Surveying and mapping instrument with high-precision rotating device

Abstract

The utility model discloses a surveying and mapping instrument with a high-precision rotating device, which comprises a machine base, a rotating part arranged on the machine base in a manner of rotating around a rotating shaft, and a rotating device arranged between the machine base and the rotating part, and the rotating device at least comprises a worm and a helical gear set, the bevel gear set comprises a first bevel gear, a second bevel gear and an elastic piece, the bevel gear set is matched with the worm, first teeth and second teeth in the bevel gear set are meshed with threads of the worm under the pretightening force effect of the elastic piece, and a transmission gap between the bevel gear set and the worm can be well eliminated; therefore, high-precision transmission can be realized; meanwhile, the modulus of the first bevel gear and the modulus of the second bevel gear in the bevel gear set can be manufactured to be smaller than 1 and even smaller than 0.5, the machining difficulty and the machining cost are reduced, and the adjusting precision and the surveying and mapping precision of the surveying and mapping instrument are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to surveying and mapping instrument field, concretely relates to a surveying and mapping instrument with high-precision rotating device. BACKGROUND

[0002] In the precision instruments and meters, surveying and mapping instruments, precise angle measurement is needed, with the improvement of instrument automation and intelligentization requirement, in the precision angle servo system, the mechanical displacement that can realize quick rotation is usually needed to realize accurate angle adjustment.

[0003] In the existing surveying and mapping instrument, the rotation drive and brake are usually realized by the cooperation of worm gear and worm: the worm is driven by motor, the worm drives the worm gear to connect the rotating part, and the part rotation is realized; because of the self-locking principle in the worm gear transmission, when the lead angle of the worm is less than the equivalent friction angle between the meshing gear, the worm transmission has self-locking, that is, the worm can drive the worm gear transmission, and the worm gear cannot drive the worm transmission, so when the motor stops rotating, the rotating part connected with the worm gear cannot be rotated by external force. However, for small precision equipment, especially in surveying and mapping instruments or precision instruments and meters, the volume and rotation precision are generally strictly required. In order to realize the miniaturization of volume, the modulus of transmission part needs to be as small as possible under the premise of ensuring reliability, which is usually controlled below 1 or even 0.5, and if the modulus of worm gear is made small, the machining is very difficult, and the cost is also high; at the same time, the transmission gap of worm gear and worm exists, which affects the adjustment precision and surveying precision of surveying and mapping instrument, if the gap needs to be eliminated, very complex structure needs to be used, and the requirement for machining is also high. UTILITARIAN CONTENT

[0004] The utility model aims at providing a surveying and mapping instrument with high-precision rotating device to solve one or more problems of prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0006] A surveying instrument with a high-precision rotating device, the surveying instrument comprising a base, a rotating component rotatably arranged on the base about a rotation axis, and a rotating device arranged between the base and the rotating component, the rotating device comprising at least a worm and a bevel gear set, the bevel gear set comprising a first bevel gear, a second bevel gear and a resilient member, the first bevel gear and the second bevel gear being coaxially arranged on the rotation axis, wherein the first bevel gear is fixedly arranged on the rotation axis, the second bevel gear is rotatably arranged on the rotation axis, and the resilient member is arranged between the first bevel gear and the second bevel gear to provide a force required for relative rotation between the first bevel gear and the second bevel gear, wherein a first tooth is arranged on an outer circumferential portion of the first bevel gear, a second tooth is arranged on an outer circumferential portion of the second bevel gear, the first tooth and the second tooth are arranged in pairs to form a plurality of tooth pairs, and a thread of the worm is engaged with the tooth pairs of the bevel gear set.

[0007] In some embodiments, the resilient member is a spring, one end of the spring is arranged on the first bevel gear, the other end of the spring is arranged on the second bevel gear, and the connection position of the spring on the first bevel gear and the connection position of the spring on the second bevel gear are both offset from the rotation axis.

[0008] In some embodiments, a first protruding column is arranged on the first bevel gear, a second protruding column is arranged on the second bevel gear, the first protruding column and the second protruding column are both parallel to the rotation axis, the distance between the first protruding column and the rotation axis is equal to the distance between the second protruding column and the rotation axis, and one end of the spring is connected to the first protruding column and the other end of the spring is connected to the second protruding column.

[0009] In some embodiments, at least one of the first bevel gear and the second bevel gear is provided with an arc-shaped slot, and the spring is accommodated in the arc-shaped slot.

[0010] In some embodiments, when the tooth pairs are engaged with the thread of the worm, the first tooth and the second tooth in the tooth pairs are located between two adjacent threads, and the first tooth and the second tooth respectively abut against different threads.

