CN214425574U

CN214425574U - Height adjusting device

Info

Publication number: CN214425574U
Application number: CN202120054003.9U
Authority: CN
Inventors: 梁启明
Original assignee: Xd Precision Machinery Dongguan Co ltd
Current assignee: Xd Precision Machinery Dongguan Co ltd
Priority date: 2021-01-10
Filing date: 2021-01-10
Publication date: 2021-10-19
Anticipated expiration: 2031-01-10

Abstract

The utility model relates to a height adjusting device, which comprises a back plate, the front of backplate is fixed with leads smooth slide rail, it leads smooth slider to be equipped with on the smooth slide rail to lead, lead and be connected with the part that needs height-adjusting on the smooth slider, still including fixing the guide block at the backplate back, be provided with height adjusting block on the guide block, height adjusting block is driven and can be followed by actuating mechanism the guide block removes. Compared with the prior art, the utility model discloses a moving motor drives and carries out altitude mixture control, leads smooth slider to drive the part that needs altitude mixture control and reciprocates along leading smooth slide rail, and the extension spring provides reverse pulling force at the removal in-process of leading smooth slider, and the removal of this pulling force opposition lead smooth slider prevents that its removal is too fast, improves altitude mixture control process's security and stability.

Description

Height adjusting device

Technical Field

The utility model relates to a height adjusting device belongs to mechanical technical field.

Background

In some automation equipment, the height of one mechanism needs to be adjusted in the operation process, so that the mechanism can be matched with other mechanisms more flexibly, but if the mechanism moves too fast in the process of moving up and down, the mechanism can collide with other mechanisms, and the mechanism is damaged.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the shortcoming of prior art, provide a height adjusting device.

For realizing the purpose the utility model adopts the technical proposal that:

the height adjusting device comprises a back plate, wherein a guide sliding rail is fixed on the front surface of the back plate, a guide sliding block is arranged on the guide sliding rail, and a part needing height adjustment is connected to the guide sliding block.

As a further optimization of the above technical solution: the back plate is characterized by further comprising a guide block fixed on the back face of the back plate, wherein a height adjusting slide block is arranged on the guide block, and the height adjusting slide block is driven by a driving mechanism and can move along the guide block.

As a further optimization of the above technical solution: the bottom of the height adjusting slide block is connected with a U-shaped connecting plate, the bottom of the back plate is provided with two limiting grooves, and an opening of the U-shaped connecting plate penetrates through the limiting grooves and is connected with the sliding guide slide block.

As a further optimization of the above technical solution: fixed cover is installed to height adjustment slider's bottom, be provided with compression spring in the fixed cover, compression spring's one end is fixed in the fixed cover, the other end is connected with the regulation post, it can reciprocate in the fixed cover to adjust the post, U type connecting plate is installed adjust the bottom of post.

As a further optimization of the above technical solution: and a sliding connecting plate is fixed on the sliding guide block, an opening of the U-shaped connecting plate is fixed at the bottom of the sliding connecting plate, and a part needing height adjustment is fixed on the sliding connecting plate.

As a further optimization of the above technical solution: the back face of the sliding connecting plate is fixedly provided with two lower spring rods, the back face of the sliding connecting plate is fixedly provided with two upper spring rods, and two ends of each of the two tension springs are respectively connected with the upper spring rods and the lower spring rods.

As a further optimization of the above technical solution: the driving mechanism is any one of an oil cylinder, an air cylinder, a lead screw transmission mechanism, a synchronous wheel transmission mechanism, a chain transmission mechanism or a composite transmission mechanism.

As a further optimization of the above technical solution: the screw rod transmission mechanism comprises a first screw rod and a first motor, the first screw rod comprises a first screw rod and a first nut in threaded fit with the first screw rod, the first screw rod is connected with a rotating shaft of the first motor through a coupler, a first induction rod is fixed on the height adjusting slider, and the first induction rod is connected with the first nut; the guide block is internally provided with a first cavity for mounting the screw rod transmission mechanism, a first screw rod is positioned in the first cavity, the first motor is mounted on the guide block or the rack, the guide block is provided with a first sliding hole, the first sliding hole is communicated with the first cavity, and the first induction rod penetrates through the first sliding hole and is connected with the first nut.

