Transmission assembly, rotary base and laser demarcation device

Abstract

The utility model discloses a transmission assembly and a rotary base, and belongs to the technical field of laser demarcation devices, the transmission assembly comprises a first transmission chain, the first transmission chain comprises a planetary gear train, a helical gear and a gear cover, the helical gear and a sun gear of the planetary gear train are coaxially arranged, and the gear cover is installed on the planetary gear train; the second transmission chain is meshed with the outer teeth of the gear cover; and the third transmission chain is meshed with the outer teeth of the helical gear. The rotating base comprises a transmission assembly, a box body and a top cover, the top cover is installed on the box body, and the transmission assembly is arranged in the box body. According to the transmission assembly provided by the utility model, the first transmission chain, the second transmission chain and the third transmission chain are matched, so that the transmission of a rotation angle can be completed. The first transmission chain comprises a plurality of planetary gears, the gear chain back clearance of the planetary gears tends to the chain with the minimum back clearance, and therefore the gear chain precision is improved in a self-adaptive mode.

Description

Technical Field

[0001] The utility model relates to the field of laser line projectors, and in particular to a transmission component, a rotating base and a laser line projector. Background Art

[0002] A laser line meter is a type of measuring instrument that installs a laser device on a level. During use, the laser line meter emits a laser beam, which passes through a prism light guide system to form a laser surface to project horizontal and plumb laser lines, ultimately achieving the purpose of measurement. However, traditional laser line meters still have the following shortcomings.

[0003] The rotating bases of traditional laser tools often use single- or multi-stage gears for transmission. This results in low transmission precision, unstable transmission, and significant backlash in both forward and reverse directions. Furthermore, multi-stage gears require complex assembly processes and machining of transmission parts, resulting in high costs, bulk, high energy consumption, low efficiency, and high noise levels. Overall, existing transmission structures struggle to meet the market's demand for high precision. Utility Model Content

[0004] In order to overcome the problems of poor transmission accuracy of transmission components in the prior art, the utility model aims to provide a transmission component and a rotating base.

[0005] In order to achieve the above-mentioned purpose, the technical solution of this utility model is:

[0006] First, the utility model provides a transmission assembly, including

[0007] a first transmission chain comprising a planetary gear train, a helical gear and a gear cover, wherein the helical gear is coaxially arranged with a sun gear of the planetary gear train, and the gear cover is mounted on the planetary gear train;

[0008] a second transmission chain meshing with the outer teeth of the gear cover;

[0009] The third transmission chain is engaged with the outer teeth of the helical gear.

[0010] In one embodiment, the planetary gear train further includes a ring gear and a plurality of planetary gears, the sun gear is located at the center of the ring gear, and the planetary gears are connected between the sun gear and the ring gear.

[0011] In one embodiment, the ring gear is installed between the gear cover and the helical gear, and the planetary gears are engaged with the gear cover.

[0012] In one embodiment, the gear height of the planetary gear is equal to the sum of the inner tooth height of the ring gear and the inner tooth height of the gear cover.

[0013] In one embodiment, a step is provided at the connection between the sun gear and the helical gear, and the ring gear is sleeved on the step.

[0014] In one embodiment, the second transmission chain includes an arc-shaped gear and a fixing seat, wherein the fixing seat is mounted on the top of the arc-shaped gear, and the arc-shaped gear is meshed with the outer teeth of the gear ring.

[0015] In one embodiment, the central angle of the arc gear is 30°.

[0016] In one embodiment, the second transmission chain includes an arc-shaped gear and a fixing seat, wherein the fixing seat is mounted on the top of the arc-shaped gear, and the arc-shaped gear is meshed with the outer teeth of the gear cover.

[0017] Secondly, the present invention also provides a rotating base, comprising the transmission assembly, box body and top cover described in any one of the above items, wherein the top cover is mounted on the box body, and the transmission assembly is inside the box body.

[0018] In one embodiment, an arc-shaped groove is formed on the top cover, and a fixing seat in the transmission assembly is inserted into the arc-shaped groove.

[0019] Finally, the utility model also provides a laser line projector, which is installed on any of the rotating bases described above.

[0020] The transmission assembly provided by the present invention can achieve rotational angle transmission through the cooperation of the first, second, and third transmission chains. The first transmission chain includes multiple planetary gears, and the gear chain backlash tends to favor the chain with the smallest backlash, thereby adaptively improving gear chain precision. Furthermore, because the present invention comprises three independent transmission chain systems, the smaller individual dimensions are easier to maintain and achieve during the injection molding process.

