Four-bar linkage flip cap assembly

Abstract

The utility model discloses four connecting rod turnover cover subassembly relates to theodolite protection device technical field, including the hatch cover of being closed in the cabin body top and the installation box of being fixed in the cabin body rear side, both sides of hatch cover are fixed with fixed plate, two fixed plates all are fixed with two connecting rod axle, one of connecting rod axle is rotatably provided with first turnover arm, and the other connecting rod axle is rotatably provided with second turnover arm, and first turnover arm and second turnover arm staggered setting are set in front and back, first turnover arm is inserted and fixed with first rotating shaft in the one end away from connecting rod axle, the utility model discloses the setting of two pairs of first turnover arm and second turnover arm can avoid theodolite collision when the hatch cover turns over when opening, and need not set another group drive mechanism to control the self turnover angle of hatch cover, can also improve the support stability to hatch cover through four connecting rod structure, reduce the bearing capacity of single turnover arm, thereby slow down the abrasion when turning over, prolong the service life to a certain extent.

Description

Technical Field

[0001] This utility model relates to the technical field of theodolite protective devices, and in particular to a four-bar flip cover assembly. Background Technology

[0002] As is well known, a theodolite is an instrument used in surveying to measure horizontal and vertical angles. It can indicate and display the corresponding measurement results. Theodolites are precision surveying instruments. Usually, when the theodolite is not in use or is being transported, it needs to be placed in a dedicated cabin to ensure its safety. In the existing technology, the theodolite is mostly placed in a cabin with an open top and a cover is installed. When the theodolite is in use, the cover needs to be opened to expose the theodolite's measuring device in the theodolite cabin and avoid interference from the theodolite cabin to the theodolite's measurements.

[0003] A search revealed a patent document with publication number "CN212779184U" disclosing a rear-flipping hatch structure for a theodolite cabin. This structure includes a cabin body and a protective cover, as well as flipping arms, a drive shaft, and a cornering mechanism. The top and rear end of the cabin body features a protective cover with an open bottom. Multiple supports are spaced along the width of the cabin body on the rear end face. The drive shaft is rotatably connected to the supports. Depending on the requirements, the drive shaft can be rotatably connected to the supports via bearings, effectively reducing friction between the drive shaft and the supports and ensuring the stability of the drive shaft's rotation. A motor for driving the drive shaft is located at the rear end of the cabin body. Two flipping arms are fastened to one end of each drive shaft. The flipping arms have a bent structure, with the bent tips facing the rear end of the cabin body. The other ends of the two flipping arms are hinged to the sides of the protective cover. This invention effectively solves the problem of the large size and inconvenient operation of existing theodolite cabin hatches.

[0004] Based on the above search and combined with existing technology, it was found that the existing flip structure consists of a double-arm structure (two flip arms, one on each arm) and a corner mechanism to control the flip angle of the hatch. This makes the control of the flip structure more complex and requires real-time operation (to control the angle of the hatch itself). At the same time, the double-arm structure has a large load-bearing capacity and is prone to vibration when rotating, which accelerates wear and reduces service life. Therefore, a four-link flip hatch assembly is needed. Utility Model Content

[0005] The purpose of this application is to provide a four-link flip cover assembly to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a four-link flip-top assembly, including a hatch cover that covers the top of the cabin and an installation box fixed to the rear side of the cabin. Fixing plates are fixed on both the front and rear sides of the hatch cover, and two connecting rod shafts are fixed on each of the two fixing plates.

[0007] A first flip arm is rotatably sleeved on one of the connecting rod shafts, and a second flip arm is rotatably sleeved on the other connecting rod shaft. The first flip arm and the second flip arm are arranged alternately.

[0008] The first rotating arm is fixedly connected to the first rotating shaft at the end away from the connecting rod shaft. The first rotating shaft is rotatably mounted on the mounting box and passes through the front and rear sides of the mounting box.

[0009] The second rotating arm is fixedly connected to a second rotating shaft at the end away from the connecting rod shaft. The second rotating shaft is also rotatably mounted on the mounting box and passes through the front and rear sides of the mounting box.