As a further optimization of the above technical solution: the synchronous wheel transmission mechanism comprises a second motor, a first transmission shaft and a second transmission shaft, the first transmission shaft is connected with a rotating shaft of the second motor, the arrangement directions of the first transmission shaft and the second transmission shaft are the same, the second transmission shaft and the first transmission shaft are arranged in parallel, first synchronous wheels are arranged on the first transmission shaft and the second transmission shaft, a first belt is sleeved between the two first synchronous wheels, a first connecting block is fixed on the first belt, a second induction rod is fixed on the height adjusting sliding block, and the second induction rod is connected with the first connecting block; the transmission block is installed to the one end of guide block, synchronizing wheel drive mechanism installs the transmission block with in the guide block, wherein first transmission shaft sets up in the transmission block, the second motor is installed on the transmission block and the perpendicular to the guide block sets up or installs in the frame, the system has the second cavity in the guide block, the second transmission shaft is located the second cavity is kept away from the one end of transmission block, still the system has the second sliding hole in the guide block, the second sliding hole with the second cavity intercommunication, the second response pole passes the second sliding hole and with first connecting block is connected.

As a further optimization of the above technical solution: the chain transmission mechanism comprises a third motor, a first gear and a second gear, a gear shaft of the first gear is connected with a rotating shaft of the third motor, the arrangement directions of the gear shaft of the first gear and the rotating shaft of the third motor are the same, a gear shaft of the second gear is arranged in parallel with the gear shaft of the first gear, a chain is sleeved between a gear disc of the first gear and a gear disc of the second gear, a second connecting block is fixed on the chain, a third induction rod is fixed on the height adjusting sliding block, and the third induction rod is connected with the second connecting block; the transmission block is installed to the one end of guide block, chain drive installs the transmission block with in the guide block, wherein first gear setting is in the transmission block, the third motor is installed on the transmission block and the perpendicular to the guide block sets up or installs in the frame, the system has the third cavity in the guide block, the second gear is located the third cavity is kept away from the one end of transmission block, it has the third sliding hole still to make in the guide block, the third sliding hole with the third cavity intercommunication, the third response pole passes the third sliding hole and with the second connecting block is connected.

As a further optimization of the above technical solution: the composite transmission mechanism comprises a fourth motor, a second screw rod, a third transmission shaft and a fourth transmission shaft, the second screw rod comprises a second screw rod and a second nut in threaded fit with the second screw rod, the third transmission shaft is connected with a rotating shaft in the fourth motor, the fourth transmission shaft is connected with the second screw rod, second synchronizing wheels are arranged on the third transmission shaft and the fourth transmission shaft, a second belt is sleeved between the two second synchronizing wheels, a fourth induction rod is fixed on the height adjusting slide block, and the fourth induction rod is connected with the second nut; install the transmission piece on the guide block, compound drive mechanism installs the transmission piece with in the guide block, wherein third transmission shaft and fourth transmission shaft are located in the transmission block, the system has the fourth cavity in the guide block, the second lead screw is located in the fourth cavity, the fourth motor is installed on the transmission block and be on a parallel with the guide block sets up or installs in the frame, the system has the fourth sliding hole on the guide block, the fourth sliding hole with the fourth cavity intercommunication, the fourth response pole passes the fourth sliding hole and with the second nut is connected.

As a further optimization of the above technical solution: install first spacing sensor, initial point sensor and the spacing sensor of second on the guide block, first spacing sensor, the spacing sensor of second are fixed respectively the both ends of guide block side, initial point sensor is located first spacing sensor with between the spacing sensor of second.