[0011] In some embodiments, the first bevel gear and the second bevel gear have the same module, and the module of both is less than 1.

[0012] In some embodiments, the rotating device further comprises a motor and a transmission assembly, the motor comprises a motor base and a motor shaft, the motor base is fixedly arranged on the base, and the transmission assembly is arranged between the motor shaft and the worm to drive the worm to rotate about its own axis.

[0013] In some embodiments, the transmission assembly comprises a first transmission gear and a second transmission gear, the first transmission gear is coaxially fixed on the motor shaft, the second transmission gear is coaxially fixed on one end of the worm, and the first transmission gear and the second transmission gear are both spur gears and are mutually engaged.

[0014] In some embodiments, the diameter of the first transmission gear is smaller than the diameter of the second transmission gear, and the axis of the motor shaft and the axis of the worm are parallel to each other.

[0015] In some embodiments, the surveying instrument comprises two groups of the rotating components, and the rotating device is provided with two groups of rotating components which are independent of each other, wherein the two rotating shafts in the two groups of rotating components are a horizontal shaft and a vertical shaft respectively, the horizontal shaft extends in a horizontal direction, the vertical shaft extends in a vertical direction, and the horizontal shaft is arranged above the vertical shaft.

[0016] Due to the use of the above technical scheme, the surveying instrument with the high-precision rotating device has the following advantages: the high-precision rotating device comprises a bevel gear set and a worm, the first tooth and the second tooth in the bevel gear set are mutually engaged with the screw thread of the worm under the pre-tightening force of the elastic member, the transmission gap between the bevel gear set and the worm can be well eliminated, and high-precision transmission can be realized; meanwhile, the modulus of the first bevel gear and the second bevel gear in the bevel gear set can be less than 1 or even less than 0.5, the processing difficulty and the processing cost are reduced, the self-locking performance of the worm gear and the worm is retained by using the transmission device, the size and the cost control requirements and the transmission precision requirements are effectively reduced, and the adjustment precision and the surveying precision of the surveying instrument are effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiment description, obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can be obtained according to these drawings without paying creative labor.

[0018] Figure 1 It is the overall structure schematic diagram of the surveying instrument of an embodiment of the utility model;

[0019] Figure 2 It is the cooperation structure schematic diagram of a group of rotating components and rotating device in the surveying instrument; Figure 1

[0020] Figure 3 It is the structure schematic diagram of another perspective; Figure 2 ​​

[0021] Figure 4 This is a schematic diagram of the cooperation structure between the rotating device and the rotating shaft;

[0022] Figure 5 for Figure 4 A structural diagram from another perspective;

[0023] Figure 6 This is a schematic diagram of the overall structure of the rotating device;

[0024] Figure 7 This is a schematic diagram of the meshing structure between the helical gear set and the worm in the rotating device;

[0025] Figure 8 for Figure 7 Enlarged diagram of section A in the middle;

[0026] In the attached diagrams above:

[0027] 10. Base; 20. Rotating component; 201. Rotating shaft; 30. Rotating device; 1. Worm; 11. Thread; 2. Helical gear set; 21. First helical gear; 21a. First tooth; 211. First protrusion; 212. Arc groove; 22. Second helical gear; 22a. Second tooth; 221. Second protrusion; 23. Elastic element; 3. Motor; 4. First transmission gear; 5. Second transmission gear. Detailed Implementation

[0028] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is intended to aid in understanding the present invention, but does not constitute a limitation thereof.

[0029] See Figure 1 The surveying instrument shown includes a base 10, a rotating component 20 rotatably mounted on the base 10 about a rotation axis 201, and a rotation device 30 disposed between the base 10 and the rotating component 20. In this embodiment, the surveying instrument includes two sets of rotating components 20, and correspondingly, two independent sets of rotation devices 30 are provided. The two sets of rotating components 20 are distributed vertically, and the two rotation axes 201 of the two sets of rotating components 20 are a horizontal axis and a vertical axis, respectively. The center line Y of the vertical axis extends vertically, and the center line X of the horizontal axis extends horizontally, with the horizontal axis positioned above the vertical axis. Surveying is completed by adjusting the angles of the two sets of rotating components 20.