[0010] The mounting box contains a servo motor and a reducer. The output shaft of the servo motor is connected to the input end of the reducer, and the output end of the reducer causes the first shaft to rotate.

[0011] Furthermore, a transmission mechanism is installed between the first rotating shaft and the second rotating shaft. The first rotating shaft drives the second rotating shaft to rotate asynchronously through the transmission mechanism. The transmission ratio between the first rotating shaft and the second rotating shaft is 1:0.94 to 1:0.98.

[0012] Furthermore, the transmission mechanism includes a driven gear, a driving gear, and a transmission gear. The driven gear is fixedly mounted on the second rotating shaft, the driving gear is fixedly mounted on the first rotating shaft, and the transmission gear is rotatably connected to the mounting box through the rotating shaft. The driving gear drives the driven gear to rotate through the transmission gear, and the diameter of the driving gear is smaller than the diameter of the driven gear.

[0013] Furthermore, the two connecting rod shafts located on the same fixed plate are obliquely distributed, and the two connecting rod shafts are staggered on one side of the fixed plate, alternating left and right and up and down.

[0014] Furthermore, the second rotating shaft is also obliquely distributed like the first rotating shaft, and the second rotating shaft and the first rotating shaft are also staggered left and right and up and down. The distance between the second rotating shaft and the first rotating shaft is the same as the distance between the fixed plate and the connecting rod shaft, but the tilt angle formed between the fixed plate and the connecting rod shaft is different from the tilt angle formed between the second rotating shaft and the first rotating shaft.

[0015] Furthermore, the connection points between the first tilting arm and the first rotating shaft, as well as the connection points between the first tilting arm and the fixed plate, are located to the left of the connection points between the second tilting arm and the second rotating shaft, and the connection points between the second tilting arm and the connecting rod shaft.

[0016] Furthermore, a filling cavity is provided in the lower part of the hatch, and the bottom of the filling cavity is a semi-circular groove;

[0017] The filling cavity is filled with a viscous damping fluid. When the viscous damping fluid is calm, there is a gap between the top of the liquid surface and the filling cavity. The height of the gap is less than one-tenth of the height of the viscous damping fluid cross-section.

[0018] In summary, the technical effects and advantages of this utility model are as follows:

[0019] 1. In this utility model, by setting two pairs of first and second flip arms, after the servo motor starts, it drives the first rotating shaft to rotate through the reducer. When the first rotating shaft rotates, it drives the hatch cover to flip through the first flip arms. At the same time, the second flip arms form an auxiliary support and limit function, and rotate with the hatch cover. Thus, the hatch cover always maintains a horizontal posture under the joint support of the first and second flip arms, and opens in a horizontal posture. This can also prevent the hatch cover from flipping and colliding with the theodolite when it is opened. Moreover, there is no need to set another set of drive mechanisms to control the self-flipping angle of the hatch cover. The four-bar linkage structure can also improve the support stability of the hatch cover, reduce the load on a single flip arm, thereby slowing down the wear during flipping and extending the service life to a certain extent.

[0020] 2. In this utility model, the first rotating shaft drives the driving gear to rotate when it rotates, and drives the driven gear to rotate through the transmission gear. This causes the second rotating shaft to generate a differential transmission in the same direction as the first rotating shaft, so that the first tilting arm and the second tilting arm cooperate with each other to ensure that the hatch maintains a balanced state during the opening and closing process, thereby achieving the purpose of controlling the attitude of the hatch. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure in this embodiment;

[0023] Figure 2 This is a schematic diagram of the component structure inside the mounting box in this embodiment;

[0024] Figure 3 This is a schematic diagram of the opening and flipping motion in this embodiment;

[0025] Figure 4 This is a schematic diagram of the side section structure of the hatch in this embodiment.