Compared with the prior art, the utility model discloses a moving motor drives and carries out altitude mixture control, leads smooth slider to drive the part that needs altitude mixture control and reciprocates along leading smooth slide rail, and the extension spring provides reverse pulling force at the removal in-process of leading smooth slider, and this pulling force confrontation is led the removal of smooth slider and is prevented that it from removing too fast, and compression spring and regulation post cooperation have played the effect of buffering to the process that reciprocates, improve altitude mixture control process's security and stability.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic structural view of another angle of the present invention.

Fig. 3 is a schematic diagram of the internal structure of the compound transmission mechanism of the present invention.

Fig. 4 is a schematic view of the internal structure of the middle synchronizing wheel transmission mechanism of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description. As shown in fig. 1 to 4, the height adjusting device includes a back plate 3101, a slide rail 3114 is fixed on the front surface of the back plate 3101, a slide block 3115 is arranged on the slide rail 3114, a slide connecting plate 3116 is fixed on the slide block 3115, and a member requiring height adjustment is fixed on the slide connecting plate 3116. The height adjusting device further comprises a guide block 3192 fixed on the back surface of the back plate 3101, an L-shaped height adjusting slider 3193 is arranged on the side edge of the guide block 3192, and the height adjusting slider 3193 is driven by a driving mechanism and can move along the guide block 3192. The driving mechanism is a compound transmission mechanism, as shown in fig. 1, 2 and 3, the compound transmission mechanism includes a fourth motor, a second screw, a third transmission shaft 93 and a fourth transmission shaft 94, and the screw functions to convert a rotary motion into a linear motion. The second lead screw includes second screw 91 and with second screw 91 screw-thread fit's second nut 92, third transmission shaft 93 is connected with the pivot in the fourth motor, the fourth transmission shaft is connected with second screw 91, the cover is equipped with second belt 95 between third transmission shaft 93 and the fourth transmission shaft 94. A fourth sensing rod 96 is fixed on the height adjusting slider 3193, and the fourth sensing rod 96 is connected with the second nut 92. The guide block 3192 is provided with a transmission block 3194, the composite transmission mechanism is arranged in the transmission block 3194 and the guide block 3192, the third transmission shaft 93 and the fourth transmission shaft 94 are positioned in the transmission block 3194, the guide block 3192 is provided with a fourth cavity, and the second screw rod is positioned in the fourth cavity. The fourth motor is arranged on the transmission block 3194 or the machine frame, and the fourth motor is a moving motor 3191. In this embodiment, the fourth motor is mounted on the transmission block 3194 and is arranged parallel to the guide block 3192, so that the influence of vibration of other parts on the rack on the fourth motor during operation is reduced; meanwhile, the fourth motor and other parts of the height adjusting device are combined to form an independent module, so that the installation and the disassembly are convenient. A fourth sliding hole is formed in the guide block 3192 and communicated with the fourth cavity, and a fourth induction rod 96 penetrates through the fourth sliding hole and is connected with the second nut 92. And starting the fourth motor, wherein a rotating shaft of the fourth motor drives the second screw 91 to rotate through the third transmission shaft 93, the second belt 95 and the fourth transmission shaft 94, the second screw 91 drives the second nut 92 to axially move along the second screw 91, and the second nut 92 drives the height adjusting slider 3193 and the fourth induction rod 96 to move along the guide block 3192. The driving mechanism is driven by a fourth motor, the noise is low, the fourth motor is arranged in parallel to the guide block 3192 through the transmission block 3194, the transverse size can be reduced, the vacant space of the vertical height is effectively utilized, and the occupied space of the whole machine can be reduced. The guide block 3192 is provided with a first limit sensor, an origin sensor and a second limit sensor, the first limit sensor and the second limit sensor are respectively fixed at two ends of one side surface of the guide block 3192, and the origin sensor is arranged at the other side surface of the guide block 3192 and is positioned between the first limit sensor and the second limit sensor. The first limit sensor, the origin sensor and the second limit sensor are used to sense the fourth sensing rod 96. The fourth motor drives the fourth induction rod 96 to move to be matched with the original point sensor, and when the original point sensor senses the fourth induction rod 96, the fourth motor resets to the original point. Then the fourth motor continues to drive the height adjusting sliding block 3193 and the fourth induction rod 96 to move; in the above process, when the first limit sensor senses the fourth sensing rod 96, the fourth motor stops moving; when the second limit sensor senses the fourth sensing rod 96, the fourth motor stops moving, so that the first limit sensor and the second limit sensor limit the movement of the height adjusting slider 3193.