[0021] In order to make the above features and advantages of the utility model more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the transmission component in the present utility model.

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the first transmission chain in the present utility model.

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the planetary gear system in the present utility model.

[0025] Figure 4 It is a cross-sectional schematic diagram of the planetary gear system in the present utility model.

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the helical gear in the utility model.

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the rotating base in the utility model.

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure inside the rotating base box of the utility model.

[0029] Figure 8 This is a schematic diagram of the three-dimensional structure of the laser line projector in the present invention installed on the rotating base.

[0030] Reference numerals:

[0031] 1-transmission assembly; 11-first transmission chain; 12-second transmission chain; 13-third transmission chain; 111-planetary gear train; 112-bevel gear; 113-gear cover; 114-rotating shaft; 1111-sun gear; 1112-planetary gear; 1113-ring gear; 1114-first hole; 1121-step; 121-arc gear; 122-fixed seat; 131-driving member; 132-worm; 2-rotating base; 21-housing; 22-top cover; 221-arc slot; 3-laser projection instrument. DETAILED DESCRIPTION

[0032] To make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1 As shown, the present invention first provides a transmission assembly 1, comprising a first transmission chain 11, a second transmission chain 12 and a third transmission chain 13, wherein the second transmission chain 12 and the third transmission chain 13 are respectively engaged with the first transmission chain 11 for transmission.

[0034] like Figure 2As shown, the first transmission chain 11 is a planetary gear differential transmission chain, including a planetary gear train 111 and a helical gear 112. The planetary gear train 111 and the helical gear 112 are coaxially arranged above and below, and the second transmission chain 12 is meshed with the planetary gear train 111, and the third transmission chain 13 is meshed with the helical gear 12. A gear cover 113 is provided on the planetary gear train 111. The first transmission chain 11 also includes a rotating shaft 114, which is sequentially arranged through the center of the gear cover 113, the planetary gear train 111, and the helical gear 112, allowing the planetary gear train 111 and the helical gear 112 to rotate coaxially, while simultaneously driving the second transmission chain 12 and the third transmission chain 13 to rotate.

[0035] Please combine Figure 3 and Figure 4 The planetary gear train 111 includes a sun gear 1111, several planetary gears 1112, and a ring gear 1113. The sun gear 1111 is located at the center of the ring gear 1113. Several planetary gears 1112 are connected between the sun gear 1111, the ring gear 1113, and the gear cover 113, respectively meshing with the sun gear 1111, the ring gear 1113, and the gear cover 113. The gear height of the planetary gears 1112 is equal to the sum of the internal tooth heights of the ring gear 1113 and the gear cover 113. A first hole 1114 is located at the center of the sun gear 1111, and the rotating shaft 114 passes through the first hole 1114. The sun gear 1111 rotates about the rotating shaft 114, and the rotation is transmitted to the gear cover 113 through the planetary gears 1112, thereby driving the second transmission structure 12 meshing with the external teeth of the gear cover 113.

[0036] Please combine Figure 5 The helical gear 112 is an external gear. In this embodiment, the sun gear 1111 and the helical gear 112 are integrally formed. A step 1121 is provided at the connection between the helical gear 112 and the sun gear 1111, and the ring gear 1113 is sleeved on the step 1121. In this embodiment, the sun gear 1111 and the helical gear 112 rotate about the rotating shaft 114, and the gear cover 113 is driven to rotate synchronously via the planetary gears 1112.

[0037] Combine Figure 1, the second transmission chain 12 is a parallel gear transmission chain, including an arc gear 121 and a fixed seat 122. The fixed seat 122 is installed on the top of the arc gear 121 and is used to install external equipment such as a laser line projector. The arc gear 121 is arc-shaped, and the size of its corresponding central angle is related to the angle that needs to be rotated. In this embodiment, the central angle of the arc gear 121 is 30°. The arc gear 121 is engaged with the external teeth of the gear cover 113, and the rotation of the planetary gear system 111 is transmitted to the arc gear 121 through the gear cover 113, thereby driving the fixed seat 122 and the external equipment such as the laser line projector installed on the fixed seat 122 to rotate the corresponding angle.

[0038] The third transmission chain 13 is a worm helical gear transmission chain, comprising a drive member 131 and a worm 132. The worm 132 is horizontally arranged, and the drive member 131 is mounted on the head of the worm 132 to drive the worm 132 to rotate horizontally. The worm 132 has an external thread structure and engages with the helical gear 112 via the external thread. Driven by the drive member 131, the horizontal rotation of the worm 132 is transmitted to the helical gear 112. The helical gear 112 converts the horizontal rotation into vertical rotation and transmits this rotation to the coaxially arranged planetary gear train 111. The vertical rotation is then transmitted via the planetary gear train 111 to an external device such as a laser line projector fixedly mounted on the second transmission chain 12. Of course, in some other embodiments, the third transmission chain 12 can also be manually adjusted by adjusting the worm 132 via a manual adjustment knob connected to the worm 132.