[0030] See Figures 2 to 7As shown, the rotating device 30 of the surveying instrument of the embodiment at least comprises the worm 1 and the bevel gear set 2, the bevel gear set 2 comprises the first bevel gear 21, the second bevel gear 22 and the elastic member 23, the first bevel gear 21 and the second bevel gear 22 are coaxially arranged on the rotating shaft 201, the first bevel gear 21 is fixedly arranged on the rotating shaft 201, the second bevel gear 22 is relatively rotatably arranged on the rotating shaft 201, and the elastic member 23 is arranged between the first bevel gear 21 and the second bevel gear 22 to provide the required force for the relative rotation of the two. Wherein, the outer side of the first bevel gear 21 is provided with the first tooth 21a, the outer side of the second bevel gear 22 is provided with the second tooth 22a, the first tooth 21a and the second tooth 22a are both bevel teeth, the number of the two is the same and is arranged in pairs to form a plurality of tooth pairs, and the tooth pair is composed of one first tooth 21a and one second tooth 22a. The thread 11 of the worm 1 is engaged with the above-mentioned tooth pairs of the bevel gear set 2.

[0031] Specifically, referring to Figure 6 、 Figure 7 As shown, when the tooth pairs of the bevel gear set 2 are engaged with the thread 11 of the worm 1, one tooth pair is located between the adjacent two threads 11 of the worm 1, and under the action of the pre-tightening force generated by the elastic member 23, the first bevel gear 21 and the second bevel gear 22 have a tendency to move away from each other, so that the first tooth 21a and the second tooth 22a are respectively abutted on different threads 11 when the tooth pair is between the adjacent two threads 11, that is, the first bevel gear 21 and the second bevel gear 22 are simultaneously engaged with the worm 1, thereby eliminating the gap between the bevel gear set 2 and the worm 1.

[0032] In the embodiment, the elastic member 23 is specifically a spring, one end of the spring is arranged on the first bevel gear 21, the other end of the spring is arranged on the second bevel gear 22, and the connection positions of the spring on the first bevel gear 21 and the second bevel gear 22 are both deviated from the rotating shaft 201.

[0033] Specifically, referring to Figure 7As shown, the first bevel gear 21 is provided with a first protruding column 211, and the second bevel gear 22 is provided with a second protruding column 221, the first protruding column 211 and the second protruding column 221 are both parallel to the rotating shaft 201, one end of the spring is arranged on the first protruding column 211 and the other end is arranged on the second protruding column 221. Here, the distance between the first protruding column 211 and the rotating shaft 201 is equal to the distance between the second protruding column 221 and the rotating shaft 201, so that when the spring is tensioned between the first protruding column 211 and the second protruding column 221, it can make both of them have the tendency to rotate smoothly around the rotating shaft 201. The first bevel gear 21 is also provided with an arc-shaped groove 212, and the spring is contained in the arc-shaped groove 212. Of course, the arc-shaped groove 212 can also be independently arranged on the second bevel gear 22, or part of it is arranged on the first bevel gear 21 and the other part is arranged on the second bevel gear 22, mainly used to contain the spring, so that the first bevel gear 21 and the second bevel gear 22 can be in contact with each other on the end face, thereby making them more stable when rotating relative to each other, ensuring the overall transmission accuracy of the rotating device 30.

[0034] The module of the first bevel gear 21 and the second bevel gear 22 is the same, and the module of both is less than 1. When specifically arranged, the first bevel gear 21 and the second bevel gear 22 can be two bevel gears with the same size and structure. When they are installed on the rotating shaft 201, the first bevel gear 21 is matched with the circumferential limiting structure on the rotating shaft 201, so that it cannot rotate relative to the rotating shaft 201; and the second bevel gear 22 is directly sleeved on the circular rod segment of the rotating shaft 201, so that it can rotate around the axis of the rotating shaft 201, and then an axial limiting member is added to limit the axial position of the bevel gear set 2 on the rotating shaft 201.

[0035] As shown in the drawings, the rotating device 30 also includes a motor 3 and a transmission assembly. The motor 3 includes a motor base and a motor shaft, and the motor base is fixedly arranged on the base 10. The transmission assembly is arranged between the motor shaft and the worm 1 to drive the worm 1 to rotate around its axis. Here, the transmission assembly specifically includes a first transmission gear 4 and a second transmission gear 5. The first transmission gear 4 is coaxially fixedly arranged on the motor shaft, and the second transmission gear 5 is coaxially fixedly arranged on one end of the worm 1. The first transmission gear 4 and the second transmission gear 5 are both spur gears and are meshed with each other. Among them, the diameter of the first transmission gear 4 is smaller than the diameter of the second transmission gear 5, and the axis of the motor shaft is parallel to the axis of the worm 1, realizing deceleration and high-precision transmission.

