High-precision elevator

Abstract

The application provides a high-precision elevator, comprising: two opposite arranged lifting towers; a linear guide unit respectively installed on the two lifting towers; a sliding frame unit arranged between the two lifting towers; a rolling bed unit installed on the sliding frame unit; a speed reduction motor unit for driving the sliding frame unit to lift; a reinforcing unit for reinforcing the lifting tower; the speed reduction motor unit drives a transmission mechanism in the lifting tower, drives the sliding frame unit and the rolling bed unit to vertically lift along the linear guide unit; the beneficial effects of the application are: the rigid transmission mechanism composed of a cylindrical camshaft and a roller replaces the belt friction transmission of the prior art, completely solves the positioning error problem caused by belt slip and elastic elongation, and the horizontal groove design at both ends of the spiral groove makes the roller in the conveying position in a self-locking state, and the repeated positioning accuracy can reach ±0.1mm.

Description

Technical Field

[0001] This invention relates to the field of teaching hoist technology, and in particular to a high-precision hoist. Background Technology

[0002] As a mature automated assembly industry, automobile manufacturing relies heavily on conveying equipment. From small connections between workstations to large connections between production lines, various forms of conveying equipment are involved. Between production lines and even between workshops, the transport of vehicle bodies often involves the interaction of ground and overhead conveyor lines. Hoists are the key conveying equipment connecting the ground and the air, using horizontal and vertical movement to transfer the vehicle body and its carrier between the ground and space.

[0003] The structure of lifting machines varies, but the most commonly used in the automotive industry is the two-post belt lift. Its main structure includes a column unit, a drive unit, a carriage unit, a roller bed unit, and a counterweight unit. The two columns serve as both support structures and guide rails. The roller bed unit is fixed to the carriage unit for horizontal transport of the vehicle body; guide wheel mechanisms are arranged at the four corners, forming a vertical linear motion pair with the column guide rails. The drive unit includes a geared motor, rollers, and a belt, mounted on the top of the column; the two ends of the belt are connected to the carriage and the counterweight unit respectively. The counterweight unit balances the load on the carriage. Utilizing the wrap angle between the belt and the rollers, the motor drives the rollers through friction transmission, and the belt connects to the carriage for vertical up-and-down movement.

[0004] Two-column belt lifts use belt friction drive and are supplemented by rubber-coated wheel guides, which determines their insufficient transmission accuracy and poor stability. Their positional accuracy is as low as ±5 mm. Summary of the Invention

[0005] To overcome the aforementioned problems in the prior art, the present invention provides a high-precision lifting machine.

[0006] This invention discloses a high-precision hoist, comprising: two lifting towers arranged opposite to each other; linear guide units respectively installed on the two lifting towers; a carriage unit disposed between the two lifting towers; a roller bed unit installed on the carriage unit; a reduction motor unit for driving the carriage unit to move up and down; and a reinforcement unit for reinforcing the lifting towers. The reduction motor unit drives a transmission mechanism inside the lifting towers, causing the carriage unit and the roller bed unit to move vertically up and down along the linear guide units.

[0007] Based on this, the lifting tower includes a cylindrical camshaft, bearings, bearing housings, a commutator, a housing, and a base plate. The housing serves as a load-bearing structure. The cylindrical camshaft is vertically installed inside the housing. The bearings are installed at both ends of the cylindrical camshaft and support its rotation. The bearing housings are fixed to the top of the housing and cooperate with the upper bearing. The commutator is fixed to the bottom of the housing. The base plate is fixed to the bottom of the housing for installation on the ground. The journal of the cylindrical camshaft cooperates with the inner ring of the bearing. The lower end of the cylindrical camshaft is connected to the output hole of the commutator.

[0008] Based on this, the cylindrical camshaft has a spiral groove around its shaft. The starting and ending sections of the spiral groove are concave contour lines with a gradually changing pressure angle, and the middle section is a concave contour line with a constant pressure angle.

