screwed into the threaded hole.

[0018] On one side of the worm wheel in the horizontal worm shaft 13 is a shaft, and on the other side of the worm wheel is a locking and adjusting shaft. The end face of the locking and adjusting shaft is provided with a countersunk head bolt connection hole corresponding to the end face of the base connection disc 14.

[0019] Embodiment 2: On the basis of Embodiment 1, a method for adjusting the clearance between the worm and the worm wheel of an electric horizontal pan-tilt for monitoring is characterized in that: theoretically, the center of the worm shaft 11 is aligned with the center of the worm wheel in the horizontal worm shaft 13 during assembly, but in fact, the meshing backlash between the worm shaft 11 and the horizontal worm shaft 13 during manufacturing is 5-10 filaments, and adjustment is required during assembly. The accompanying gear 16 is superimposed on the horizontal driving gear 15, and a torsion spring 19 is arranged between the horizontal driving gear 15 and the accompanying gear 16. One end of the torsion spring 19 is stuck in the hole of the horizontal driving gear, and the other end of the torsion spring 19 is stuck in the hole of the horizontal magnetic declination accompanying gear 16. The teeth of the accompanying gear 16 and the teeth of the horizontal driving gear 15 are elastically misaligned by one tooth forward or backward under the action of the torsion spring 19. The misaligned teeth of the accompanying gear 16 are in close meshing fit with the horizontal driven gear 17, aiming to eliminate the meshing clearance between the horizontal driving gear and the driven gear 17 and improve the meshing accuracy; when the horizontal worm shaft 13 and the worm shaft 11 are assembled, since the horizontal angular contact ball bearing 7 contacts the horizontal adjusting nut 26, by adjusting the screwing-in or screwing-out position of the horizontal adjusting nut 26, the position of the worm wheel in the horizontal worm shaft 13 can be adjusted. When the horizontal angular contact ball bearing 7 is screwed in, the horizontal angular contact ball bearing 7 will move upward, causing the worm wheel in the overall horizontal worm shaft 13 to move upward. In this way, the side clearance between the worm wheel in the horizontal worm shaft 13 and the worm in the worm shaft 11 is reduced, and the side clearance meshing accuracy is adjusted to be less than 1 filament. Conversely, it is the opposite.

[0020] It should be understood that: Although the above embodiments have made detailed written descriptions of the design concept of the present invention, these written descriptions are only simple written descriptions of the design concept of the present invention, rather than limitations on the design concept of the present invention. Any combination, addition or modification that does not exceed the design concept of the present invention falls within the protection scope of the present invention.

Claims

1. An adjustment method for the clearance between the worm and the worm gear of an electric horizontal pan-tilt for monitoring, characterized in that: On one side of the worm wheel in the horizontal worm wheel shaft (13) is a threaded adjustment shaft. After screwing on the horizontal adjustment nut (26), sleeving on the horizontal angular contact ball bearing (7) and the elastic washer (8), it is located inside the horizontal worm wheel and worm seat (9). The bolt hole at the shaft end of the threaded adjustment shaft is connected to the base connection plate (14) by a bolt (22). One end of the worm shaft (10) is inside the worm shaft hole through the first angular contact ball bearing (1). The other end of the worm shaft (10) is located inside the worm shaft hole through the second angular contact ball bearing (2) and is locked with a lock nut. The pin column (3) is placed inside the worm wheel. The horizontal driving gear (15) is locked with screws (24). The accompanying gear (16) is stacked on the horizontal driving gear (15), and a torsion spring (19) is placed between the horizontal driving gear (15) and the accompanying gear (16). One end of the torsion spring (19) is stuck in the hole of the horizontal driving gear, and the other end of the torsion spring (19) is stuck in the hole of the horizontal magnetic declination accompanying gear (16), so that the teeth of the accompanying gear (16) and the teeth of the horizontal driving gear (15) form an elastic misalignment, and the accompanying gear (16) is driven to rotate by the horizontal driving gear (15). The snap ring (6) is stuck on the shaft to limit the horizontal driving gear (15). Two deep groove ball bearings (20) are installed in the horizontal worm wheel and worm seat (9). The horizontal driven gear (17) is installed on the box body and meshes with the horizontal driving gear (15) and elastically meshes with the accompanying gear (16). A shaft sleeve is sleeved on the horizontal driven gear shaft through a bearing (5), and a groove is formed between the shaft sleeve and the shaft end face. The magnet block (4) is located in the groove. The horizontal magnetic declination accompanying ring (12) is sleeved on the shaft sleeve. When the horizontal worm wheel shaft (13) and the worm shaft (11) are assembled, due to the contact between the horizontal angular contact ball bearing (7) and the horizontal adjustment nut (26), by adjusting the screwing-in or screwing-out position of the horizontal adjustment nut (26), the position of the worm wheel in the horizontal worm wheel shaft (13) can be adjusted. When the horizontal angular contact ball bearing (7) is screwed in, the horizontal angular contact ball bearing (7) will move upward, making the worm wheel in the overall horizontal worm wheel shaft (13) move upward. In this way, the side clearance between the worm wheel in the horizontal worm wheel shaft (13) and the worm in the worm shaft (11) is reduced, and the side clearance meshing accuracy can be adjusted to be less than 1 silk. Conversely, it is the opposite.

2. The method for adjusting the clearance between the worm and the worm gear of the electric horizontal pan-tilt for monitoring according to claim 1, wherein: The teeth of the accompanying gear (16) and the teeth of the horizontal driving gear (15) are elastically misaligned by one tooth forward or backward under the action of the torsion spring (19), and both the accompanying gear (16) and the horizontal driving gear (15) mesh with the horizontal driven gear (17).

3. The method for adjusting the clearance between the worm and the worm gear of the electric horizontal pan-tilt for monitoring according to claim 1, characterized in that: The horizontal adjustment nut (26) screwed on the horizontal worm wheel shaft (13) can be slightly screwed in or out to adjust the meshing accuracy between the worm wheel in the horizontal worm wheel shaft (13) and the worm shaft (11).

4. The method for adjusting the clearance between the worm and the worm gear of the electric horizontal pan-tilt for monitoring according to claim 1, wherein: The horizontal adjustment nut (26) is provided with a threaded hole, and a locking bolt is screwed in the threaded hole.

5. The method for adjusting the clearance between the worm and the worm gear of the electric horizontal pan-tilt for monitoring according to claim 1, characterized in that: On one side of the worm wheel in the horizontal worm wheel shaft (13) is a shaft, and on the other side of the worm wheel is a locking adjustment shaft. The end face of the locking adjustment shaft is provided with a countersunk bolt connection hole corresponding to the end face of the base connection plate (14).

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