Transmission shaft structure of permanent magnet servo motor

Abstract

The utility model discloses a transmission shaft structure of a permanent magnet servo motor, which comprises a main body mechanism, the main body mechanism comprises a main shaft, an auxiliary shaft movably embedded in one end of the main shaft, a round rod fixed to the inner wall of the main shaft and stretching into an inner cavity of the auxiliary shaft, a piston fixed to the end of the round rod, a sealing piece installed at the end of the auxiliary shaft and stretching into the inner cavity of the auxiliary shaft, and a sealing rod installed on one side of the main shaft through thread engagement and stretching into the round rod. The main shaft is installed in the permanent magnet servo motor and used for outputting power, the auxiliary shaft serves as an extension portion of the main shaft and facilitates extension of the length of the main shaft, a groove is formed in one end of the main shaft, the auxiliary shaft is movably embedded in the groove, sliding grooves are formed in the inner wall of the groove in an annular array mode, protrusions are arranged on the outer side face of the auxiliary shaft in an annular array mode, and the sliding grooves are matched with the protrusions. The protrusions are embedded in the sliding grooves, so that when the main shaft rotates, the auxiliary shaft can be driven to rotate synchronously, and the transmission shaft structure of the permanent magnet servo motor has the advantages of being convenient in length adjustment and high in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet servo motors, and specifically relates to a transmission shaft structure of a permanent magnet servo motor. Background Art

[0002] The permanent magnet synchronous servo motor is a type of AC permanent magnet servo motor. In the field of medium and small capacity high-precision transmission, permanent magnet synchronous servo motors are widely used, and a permanent magnet is added to the rotor to generate a magnetic field. Due to the inherent characteristics of permanent magnet materials, it no longer requires external energy to establish a strong permanent magnetic field in the surrounding space. This can not only simplify the motor structure but also save energy.

[0003] The existing permanent magnet servo motors mainly have the following disadvantages during use: the length of the transmission shaft cannot be adjusted. In some installation environments, the distance between the transmission shaft and the equipment is relatively long, and it is necessary to connect the equipment through an extended sleeve, which is rather troublesome, time-consuming and laborious. Therefore, there is room for improvement. Summary of the Utility Model

[0004] The utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0005] For this reason, the technical solution adopted by the utility model is as follows: a transmission shaft structure of a permanent magnet servo motor, comprising: a main body mechanism, the main body mechanism includes a main shaft, a sub-shaft movably fitted at one end of the main shaft, a round rod fixed on the inner wall of the main shaft and extending into the inner cavity of the sub-shaft, a piston fixed at the end of the round rod, a closure member installed at the end of the sub-shaft and extending into the inner cavity of the sub-shaft, and a sealing rod installed on one side of the main shaft through thread engagement and extending into the round rod.

[0006] The inner part of the sub-shaft is provided with a cavity, and the cavity is filled with high-pressure gas. The piston is fitted in the cavity, and a cavity in a shape of a double-square frame that fluidly communicates with both sides of the piston is opened in the sub-shaft.

[0007] In a preferred example, the utility model can be further configured as follows: a groove is opened at one end of the main shaft, the sub-shaft is movably fitted in the groove, sliding grooves are annularly and arrayedly opened on the inner wall of the groove, and protrusions are annularly and arrayedly arranged on the outer side surface of the sub-shaft, and the protrusions are fitted in the sliding grooves.

[0008] In a preferred example, the utility model can be further configured as follows: the closure member includes a baffle plate arranged inside the cavity and closely attached to the double-square frame-shaped flow path, a support rod with one end fixed to the baffle plate and the other end extending out of the sub-shaft, a pressing plate fixed at the end of the support rod, and a spring connecting the pressing plate and the sub-shaft.

[0009] In a preferred example, the utility model can be further configured as follows: through holes are symmetrically opened on the outer side surface of the round rod, and the through holes communicate the cavity with the inner cavity of the round rod.

[0010] In a preferred embodiment, the present utility model can be further configured as follows: a threaded groove is formed at the other end of the main shaft, and the threaded groove communicates with the inner cavity of the round rod.

[0011] In a preferred embodiment, the present utility model can be further configured as follows: the sealing rod includes a bolt meshed in the threaded groove and a plug rod fixed at the end of the bolt and extending into the inner cavity of the round rod.

[0012] In a preferred embodiment, the present utility model can be further configured as follows: the diameter of the plug rod is equal to the inner diameter of the round rod.