[0009] Based on this, the geared motor unit includes a geared motor and a ten-way universal coupling. The geared motor has dual output shafts. The geared motor is fixed between the two lifting towers by a motor mounting plate. The two output shafts of the geared motor are respectively connected to the horizontal input shafts of the commutators of the two lifting towers through the ten-way universal coupling.

[0010] Based on this, the linear guide unit includes a cylindrical guide rail, which is vertically installed between the guide rail fixing seat and the guide rail connecting seat. The guide rail fixing seat is fixed to the base plate, and the guide rail connecting seat is fixed to the top of the lifting tower.

[0011] Based on this, the carriage unit includes a carriage, roller shafts, rollers, sliding seats, and sliding bearings. The carriage is located between the two lifting towers. The roller shafts are installed at both ends of the carriage through roller connecting seats. The rollers are fixed to the ends of the roller shafts and cooperate with the helical grooves of the cylindrical camshaft. The sliding seats are installed at the four corners of the carriage. The sliding bearings are installed in each of the sliding seats and slide in cooperation with the cylindrical guide rail.

[0012] Based on this, one end of the reinforcement unit is connected to the lifting tower, and the other end is fixedly connected to the ground, forming a triangular stable structure.

[0013] Based on this, the cylindrical camshafts of the two lifting towers are arranged symmetrically from left to right, and the spiral grooves of the two are mirror-symmetrical, so that when the geared motor drives, the two cylindrical camshafts rotate synchronously, driving the carriage unit to rise or fall simultaneously.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] (1) The present invention replaces the belt friction transmission of the prior art with a rigid transmission mechanism composed of a cylindrical camshaft and rollers, which completely solves the positioning error problem caused by belt slippage and elastic elongation. At the same time, the horizontal groove design at both ends of the spiral groove makes the rollers in the conveying position in a self-locking state, and the repeatability positioning accuracy can reach ±0.1 mm, which is about 50 times higher than the ±5 mm of the prior art.

[0016] (2) In this invention, the spiral groove of the cylindrical camshaft is provided with a gradually changing pressure angle profile at both ends. The roller is subjected to a gradually increasing or decreasing thrust when starting and stopping, so as to achieve smooth acceleration and deceleration, avoid the impact and vibration caused by sudden speed changes, and effectively protect the vehicle body from impact deformation.

[0017] (3) In this invention, four sliding bearings are set at the four corners of the carriage to cooperate with the cylindrical guide rail, forming a precise linear motion pair. The carriage and load fall in the middle of the four guide support points, so the force is uniform and there is no problem of uneven load. At the same time, the counterweight unit is eliminated, the load on the column is halved, and the deformation is greatly reduced. Combined with the triangular stable structure formed by the reinforcement unit, the shaking amplitude of the whole machine is significantly reduced. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the hoist of the present invention;

[0019] Figure 2 This is a schematic diagram of the transmission mechanism of the hoist of the present invention;

[0020] Figure 3 This is a schematic diagram of the working position of the hoist of the present invention;

[0021] In the diagram: 1. Lifting tower, 2. Linear guide unit, 3. Carriage unit, 4. Roller bed unit, 5. Gear motor unit, 6. Reinforcement unit, 101. Cylindrical camshaft, 102. Bearing, 103. Bearing housing, 104. Reversing device, 105. Housing, 106. Foot plate, 201. Guide rail fixing seat, 202. Cylindrical guide rail, 203. Guide rail connecting seat, 301. Carriage, 302. Roller connecting seat, 303. Roller shaft, 304. Roller, 305. Sliding seat, 306. Sliding bearing, 501. Gear motor, 502. Motor mounting plate, 503. Universal coupling. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0023] like Figure 1 and Figure 2As shown, this invention discloses a high-precision hoist, which includes: two opposing lifting towers 1, two sets of linear guide units 2 respectively installed on the two lifting towers 1, a carriage unit 3 disposed between the two lifting towers 1, a roller bed unit 4 installed on the carriage unit 3, a reduction motor unit 5 for driving the carriage unit 3 to lift and lower, and a reinforcement unit 6 for reinforcing the lifting towers 1; the reduction motor unit 5 drives the transmission mechanism inside the lifting tower 1, driving the carriage unit 3 and the roller bed unit 4 to move vertically up and down along the linear guide unit 2, thereby realizing the handover and conversion of the vehicle body between the ground conveyor line and the aerial conveyor line; the entire hoist has a compact structure, good transmission rigidity, high positioning accuracy, and stable operation;