[0026] In the diagram: 1. Hatch cover; 11. Fixing plate; 12. Connecting rod shaft; 13. Filling cavity; 14. Viscous damping fluid; 2. First tilting arm; 3. Second tilting arm; 4. Second rotating shaft; 41. Driven gear; 5. First rotating shaft; 51. Drive gear; 6. Mounting box; 7. Servo motor; 8. Reducer; 9. Transmission gear. Detailed Implementation

[0027] 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.

[0028] Example 1: Reference Figures 1-3 The four-bar flip cover assembly shown includes a cover 1 that covers the top of the cabin and a mounting box 6 that is fixed to the rear side of the cabin. The front and rear sides of the cover 1 are fixed with fixing plates 11, and two connecting rod shafts 12 are fixed on the two fixing plates 11.

[0029] One of the connecting rod shafts 12 is rotatably fitted with a first flipping arm 2, and the other connecting rod shaft 12 is rotatably fitted with a second flipping arm 3. The first flipping arm 2 and the second flipping arm 3 are arranged alternately.

[0030] The first rotating arm 2 is connected to a first rotating shaft 5 at one end away from the connecting rod shaft 12. The first rotating shaft 5 is rotatably mounted on the mounting box 6 and passes through the front and rear sides of the mounting box 6.

[0031] The second rotating arm 3 is connected to a second rotating shaft 4 at one end away from the connecting rod shaft 12. The second rotating shaft 4 is also rotatably mounted on the mounting box 6 and passes through the front and rear sides of the mounting box 6.

[0032] The mounting box 6 contains a servo motor 7 and a reducer 8. The output shaft of the servo motor 7 is connected to the input end of the reducer 8, and the output end of the reducer 8 drives the first rotating shaft 5 to rotate.

[0033] Based on the above structure, after the servo motor 7 starts, it drives the first rotating shaft 5 to rotate through the reducer 8. When the first rotating shaft 5 rotates, it drives the hatch 1 to rotate through the first tilting arm 2. At the same time, the second tilting arm 3 provides auxiliary support and limit function, and rotates with the hatch 1 as it rotates. This ensures that the hatch 1 always maintains a horizontal posture under the joint support of the first tilting arm 2 and the second tilting arm 3, and opens in a horizontal posture. This also avoids the hatch 1 from flipping and colliding with the theodolite when it is opened. Furthermore, there is no need to set up another set of drive mechanisms (the corner mechanism in the prior art) to control the self-tilting angle of the hatch 1. The four-bar linkage structure (two pairs of first tilting arms 2 and second tilting arms 3) can also improve the support stability of the hatch 1, reduce the load on a single tilting arm, thereby slowing down the wear during tilting and extending the service life to a certain extent.

[0034] Furthermore, a transmission mechanism is installed between the first rotating shaft 5 and the second rotating shaft 4. The first rotating shaft 5 drives the second rotating shaft 4 to rotate asynchronously through the transmission mechanism. The transmission ratio between the first rotating shaft 5 and the second rotating shaft 4 is 1:0.94 to 1:0.98 (that is, when the first rotating shaft 5 rotates one revolution, the second rotating shaft 4 rotates 0.94 to 0.98 revolutions, so that the first tilting arm 2 and the second tilting arm 3 can cooperate with each other to keep the hatch 1 balanced during the opening and closing process).

[0035] The transmission mechanism includes a driven gear 41, a driving gear 51, and a transmission gear 9. The driven gear 41 is fixedly sleeved on the second rotating shaft 4, the driving gear 51 is fixedly sleeved on the first rotating shaft 5, and the transmission gear 9 is rotatably connected to the mounting box 6 through the rotating shaft. The driving gear 51 drives the driven gear 41 to rotate through the transmission gear 9. The diameter of the driving gear 51 is smaller than the diameter of the driven gear 41.

[0036] When the first rotating shaft 5 rotates, it drives the driving gear 51 to rotate, and drives the driven gear 41 to rotate through the transmission gear 9. This causes the second rotating shaft 4 to generate a differential transmission in the same direction as the first rotating shaft 5, so that the first tilting arm 2 and the second tilting arm 3 cooperate with each other to ensure that the hatch 1 always maintains a balanced state during the opening and closing process, thereby achieving the purpose of controlling the attitude of the hatch 1.