[0013] By adopting the above technical solutions, the beneficial effects achieved by the present utility model are as follows:

[0014] 1. In the present utility model, a main shaft is provided, and a sub-shaft is movably fitted at one end of the main shaft. A cavity is formed inside the sub-shaft. At the same time, a round rod fixed on the inner wall of the main shaft and extending into the cavity of the sub-shaft is provided. A piston is fixed at the end of the round rod. In addition, a figure-eight flow channel communicating the cavities on both sides of the piston is provided inside the sub-shaft, and a sealing member extending into the cavity is provided at the end of the sub-shaft. The cavity of the sub-shaft is filled with high-pressure gas. Through the above settings, when the transmission shaft needs to be extended, only the sealing member needs to be pressed. At this time, the figure-eight flow channel is opened, the cavities on both sides of the piston are communicated, and the sub-shaft is pulled outwards to extend the length of the transmission shaft. After completion, the sealing member is released. At this time, the figure-eight flow channel is closed, and the gas in the cavities on both sides of the piston stops flowing, ensuring the stability of the sub-shaft. The length of the transmission shaft can be easily adjusted, which is convenient for the transmission shaft of the permanent magnet servo motor to be connected to the equipment at different distances, increasing the practical performance.

[0015] 2. In the present utility model, a threaded groove is formed at one end of the main shaft, and the inner cavity of the round rod is communicated with the threaded groove. At the same time, through holes are symmetrically formed on the outer side of the round rod, and a sealing rod meshed in the threaded groove and extending into the inner cavity of the round rod is provided. Through the above settings, when the high-pressure gas in the cavity of the sub-shaft needs to be replaced or supplemented, only the sealing rod needs to be turned, and high-pressure gas can be injected into the round rod through the threaded groove. After the high-pressure gas enters the round rod, it enters the cavity through the through holes, facilitating the replacement and supplementation of the high-pressure gas in the cavity of the sub-shaft and further increasing the practical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is an exploded structural diagram of the present utility model;

[0018] Figure 3 is a sectional view of the present utility model;

[0019] Figure 4This is a schematic cross-sectional structure diagram of the present utility model.

[0020] Reference numerals:

[0021] 100, main body mechanism; 110, main shaft; 111, groove; 112, chute; 113, threaded groove; 120, auxiliary shaft; 121, protrusion; 122, cavity; 123, zigzag flow; 130, round rod; 131, through hole; 140, piston; 150, sealing member; 151, baffle; 152, support rod; 153, pressing plate; 154, spring; 160, sealing rod; 161, bolt; 162, plug rod. Specific embodiments

[0022] To make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present utility model and the features in the embodiments can be combined with each other.

[0023] Some embodiments of the present utility model will be described below with reference to the accompanying drawings.

[0024] Embodiment 1:

[0025] Combined with Figures 1-4 As shown, this embodiment provides a drive shaft structure of a permanent magnet servo motor, including: a main body mechanism 100.

[0026] Among them, the main body mechanism 100 includes a main shaft 110, an auxiliary shaft 120 movably fitted at one end of the main shaft 110, a round rod 130 fixed on the inner wall of the main shaft 110 and extending into the inner cavity of the auxiliary shaft 120, a piston 140 fixed at the end of the round rod 130, a sealing member 150 installed at the end of the auxiliary shaft 120 and extending into the inner cavity of the auxiliary shaft 120, and a sealing rod 160 installed on one side of the main shaft 110 by thread engagement and extending into the round rod 130.

[0027] The main shaft 110 is installed in the permanent magnet servo motor for outputting power. The auxiliary shaft 120 serves as an extension of the main shaft 110 to facilitate extending the length of the main shaft 110. A groove 111 is opened at one end of the main shaft 110. The auxiliary shaft 120 is movably fitted in the groove 111. At the same time, chutes 112 are arranged in a circular array on the inner wall of the groove 111. Protrusions 121 are arranged in a circular array on the outer side surface of the auxiliary shaft 120. The protrusions 121 are fitted in the chutes 112, so that when the main shaft 110 rotates, the auxiliary shaft 120 can be driven to rotate synchronously.

[0028] A cavity 122 is formed inside the secondary shaft 120, and the cavity 122 is filled with high-pressure gas. One end of the round rod 130 is fixed on the inner bottom wall of the groove 111, and the other end extends into the cavity 122. The piston 140 is installed at the end of the round rod 130 extending into the cavity 122. The piston 140 is fitted in the cavity 122 and divides the cavity 122 into two independent spaces. At the same time, a figure-eight flow passage 123 is formed in the secondary shaft 120 to communicate with the cavity 122 on both sides of the piston 140. When the closure 150 is opened, as the secondary shaft 120 moves, the high-pressure gas in the cavity 122 on one side of the piston 140 enters the cavity 122 on the other side of the piston 140 through the figure-eight flow passage, facilitating the movement of the secondary shaft 120. When the closure 150 is closed, the air pressures in the cavity 122 on both sides of the piston 140 are in a static equilibrium state, thus ensuring the stability of the secondary shaft 120.

[0029] The closure 150 is used to control the opening and closing of the figure-eight flow passage, and includes a baffle 151 disposed inside the cavity 122 and closely attached to the figure-eight flow passage, a support rod 152 with one end fixed on the baffle 151 and the other end extending out of the secondary shaft 120, a pressing plate 153 fixed at the end of the support rod 152, and a spring 154 connecting the pressing plate 153 and the secondary shaft 120. The baffle 151 is used to close the figure-eight flow passage 123. The support rod 152 connects the pressing plate 153 and the baffle 151 to form an integral body, enabling the baffle 151 to move synchronously when the pressing plate 153 moves. The spring 154 ensures that the pressing plate 153 extends outwards, that is, ensures that the baffle 151 can be closely attached to the inner wall of the cavity 122 to ensure the closed state of the figure-eight flow passage.