[0024] like Figure 2 As shown, the lifting tower 1 includes a cylindrical camshaft 101, a bearing 102, a bearing housing 103, a commutator 104, a housing 105, and a base plate 106. The housing 105 serves as the load-bearing structure and is the main frame of the entire lifting tower 1. It is made of high-strength steel plate and welded together, possessing sufficient rigidity and strength. The housing 105 has an internal vertical cavity for mounting the cylindrical camshaft 101, and the side of the housing 105 has a mounting plane for connecting the linear guide unit 2. The cylindrical camshaft 101 is vertically mounted inside the housing 105, serving as the core transmission element. The cylindrical camshaft 101 is made of alloy steel and its surface is hardened, giving it high hardness and wear resistance. The shaft of the cylindrical camshaft 101 has a surrounding spiral groove. The helical groove is used to cooperate with the roller 304 to convert the rotational motion of the cylindrical camshaft 101 into the linear motion of the roller 304. The bearing 102 is installed at both ends of the cylindrical camshaft 101 and supports its rotation. The upper and lower ends of the cylindrical camshaft 101 are respectively provided with journals. The upper journal cooperates with the inner ring of one bearing 102, and the lower journal cooperates with the inner ring of another bearing 102. The outer ring of the lower bearing 102 cooperates with the mounting seat welded inside the housing 105, and the outer ring of the upper bearing 102 cooperates with the bearing seat 103. With the support of the upper and lower sets of bearings 102, the cylindrical camshaft 101 can rotate smoothly and freely around its own axis inside the housing 105, and the radial runout and axial movement are controlled within a very small range.

[0025] The bearing housing 103 is fixed to the top of the housing 105 and mates with the upper bearing 102; the bearing housing 103 is detachably fixed to the top end face of the housing 105 by bolts, and has mounting holes inside that mate with the outer ring of the bearing 102; the upper end of the bearing housing 103 is provided with a sealing cover to prevent dust and impurities from entering the bearing 102; the upper end of the cylindrical camshaft 101 is reliably fixed to the top of the housing 105 through the bearing housing 103; the commutator 104 is fixed to the bottom of the housing 105; the commutator 104 has a pair of meshing bevel gears inside, one of which... One bevel gear is fixedly connected to the horizontal input shaft, and the other bevel gear is fixedly connected to the vertical output hole; the horizontal input shaft of the commutator 104 extends outside the housing 105 to receive external power; the vertical output hole is connected to the lower end of the cylindrical camshaft 101; when the horizontal input shaft rotates, the horizontal rotational motion is converted into vertical rotational motion through the bevel gear pair, thereby driving the cylindrical camshaft 101 to rotate; the housing of the commutator 104 is fixed to the bottom of the housing 105 by bolts, and its interior is filled with grease to ensure the lubrication and life of the bevel gear pair; foot The base plate 106 is fixed to the bottom of the housing 105 to secure the entire lifting tower 1 to the ground. The base plate 106 is a thick steel plate welded to the bottom of the housing 105, with multiple anchor bolt holes. During installation, the base plate 106 is fixed to the pre-embedded steel plate on the workshop floor using anchor bolts, and leveling can be achieved by adjusting shims. The two lifting towers 1 are arranged opposite each other, with the horizontal input shafts of the commutators 104 located on the same axis to ensure that the geared motor unit 5 can drive both commutators 104 simultaneously. The journal of the cylindrical camshaft 101 and... The inner ring of bearing 102 fits, allowing cylindrical camshaft 101 to rotate freely around its own axis under the support of bearing 102. The lower end of cylindrical camshaft 101 is connected to the output hole of commutator 104. The lower end of cylindrical camshaft 101 is provided with an external spline or a flat key, and the output hole of commutator 104 is provided with a corresponding internal spline or keyway. The two are connected by splines or flat keys to achieve torque transmission. When the horizontal input shaft of commutator 104 rotates, the horizontal rotation is converted into vertical rotation through the bevel gear pair inside commutator 104, thereby driving cylindrical camshaft 101 to rotate.