[0037] Furthermore, to ensure better coordination between the first tilting arm 2 and the second tilting arm 3, and to prevent them from interfering with each other during rotation, two connecting rod shafts 12 located on the same fixed plate 11 are obliquely distributed, with the two connecting rod shafts 12 staggered left and right, and up and down on one side of the fixed plate 11 (see reference). Figure 1 or Figure 3 The positional relationship in the text is not an absolute positional relationship and should not be used as a limitation on this embodiment (the same applies below).

[0038] The second rotating shaft 4 and the first rotating shaft 5 are also obliquely distributed, and the second rotating shaft 4 and the first rotating shaft 5 are also staggered in the left and right and up and down. The distance between the second rotating shaft 4 and the first rotating shaft 5 is the same as the distance between the fixed plate 11 and the connecting rod shaft 12, but the tilt angle formed between the fixed plate 11 and the connecting rod shaft 12 is different from the tilt angle formed between the second rotating shaft 4 and the first rotating shaft 5.

[0039] The connection points of the first tilting arm 2 and the first rotating shaft 5, as well as the connection points of the first tilting arm 2 and the fixed plate 11, are located to the left of the connection points of the second tilting arm 3 and the second rotating shaft 4, and the connection points of the second tilting arm 3 and the connecting rod shaft 12. Example 2

[0040] like Figure 4 As shown, this embodiment is based on embodiment 1, and the difference between it and embodiment 1 is that:

[0041] A filling cavity 13 is provided in the lower part of the hatch 1, and the bottom of the filling cavity 13 is a semi-circular groove.

[0042] The filling cavity 13 is filled with a viscous damping fluid 14 (viscous damping fluid is existing technology and will not be described in detail here). When the viscous damping fluid 14 is calm, there is a gap between the top of the liquid surface and the filling cavity 13, and the height of the gap is less than one-tenth of the cross-sectional height of the viscous damping fluid 14.

[0043] By opening a filling cavity 13 in the lower part of the hatch 1 and filling the filling cavity 13 with viscous damping fluid 14, when the hatch 1 vibrates during the opening process, the vibration force is transmitted inward and absorbed by the viscous damping fluid 14, converted into the kinetic energy of the viscous damping fluid 14 and eventually consumed. This can enhance the stability of the hatch 1 during the opening process, thereby producing a better balanced flipping action in conjunction with the first flipping arm 2, the second flipping arm 3 and the transmission mechanism in Embodiment 1, and further improving the attitude stability of the hatch 1 when opening and closing.

[0044] The working principle of this utility model is as follows: During daily use, after the servo motor 7 starts, it drives the first rotating shaft 5 to rotate through the reducer 8. When the first rotating shaft 5 rotates, it drives the hatch 1 to rotate through the first tilting arm 2. At the same time, when the first rotating shaft 5 rotates, it drives the drive gear 51 to rotate, and drives the driven gear 41 to rotate through the transmission gear 9. This causes the second rotating shaft 4 to generate a differential transmission in the same direction as the first rotating shaft 5, so that the first tilting arm 2 and the second tilting arm 3 cooperate with each other. The second tilting arm 3 forms an auxiliary support and limit function, and rotates with the hatch 1 as it rotates. Thus, the hatch 1 always maintains a horizontal posture under the joint support of the first tilting arm 2 and the second tilting arm 3, and opens in a horizontal posture. This also avoids the hatch 1 from flipping and colliding with the theodolite when it is opened. There is no need to set up another set of drive mechanisms to control the self-tilting angle of the hatch 1. The four-bar linkage structure can also improve the support stability of the hatch 1, reduce the load on a single tilting arm, thereby reducing wear during tilting and extending the service life to a certain extent.