As an alternative to the above-mentioned composite transmission mechanism, the driving mechanism may also be any one of an oil cylinder, an air cylinder, a screw rod transmission mechanism, a synchronous wheel transmission mechanism or a chain transmission mechanism.

When the device is replaced by an oil cylinder or an air cylinder, the oil cylinder or the air cylinder is arranged on the guide block 3192 or the rack, the oil cylinder directly or indirectly drives the height adjusting sliding block 3193 to move, and when the scheme is adopted, an original point inductor is not needed, and only an inductor matched with the first limiting sensor and the second limiting sensor is needed to be arranged on the height adjusting sliding block 3193. The advantage of this scheme is that the drive connection is simple in construction.

When replaced by the screw rod transmission mechanism, the screw rod transmission mechanism comprises a first screw rod and a first motor, the screw rod has the function of converting rotary motion into linear motion, the first screw rod comprises a first screw rod and a first nut in threaded fit with the first screw rod, and the first screw rod is connected with a rotating shaft of the first motor through a coupler. A first sensing rod is fixed on the height adjusting slider 3193 and connected with the first nut. A first cavity for mounting a lead screw transmission mechanism is formed in the guide block 3192, wherein the first lead screw is located in the first cavity. The first motor is mounted on the guide block 3192 or the frame, and the first motor is a moving motor 3191. In the embodiment, the first motor is arranged on the guide block 3192, so that the vibration influence of other parts on the rack when the first motor works is reduced; meanwhile, the first motor and other parts of the screw rod transmission mechanism are combined to form an independent module, so that the screw rod transmission mechanism is convenient to mount and dismount. The guide block 3192 is provided with a first sliding hole, the first sliding hole is communicated with the first cavity, and the first induction rod penetrates through the first sliding hole and is connected with the first nut. The screw rod transmission mechanism has the same advantages as the composite transmission mechanism, is driven by a motor and has low noise; compared with a composite transmission mechanism, the transmission mechanism has the advantages that the structure is simple, the first screw rod is matched with the first motor to realize rigid transmission, and the transmission is timely and rapid.

When the synchronous wheel transmission mechanism is used for replacing the synchronous wheel transmission mechanism, as shown in fig. 4, the synchronous wheel transmission mechanism comprises a second motor, a first transmission shaft 01 and a second transmission shaft 02, the rotating shafts of the first transmission shaft 01 and the second motor are connected, the arrangement directions of the first transmission shaft 01 and the second transmission shaft are the same, the second transmission shaft 02 and the first transmission shaft 01 are arranged in parallel, first synchronous wheels are arranged on the first transmission shaft 01 and the second transmission shaft 02, and a first belt 03 is sleeved between the two first synchronous wheels. A first connecting block 04 is fixed on the first belt 03, a second sensing rod is fixed on the height adjusting slider 3193, and the second sensing rod is connected with the first connecting block 04. One end of the guide block 3192 is provided with a transmission block 3194, the synchronizing wheel transmission mechanism is arranged in the transmission block 3194 and the guide block 3192, wherein the first transmission shaft 01 is arranged in the transmission block 3194, the second motor is arranged on the transmission block 3194 or a rack, and the second motor is a moving motor 3191. In this embodiment, the second motor is mounted on the transmission block 3194 and is perpendicular to the guide block 3192, so that the influence of vibration of other parts on the rack on the second motor during operation is reduced; meanwhile, the second motor and other parts of the synchronous wheel transmission mechanism are combined to form an independent module, so that the installation and the disassembly are convenient. A second cavity is formed in the guide block 3192, and the second transmission shaft 02 is located at an end of the second cavity away from the transmission block 3194. A second sliding hole is further formed in the guide block 3192, the second sliding hole is communicated with the second cavity, and the second sensing rod penetrates through the second sliding hole and is connected with the first connecting block 04. The advantages of the synchronous wheel transmission mechanism are the same as the composite transmission mechanism, and the synchronous wheel transmission mechanism is driven by a motor and has low noise; compared with a composite transmission mechanism, the flexible transmission mechanism has the advantages that the second motor is matched with the first transmission shaft 01, the second transmission shaft 02 and the first belt 03 to realize flexible transmission, the flexible transmission mechanism is safer, the second motor is perpendicular to the guide block 3192 through the transmission block 3194, the transverse size can be reduced, the vacant space in the vertical height is effectively utilized, and the occupied space of the whole machine can be reduced.