[0030] A threaded groove 113 is formed at the other end of the main shaft 110. The threaded groove 113 communicates with the inner cavity of the round rod 130. At the same time, through holes 131 are symmetrically formed on the outer side surface of the round rod 130, and the through holes 131 communicate the cavity 122 with the inner cavity of the round rod 130, facilitating the high-pressure gas to enter the cavity 122 through the threaded groove 113, the inner cavity of the round rod 130, and the through holes 131.

[0031] The sealing rod 160 is used to seal the inner cavity of the round rod 130, and includes a bolt 161 engaged in the threaded groove 113 and a plug rod 162 fixed at the end of the bolt 161 and extending into the inner cavity of the round rod 130. The bolt 161 is used to install the plug rod 162 to ensure the stability of the plug rod 162 and facilitate the installation and disassembly of the plug rod 162. The plug rod 162 extends into the round rod 130, and the diameter of the plug rod is equal to the inner diameter of the round rod 130, which is used to seal the inner cavity of the round rod 130 and the through holes 131 to prevent the high-pressure gas in the cavity 122 from leaking.

[0032] Working principle and usage process of the utility model: During use, when it is necessary to adjust the length of the transmission shaft, press the pressure plate 153, drive the baffle 151 to move towards the inner side of the cavity 122 through the support rod 152. At this time, the figure-eight flow channel is opened, enabling the high-pressure gas in the cavities 122 on both sides of the piston 140 to flow. Pull the secondary shaft 120 outwards. As the secondary shaft 120 moves outwards, the high-pressure gas in the cavity 122 on one side of the piston 140 enters the cavity 122 on the other side of the piston 140 through the figure-eight flow channel. After the adjustment of the secondary shaft 120 is completed, release the pressure plate 153. Under the action of the spring 154, drive the pressure plate 153 to reset. The reset of the pressure plate 153 drives the baffle 151 to reset through the support rod 152, closing the figure-eight flow channel. At this time, the air pressure in the cavities 122 on both sides of the piston 140 is in a static equilibrium state, thus ensuring the stability of the secondary shaft 120.

[0033] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A transmission shaft structure of a permanent magnet servo motor, comprising: The main mechanism (100) is characterized in that the main mechanism (100) comprises a main shaft (110), a secondary shaft (120) movably engaged with one end of the main shaft (110), a round rod (130) fixed on the inner wall of the main shaft (110) and extending into the inner cavity of the secondary shaft (120), a piston (140) fixed on the end of the round rod (130), a sealing member (150) installed on the end of the secondary shaft (120) and extending into the inner cavity of the secondary shaft (120), and a sealing rod (160) installed on one side of the main shaft (110) through threaded engagement and extending into the round rod (130); The secondary shaft (120) has a cavity (122) inside, and the cavity (122) is filled with high-pressure gas. The piston (140) is embedded in the cavity (122). The secondary shaft (120) has a U-shaped flow (123) connecting the cavities (122) on both sides of the piston (140).

2. The transmission shaft structure of a permanent magnet servo motor according to claim 1, characterized in that: A groove (111) is formed at one end of the main shaft (110), and the secondary shaft (120) is movably engaged in the groove (111). A slide groove (112) is formed in an annular array on the inner wall of the groove (111), and a protrusion (121) is formed in an annular array on the outer surface of the secondary shaft (120), and the protrusion (121) is engaged in the slide groove (112).

3. The transmission shaft structure of a permanent magnet servo motor according to claim 1, characterized in that: The closing member (150) comprises a baffle (151) disposed inside the cavity (122) and close to the U-shaped flow channel, a support rod (152) with one end fixed to the baffle (151) and the other end extending out of the secondary shaft (120), a pressure plate (153) fixed to the end of the support rod (152), and a spring (154) connecting the pressure plate (153) and the secondary shaft (120).

4. The transmission shaft structure of a permanent magnet servo motor according to claim 1, characterized in that: Through holes (131) are symmetrically formed on the outer surface of the round rod (130), and the through holes (131) communicate with the cavity (122) and the inner cavity of the round rod (130).

5. The transmission shaft structure of a permanent magnet servo motor according to claim 1, characterized in that: The other end of the main shaft (110) is provided with a thread groove (113), and the thread groove (113) is communicated with the inner cavity of the round rod (130).

6. The transmission shaft structure of a permanent magnet servo motor according to claim 5, characterized in that: The sealing rod (160) comprises a bolt (161) engaged in the thread groove (113) and a blocking rod (162) fixed to the end of the bolt (161) and extending into the inner cavity of the round rod (130).

7. The transmission shaft structure of a permanent magnet servo motor according to claim 6, characterized in that: The diameter of the blocking rod (162) is equal to the inner diameter of the round rod (130).

Images