[0036] In summary, the surveying instrument with the high-precision rotating device, wherein the bevel gear set 2 and the worm 1 are matched, the first tooth 21a and the second tooth 22a in the bevel gear set 2 are meshed with the screw thread 11 of the worm 1 under the pre-tightening force of the elastic member 23, the gap between the bevel gear set 2 and the worm 1 can be well eliminated, and high-precision transmission is realized; meanwhile, the modulus of the first bevel gear 21 and the second bevel gear 22 in the bevel gear set 2 can be made less than 1 or even below 0.5, the machining difficulty and the machining cost are reduced, the self-locking performance of the worm and the gear is also reserved by using the transmission device 30, the size and the cost control requirements and the transmission precision requirements are effectively reduced, and the adjustment precision and the surveying precision of the surveying instrument are effectively improved.

[0037] The above examples are only for illustrating the technical concept and the characteristics of the utility model, the purpose is to enable the person skilled in the art to understand the content of the utility model and to implement it, and it cannot limit the protection scope of the utility model. Any equivalent change or modification according to the essence of the utility model should be covered in the protection scope of the utility model.

Claims

1. A surveying instrument having a high-precision rotation device, the surveying instrument comprising a base, a rotating member rotatably disposed on the base about a rotation axis, and a rotation device disposed between the base and the rotating member, characterized in that: The rotating device comprises at least a worm and a bevel gear set, the bevel gear set comprises a first bevel gear, a second bevel gear and a spring, the first bevel gear and the second bevel gear are coaxially arranged on the rotating shaft, wherein the first bevel gear is fixedly arranged on the rotating shaft, the second bevel gear is rotatably arranged on the rotating shaft, and the spring is arranged between the first bevel gear and the second bevel gear to provide the force required for the relative rotation of the two, wherein the outer side of the first bevel gear is provided with a first tooth, the outer side of the second bevel gear is provided with a second tooth, the number of the first tooth and the second tooth is the same and the first tooth and the second tooth are arranged in pairs to form a plurality of tooth pairs, and the thread of the worm is engaged with the tooth pairs of the bevel gear set.

2. The surveying instrument according to claim 1, characterized in that: The spring is arranged on the first bevel gear and the second bevel gear, and the connection position of the spring on the first bevel gear and the connection position of the spring on the second bevel gear are both offset from the rotating shaft.

3. The surveying instrument according to claim 2, characterized in that: The first bevel gear is provided with a first protruding column, the second bevel gear is provided with a second protruding column, the first protruding column and the second protruding column are both parallel to the rotating shaft, and the distance between the first protruding column and the rotating shaft is equal to the distance between the second protruding column and the rotating shaft, one end of the spring is connected to the first protruding column and the other end of the spring is connected to the second protruding column.

4. The surveying instrument according to claim 3, characterized in that: At least one of the first bevel gear and the second bevel gear is provided with an arc-shaped groove, and the spring is accommodated in the arc-shaped groove.

5. The surveying instrument of claim 1, wherein: When the tooth pairs and the thread of the worm are engaged, the first tooth and the second tooth in the tooth pairs are located between two adjacent threads, and the first tooth and the second tooth respectively abut on different threads.

6. The surveying instrument of claim 1, wherein: The modulus of the first bevel gear and the second bevel gear is the same, and the modulus of the two is less than 1.

7. The surveying instrument of claim 1, wherein: The rotating device further comprises a motor and a transmission assembly, the motor comprises a motor base and a motor shaft, the motor base is fixedly arranged on the base, and the transmission assembly is arranged between the motor shaft and the worm to drive the worm to rotate around its axis.

8. The surveying instrument according to claim 7, characterized in that: The transmission assembly comprises a first transmission gear and a second transmission gear, the first transmission gear is coaxially fixedly arranged on the motor shaft, and the second transmission gear is coaxially fixedly arranged on one end of the worm, the first transmission gear and the second transmission gear are both spur gears and are engaged with each other.

9. The surveying instrument according to claim 8, characterized in that: The diameter of the first transmission gear is smaller than the diameter of the second transmission gear, and the axis of the motor shaft is parallel to the axis of the worm.

10. The surveying instrument according to any one of claims 1 to 9, characterized in that: The surveying instrument comprises two groups of the rotating components, and correspondingly, the rotating device comprises two groups of rotating components which are independent of each other, wherein the two rotating shafts in the two groups of rotating components are a horizontal shaft and a vertical shaft respectively, the horizontal shaft extends in the horizontal direction, the vertical shaft extends in the vertical direction, and the horizontal shaft is arranged above the vertical shaft.

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