[0026] like Figure 2As shown, the cylindrical camshaft 101 has a spiral groove around its shaft. The starting and ending sections of the spiral groove have concave contours with gradually changing pressure angles, while the middle section has a concave contour with a constant pressure angle. Specifically, the spiral groove is divided into three sections from top to bottom: an upper gradually changing section, a middle constant pressure section, and a lower gradually changing section. The upper gradually changing section is located at the beginning of the spiral groove, i.e., the air transport position, where its pressure angle gradually increases from 0 degrees to a constant value. The pressure angle of the middle constant pressure section remains constant, for example, at 45 degrees. The lower gradually changing section is located at the end of the spiral groove, i.e., the ground transport position, where its pressure angle gradually decreases from a constant value to 0 degrees. The gradually changing pressure angles at both ends of the groove allow the driven rollers to smoothly accelerate and decelerate during startup and shutdown, avoiding impacts and vibrations caused by sudden speed changes, thereby protecting the vehicle. The roller is protected from impact deformation; the constant pressure angle in the middle section ensures that the roller moves at a uniform speed during the middle stroke, achieving smooth lifting and lowering; at the same time, the two ends of the spiral groove are set as horizontal grooves, and when the roller 304 moves to the horizontal groove position, it corresponds to the ground conveying position and the air conveying position; since the position of the horizontal groove is fixed, and there is a precise linear correspondence between the rotation angle of the cylindrical camshaft 101 and the linear displacement of the roller 304, the repeatability of the two conveying positions is extremely high, reaching ±0.1 mm; in addition, since the pressure angle in the middle section is constant, the displacement of the roller 304 is proportional to the rotation angle of the cylindrical camshaft 101. With the precise control of the servo motor, the roller can also be accurately stopped at any position in the middle, meeting the conveying needs of different height positions;

[0027] like Figure 1 and Figure 2 As shown, the geared motor unit 5 includes a geared motor 501 and a universal coupling 503. The geared motor 501 is a geared motor with dual output shafts, meaning that both ends of the motor output shaft extend out of the gearbox housing, forming two coaxial and synchronously rotating output shafts. The geared motor 501 integrates a reduction mechanism, which can reduce the high-speed rotation of the motor to a suitable operating speed as needed and output a larger torque. The geared motor 501 is preferably a servo motor to achieve precise speed and position control. The motor mounting plate 502 is used to fix the geared motor 501 between the two lifting towers 1. The motor mounting plate 502 is a rectangular steel plate. The plate has its two ends fixedly connected to the sides of the housing 105 of the two lifting towers 1, and its middle part is provided with a mounting seat for mounting the geared motor 501. The geared motor 501 is fixed to the motor mounting plate 502 by bolts, and its two output shafts face the lifting towers 1 on both sides respectively. The two output shafts of the geared motor 501 are respectively connected to the horizontal input shaft of the commutator 104 of the two lifting towers 1 through a universal joint 503. The universal joint 503 consists of two universal joints and an intermediate shaft. One end of the universal joint 503 is fixedly connected to the output shaft of the geared motor 501 by a key, and the other end is fixedly connected to the horizontal input shaft of the commutator 104 by a key.