[0039] Please combine Figure 6 and Figure 7 The present invention further provides a rotating base 2, which can be used to install instruments and equipment requiring a rotating function, such as a laser line projector. The rotating base 2 includes a housing 21 and a top cover 22. The top cover 22 is mounted on the housing 21, and the transmission assembly 1 is mounted inside the housing 21. In this embodiment, an arcuate groove 221 is formed on the top cover 22, and the fixed seat 122 of the second transmission chain 12 is inserted into the arcuate groove 221. The arc length of the arcuate groove 221 is greater than the arc length of the fixed seat 122, so that the fixed seat 122 can rotate in the arcuate groove 221.

[0040] When in use, the driving member 131 drives the worm 132 to rotate according to the required rotation angle, and the bevel gear engaged with the worm 132 converts the horizontal rotation of the worm 132 into vertical rotation, and transmits the rotation to the gear cover 113 through the sun gear 1111 and the planetary gears 1112. At the same time, the gear cover 113 drives the arc gear 121 engaged with it and the fixing seat 122 to rotate the corresponding angle.

[0041] like Figure 8 As shown, the rotating base 2 provided by the present invention is used as an example of a laser line projector 3. In this embodiment, the laser line projector 3 is connected to the rotating base 2 via a fixed base 122 to achieve rotation. Of course, the form of the laser line projector 3 provided in this embodiment is only one of them. According to actual needs, the laser line projector 3 can be other forms of laser line projectors or other devices that require rotation.

[0042] In summary, the transmission assembly 1 provided by the present invention can achieve rotational angle transmission through the cooperation of the first transmission chain 11, the second transmission chain 12, and the third transmission chain 13. The first transmission chain 11 includes multiple planetary gears 1112, and the gear chain backlash tends to favor the chain with the smallest backlash, thereby adaptively improving gear chain precision. Furthermore, because the present invention comprises three independent transmission chain systems, the smaller individual dimensions are easier to maintain and achieve during the injection molding process.

[0043] Although the present invention has been disclosed above with reference to the embodiments, they are not intended to limit the present invention. Anyone with ordinary skill in the art may make slight modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the appended patent applications.

Claims

1. Transmission assembly, characterized in that, include a first transmission chain comprising a planetary gear train, a helical gear and a gear cover, wherein the helical gear is coaxially arranged with a sun gear of the planetary gear train, and the gear cover is mounted on the planetary gear train; a second transmission chain meshing with the outer teeth of the gear cover; The third transmission chain is engaged with the outer teeth of the helical gear.

2. The transmission assembly according to claim 1, characterized in that: The planetary gear train further includes a ring gear and a plurality of planetary gears. The sun gear is located at the center of the ring gear, and the planetary gears are connected between the sun gear and the ring gear.

3. The transmission assembly according to claim 2, characterized in that: The ring gear is installed between the gear cover and the helical gear, and the planetary gear is engaged with the gear cover.

4. The transmission assembly according to claim 3, characterized in that: The gear height of the planetary gear is equal to the sum of the inner tooth height of the ring gear and the inner tooth height of the gear cover.

5. The transmission assembly according to claim 4, characterized in that: A step is provided at the connection between the sun gear and the helical gear, and the gear ring is sleeved on the step.

6. The transmission assembly according to claim 1, characterized in that: The second transmission chain includes an arc-shaped gear and a fixing seat, wherein the fixing seat is mounted on the top of the arc-shaped gear, and the arc-shaped gear is meshed with the outer teeth of the gear cover.

7. The transmission assembly according to claim 1, characterized in that: The third transmission chain includes a driving member and a worm, wherein the driving member is mounted on the head of the worm, and the worm is engaged with the external teeth of the helical gear.

8. Rotating base, characterized in that, The invention comprises the transmission assembly, a box body and a top cover according to any one of claims 1 to 7, wherein the top cover is mounted on the box body, and the transmission assembly is housed in the box body.

9. The rotating base according to claim 8, characterized in that: An arc-shaped groove is provided on the top cover, and a fixing seat in the transmission assembly is passed through the arc-shaped groove.

10. Laser line projector, characterized in that: Installed on the rotating base according to any one of claims 8-9.

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