[0045] It should be further noted that the technical features of servo motors, reducers, viscous damping fluids, etc. involved in this utility model patent application should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be adopted using conventional choices in the field, and should not be regarded as the inventive point of this utility model patent. This utility model patent will not be further elaborated in detail.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present 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 the present utility model should be included within the protection scope of the present utility model.

Claims

1. A four-link flip-top assembly, comprising a hatch cover (1) that closes onto the top of the cabin and a mounting box (6) fixed to the rear side of the cabin, characterized in that: The hatch (1) is fixed with fixing plates (11) on both the front and rear sides, and two connecting rod shafts (12) are fixed on each of the two fixing plates (11). A first flip arm (2) is rotatably sleeved on one of the connecting rod shafts (12), and a second flip arm (3) is rotatably sleeved on the other connecting rod shaft (12). The first flip arm (2) and the second flip arm (3) are arranged alternately. The first rotating arm (2) is connected to a first rotating shaft (5) at one end away from the connecting rod shaft (12). The first rotating shaft (5) is rotatably mounted on the mounting box (6) and passes through the front and rear sides of the mounting box (6). The second rotating arm (3) is connected to a second rotating shaft (4) at one end away from the connecting rod shaft (12). The second rotating shaft (4) is also rotatably mounted on the mounting box (6) and passes through the front and rear sides of the mounting box (6). The mounting box (6) is fixed with a servo motor (7) and a reducer (8). The output shaft of the servo motor (7) is connected to the input end of the reducer (8). The output end of the reducer (8) drives the first rotating shaft (5) to rotate. A transmission mechanism is installed between the first rotating shaft (5) and the second rotating shaft (4). The first rotating shaft (5) drives the second rotating shaft (4) to rotate asynchronously through the transmission mechanism. The transmission ratio between the first rotating shaft (5) and the second rotating shaft (4) is 1:0.94 to 1:0.

98.

2. The four-link flip-top cover assembly according to claim 1, characterized in that: The transmission mechanism includes a driven gear (41), a driving gear (51), and a transmission gear (9). The driven gear (41) is fixedly mounted on the second rotating shaft (4), the driving gear (51) is fixedly mounted on the first rotating shaft (5), and the transmission gear (9) is rotatably connected to the mounting box (6) through the rotating shaft. The driving gear (51) drives the driven gear (41) to rotate through the transmission gear (9). The diameter of the driving gear (51) is smaller than the diameter of the driven gear (41).

3. The four-link flip-top cover assembly according to claim 2, characterized in that: Two connecting rod shafts (12) located on the same fixed plate (11) are obliquely distributed, and the two connecting rod shafts (12) are staggered on one side of the fixed plate (11) in the left and right and up and down.

4. The four-link flip-top cover assembly according to claim 3, characterized in that: The second rotating shaft (4) and the first rotating shaft (5) are also obliquely distributed, and the second rotating shaft (4) and the first rotating shaft (5) are also staggered left and right and up and down. The distance between the second rotating shaft (4) and the first rotating shaft (5) is the same as the distance between the fixed plate (11) and the connecting rod shaft (12), but the tilt angle formed between the fixed plate (11) and the connecting rod shaft (12) is different from the tilt angle formed between the second rotating shaft (4) and the first rotating shaft (5).

5. The four-link flip-top cover assembly according to claim 1, characterized in that: The connection between the first flipping arm (2) and the first rotating shaft (5) and the connection between the first flipping arm (2) and the fixed plate (11) are both located to the left of the connection between the second flipping arm (3) and the second rotating shaft (4) and the connection between the second flipping arm (3) and the connecting rod shaft (12).

6. The four-link flip-top cover assembly according to any one of claims 1-5, characterized in that: The lower part of the hatch (1) is provided with a filling cavity (13), and the bottom of the filling cavity (13) is a semi-circular groove; The filling cavity (13) is filled with a viscous damping fluid (14). When the viscous damping fluid (14) is calm, there is a gap between the top of the liquid surface and the filling cavity (13). The height of the gap is less than one-tenth of the cross-sectional height of the viscous damping fluid (14).

Images