[0028] During operation, the geared motor 501 starts, and its two output shafts rotate simultaneously and in the same direction. The power is transmitted to the commutators 104 on both sides through the universal joint 503. The universal joint 503 can compensate for the coaxiality error and angular deviation between the output shaft of the geared motor 501 and the input shaft of the commutator 104, ensuring smooth transmission and avoiding additional loads caused by installation errors. After the power is reversed by the commutator 104, it drives the two cylindrical camshafts 101 to rotate synchronously. Since the two cylindrical camshafts 101 are arranged symmetrically from left to right, and the direction of their helical grooves is mirror symmetrical, when the cylindrical camshafts 101 rotate, the two rollers 304 move up or down along the grooves at the same time, thereby driving the carriage unit 3 to rise and fall smoothly.

[0029] like Figure 1 and Figure 2 As shown, the linear guide unit 2 includes a cylindrical guide rail 202, a guide rail fixing seat 201, and a guide rail connecting seat 203. The cylindrical guide rail 202 is made of high-precision cold-drawn linear optical shaft, and its surface is chrome-plated, giving it high hardness, wear resistance, and corrosion resistance. The outer diameter tolerance of the cylindrical guide rail 202 is controlled at level h6, and the surface roughness reaches Ra0.4 or less to ensure precise fit and low-friction movement with the sliding bearing 306. The guide rail fixing seat 201 serves as the lower end support of the cylindrical guide rail 202 and is fixed to the base plate 106. The guide rail fixing seat 201 is L-shaped or T-shaped, and its bottom surface is fixedly connected to the base plate 106 by bolts. Its side is provided with mounting holes that mate with the lower end of the cylindrical guide rail 202. The lower end of the cylindrical guide rail 202 is inserted into the mounting hole of the guide rail fixing seat 201 and secured by set screws. Alternatively, a locking nut can be used for fixation; the guide rail connecting seat 203 serves as the upper support for the cylindrical guide rail 202 and is fixed to the top of the lifting tower 1; the guide rail connecting seat 203 is inverted L-shaped, one end of which is fixedly connected to the top side of the housing 105 of the lifting tower 1 by bolts, and the other end is provided with an installation hole that mates with the upper end of the cylindrical guide rail 202; the upper end of the cylindrical guide rail 202 is inserted into the installation hole of the guide rail connecting seat 203 and fixed by a set screw or a locking nut; through the cooperation of the guide rail fixing seat 201 and the guide rail connecting seat 203, the cylindrical guide rail 202 is vertically and firmly fixed to the side of the lifting tower 1, forming a precise vertical guide rail; four cylindrical guide rails 202 are respectively installed on the front and rear sides of the two lifting towers 1, with two rails installed on each lifting tower 1, located at the front and rear ends of the housing 105 respectively, together forming four guide fulcrums.

[0030] like Figure 2As shown, the carriage unit 3 includes a carriage 301, roller shafts 303, rollers 304, sliding seats 305, and sliding bearings 306. The carriage 301 is located between the two lifting towers 1 and serves as the main structure supporting the roller bed unit 4. The carriage 301 is constructed from welded steel sections into a rectangular frame structure, possessing high rigidity and strength. A mounting seat for mounting the roller bed unit 4 is provided in the middle area of ​​the carriage 301. Connecting plates for mounting roller connecting seats 302 are provided at both ends of the carriage 301. Mounting planes for mounting sliding seats 305 are provided at the four corners of the carriage 301. Roller connecting seats 302 are mounted at both ends of the carriage 301. A roller connecting seat 302 is fixed at each of the left and right ends of the carriage 301. 02 is fixed to the end connecting plate of the carriage 301 by bolts; the roller connecting seat 302 is provided with a bearing hole for mounting the roller shaft 303; the roller shaft 303 is mounted on the roller connecting seat 302; one end of the roller shaft 303 is mounted in the bearing hole of the roller connecting seat 302 by a bearing or bushing, and can rotate freely around its own axis; the other end of the roller shaft 303 extends out of the roller connecting seat 302 for mounting the roller 304. The roller 304 is fixed to the end of the roller shaft 303 and mates with the helical groove of the cylindrical camshaft 101; the roller 304 adopts a rolling bearing structure, its outer ring forms rolling contact with the helical groove of the cylindrical camshaft 101, and its inner ring is fixedly connected to the roller shaft 303. When the cylindrical camshaft 101 rotates... During operation, the sidewalls of the spiral groove push the outer ring of the roller 304, causing the roller 304 to move along the groove. Simultaneously, the roller 304 rolls, converting sliding friction into rolling friction, significantly reducing frictional resistance and wear. The outer ring of the roller 304 is made of hardened bearing steel, possessing extremely high hardness and wear resistance, capable of withstanding significant contact stress. Sliding seats 305 are installed at the four corners of the carriage 301. Each sliding seat 305 is a casting or machined part, with one end fixed to the corner of the carriage 301 by bolts, and the other end having mounting holes for installing sliding bearings 306. Sliding bearings 306 are installed within each sliding seat 305 and slide in cooperation with the cylindrical guide rail 202. The sliding bearings 306 are preferably made of self-lubricating graphite copper bushings or... The engineering plastic bearing has an inner hole that forms a clearance fit with the outer circle of the cylindrical guide rail 202. The clearance is controlled within the range of 0.01-0.05mm. The sliding bearing 306 has self-lubricating properties and does not require additional lubrication, making maintenance convenient. When the carriage 301 is raised or lowered, the four sliding bearings 306 slide up and down along the four cylindrical guide rails 202 respectively, forming a precise linear motion pair. The linear motion pair composed of the four sliding bearings 306 and the four cylindrical guide rails 202 can ensure that the carriage unit 3 remains stable and without swaying when moving vertically up and down. The carriage unit 3, together with the roller bed unit 4 and the load of the car body, falls in the middle of the four linear motion pairs, and the force is evenly distributed without the problem of uneven load, thereby reducing the deformation and overall shaking of the lifting tower 1.

[0031] like Figure 1As shown, one end of the reinforcement unit 6 is connected to the lifting tower 1, and the other end is fixedly connected to the ground, forming a triangular stable structure. The reinforcement unit 6 is made of square steel pipe or I-beam. One end of it is fixed to the middle of the side of the box 105 of the lifting tower 1 by bolts or welding, and the other end is fixed to the workshop ground by anchor bolts. The reinforcement unit 6, the lifting tower 1 and the ground form a right triangle, and the geometric stability of the triangle is used to effectively reinforce the lifting tower 1. The reinforcement unit 6 can be set on the front, rear or sides of the lifting tower 1, and each lifting tower 1 can be equipped with one or more reinforcement units 6. During operation, the reinforcement unit 6 can resist the lateral bending deformation of the lifting tower 1 caused by eccentric load or inertial force, absorb vibration energy, thereby further reducing the overall sway of the hoist and improving the operational stability.

[0032] The working principle of this invention is: in actual use, such as Figure 3 As shown, when the geared motor 501 of the hoist starts working, it can realize the lifting and lowering switching between the carriage unit 3 and the roller bed unit 4 on the ground and in the air; the roller bed unit 4 can realize the horizontal input and output of the car body; when the whole is coordinated, it can realize the transfer of the car body from the ground conveyor line to the air conveyor line, or the transfer of the car body from the air conveyor line to the ground conveyor line.

[0033] When the car body needs to be lifted from the ground conveyor line to the overhead conveyor line, the specific working process is as follows: The car body is horizontally conveyed to the roller bed unit 4 via the ground conveyor line. The conveyor rollers of the roller bed unit 4 rotate, accurately conveying the car body to the predetermined position of the carriage unit 3. Then the roller bed unit 4 stops, and the car body is positioned on the carriage unit 3. The control system issues a lifting command, the reduction motor 501 starts, and its two output shafts rotate simultaneously in the same direction. The power is transmitted to the commutators 104 on both sides through the universal joint 503. The commutators 104 convert the horizontal rotation into vertical rotation, driving the two cylindrical camshafts 101 to rotate synchronously. When the cylindrical camshafts 101 rotate, the sidewalls of their helical grooves push the rollers 304. Since the initial section of the helical groove of the cylindrical camshafts 101 is a gradually changing pressure angle profile, the rollers 304 are subjected to a gradually increasing thrust when starting, achieving smooth acceleration and avoiding the production of sudden acceleration. The roller 304 moves upward along the spiral groove, driving the roller shaft 303, roller connecting seat 302 and carriage 301 to rise together. During the rising process, the sliding bearings 306 at the four corners of the carriage 301 slide along the cylindrical guide rail 202, providing precise vertical guidance for the carriage 301 and ensuring that the carriage 301 does not skew or wobble. When the roller 304 moves to the middle constant pressure section of the spiral groove, the roller 304 rises at a constant speed, and the carriage 301 and the carriage body move vertically smoothly. When the roller 304 moves to the end section of the spiral groove, the roller 304 is subjected to a gradually decreasing thrust, achieving smooth deceleration. When the roller 304 enters the horizontal groove position at the end of the spiral groove, the carriage unit 3 reaches the aerial conveying position, and the control system controls the reduction motor 501 to stop. The roller bed unit 4 starts, horizontally outputting the carriage body from the carriage unit 3 to the aerial conveying line, completing the rising and conveying task.

[0034] When the car body needs to be transferred from the overhead conveyor line to the ground conveyor line, the specific working process is as follows: The car body is horizontally transported from the overhead conveyor line to the roller bed unit 4. The roller bed unit 4 accurately transports the car body to the predetermined position of the carriage unit 3 and positions it. The control system issues a descent command, and the reduction motor 501 starts in reverse, driving the cylindrical camshaft 101 to rotate in reverse. When the cylindrical camshaft 101 rotates in reverse, the sidewall of the helical groove pushes the roller 304 downward. Since the initial section of the helical groove is a gradually changing pressure angle profile, the roller 304 accelerates smoothly when it starts. The roller 304 moves downward along the helical groove. The movement of the roller 304 causes the carriage unit 3 to descend smoothly. The cooperation between the sliding bearing 306 and the cylindrical guide rail 202 ensures the verticality and stability of the descent process. When the roller 304 moves to the middle constant pressure section of the spiral groove, the carriage unit 3 descends at a constant speed. When the roller 304 moves to the end section of the spiral groove, the roller 304 decelerates smoothly. When the roller 304 enters the horizontal groove position at the lower end of the spiral groove, the carriage unit 3 reaches the ground conveying position, and the reduction motor 501 stops. The roller bed unit 4 starts and horizontally outputs the car body from the carriage unit 3 to the ground conveying line, completing the descent and conveying task.

[0035] The high-precision lifting machine of this invention has multiple precision protection mechanisms:

[0036] (1) The cylindrical camshaft 101 has horizontal grooves at both ends of the spiral groove. When the roller 304 is in the horizontal groove position, even if the cylindrical camshaft 101 rotates slightly, the roller 304 will not produce vertical displacement. Therefore, the ground conveying position and the air conveying position have self-locking characteristics and extremely high repeatability.

[0037] (2) The machining accuracy of the spiral groove can reach IT6 level. There is a precise linear relationship between the rotation angle of the cylindrical camshaft 101 and the displacement of the roller 304. With the encoder feedback of the servo motor, high-precision position control of the entire stroke can be achieved.

[0038] (3) The linear motion pair consisting of four sliding bearings 306 and four cylindrical guide rails 202 can have a clearance that can be controlled within the range of 0.01-0.03mm to ensure that the vertical motion trajectory of the carriage unit 3 is accurate.

[0039] Through the above-mentioned multiple precision assurance mechanisms, the repeatability of the ground conveying position and the aerial conveying position of the high-precision hoist of the present invention can reach ±0.1 mm, which is much higher than the ±2-5 mm of the existing two-column belt hoist.

[0040] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw-in," "pad," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A high-precision hoist, characterized in that, include: Elevating towers (1), two of which are arranged opposite each other; Linear guide units (2) are respectively installed on the two lifting towers (1); A carriage unit (3) is disposed between the two lifting towers (1); The roller bed unit (4) is mounted on the carriage unit (3); A geared motor unit (5) is used to drive the carriage unit (3) to lift and lower. The reinforcement unit (6) is used to reinforce the lifting tower (1); The geared motor unit (5) drives the transmission mechanism inside the lifting tower (1), causing the slide unit (3) and the roller bed unit (4) to move vertically up and down along the linear guide unit (2).

2. The high-precision hoist according to claim 1, characterized in that, The lifting tower (1) includes a cylindrical camshaft (101), a bearing (102), a bearing housing (103), a commutator (104), a housing (105), and a base plate (106). The housing (105) serves as a load-bearing structure. The cylindrical camshaft (101) is vertically installed inside the housing (105). The bearing (102) is installed at both ends of the cylindrical camshaft (101) and supports its rotation. The bearing housing (103) is fixed to the top of the housing (105) and cooperates with the upper bearing (102). The commutator (104) is fixed to the bottom of the housing (105). The base plate (106) is fixed to the bottom of the housing (105) and is used for installation on the ground. The journal of the cylindrical camshaft (101) cooperates with the inner ring of the bearing (102). The lower end of the cylindrical camshaft (101) is connected to the output hole of the commutator (104).

3. A high-precision hoist according to claim 2, characterized in that, The cylindrical camshaft (101) has a spiral groove around its shaft. The starting and ending sections of the spiral groove are concave contour lines with a gradually changing pressure angle, and the middle section is a concave contour line with a constant pressure angle.

4. A high-precision hoist according to claim 2, characterized in that, The geared motor unit (5) includes a geared motor (501) and a universal joint (503). The geared motor (501) has two output shafts. The geared motor (501) is fixed between the two lifting towers (1) by a motor mounting plate (502). The two output shafts of the geared motor (501) are respectively connected to the horizontal input shafts of the commutator (104) of the two lifting towers (1) through the universal joint (503).

5. A high-precision hoist according to claim 2, characterized in that, The linear guide unit (2) includes a cylindrical guide rail (202), which is vertically installed between the guide rail fixing seat (201) and the guide rail connecting seat (203). The guide rail fixing seat (201) is fixed on the foot plate (106), and the guide rail connecting seat (203) is fixed on the top of the lifting tower (1).

6. A high-precision hoist according to claim 5, characterized in that, The carriage unit (3) includes a carriage (301), a roller shaft (303), a roller (304), a sliding seat (305), and a sliding bearing (306). The carriage (301) is located between the two lifting towers (1). The roller shaft (303) is installed at both ends of the carriage (301) through a roller connecting seat (302). The roller (304) is fixed to the end of the roller shaft (303) and cooperates with the helical groove of the cylindrical camshaft (101). The sliding seat (305) is installed at the four corners of the carriage (301). The sliding bearing (306) is installed in each of the sliding seats (305) and slides in cooperation with the cylindrical guide rail (202).

7. A high-precision hoist according to claim 1, characterized in that, One end of the reinforcement unit (6) is connected to the lifting tower (1), and the other end is fixedly connected to the ground to form a triangular stable structure.

8. A high-precision hoist according to claim 4, characterized in that: The cylindrical camshafts (101) of the two lifting towers (1) are arranged symmetrically from left to right, and the spiral grooves of the two are mirror symmetrical, so that when the geared motor (501) drives, the two cylindrical camshafts (101) rotate synchronously, driving the carriage unit (3) to rise or fall simultaneously.

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