When the chain transmission mechanism is used for replacing the driving mechanism, the driving mechanism is the chain transmission mechanism, the chain transmission mechanism comprises a third motor, a first gear and a second gear, a gear shaft of the first gear is connected with a rotating shaft of the third motor, the arrangement directions of the gear shaft and the rotating shaft of the third motor are the same, and a gear shaft of the second gear is arranged in parallel with the gear shaft of the first gear. A chain is sleeved between the gear wheel disc of the first gear and the gear wheel disc of the second gear, a fourth connecting block is fixed on the chain, a third induction rod is fixed on the height adjusting sliding block 3193, and the third induction rod is connected with the fourth connecting block. One end of the guide block 3192 is provided with a transmission block 3194, a chain transmission mechanism is arranged in the transmission block 3194 and the guide block 3192, wherein a first gear is arranged in the transmission block 3194, a third motor is arranged on the transmission block 3194 or a rack, and the third motor is a moving motor 3191. In this embodiment, the third motor is mounted on the transmission block 3194 and is perpendicular to the guide block 3192, so that the influence of vibration of other parts on the rack on the third motor during operation is reduced; meanwhile, the third motor and other parts of the chain transmission mechanism are combined to form an independent module, so that the assembly and disassembly are convenient. A third cavity is formed in the guide block 3192, and the second gear is located at an end of the third cavity remote from the transmission block 3194. A third sliding hole is formed in the guide block 3192 and communicated with the third cavity, and a third induction rod penetrates through the third sliding hole and is connected with a fourth connecting block. The chain transmission mechanism has the same advantages as the composite transmission mechanism, is driven by a motor and has low noise; compared with a composite transmission mechanism, the flexible transmission mechanism has the advantages that the third motor is matched with the first gear, the second gear and the chain to realize flexible transmission, the flexible transmission mechanism is safer, the third motor is perpendicular to the guide block 3192 through the transmission block 3194, the transverse size can be reduced, the vacant space in the vertical height is effectively utilized, and the occupied space of the whole machine can be further reduced.

In the above technical scheme: the bottom of the transverse part of the L-shaped height adjusting slider 3193 is provided with a fixed sleeve 3120, a compression spring is arranged in the fixed sleeve 3120, one end of the compression spring is fixed in the fixed sleeve 3120, the other end of the compression spring is connected with an adjusting column 3121, and the adjusting column 3121 can move up and down in the fixed sleeve 3120. Adjust the effect that setting up of post 3121 and compression spring played the buffering to height control's process, earlier play the effect of compression to compression spring when height adjusting slider 3193 moves down, and the rethread compression spring passes on the part that needs height-adjusting with regulation post 3121, improves height-adjusting's security and stability. The bottom of the adjusting column 3121 is fixed with a U-shaped connecting plate 3117, the bottom of the back plate 3101 is provided with two vertically arranged limiting grooves 31011, the opening of the U-shaped connecting plate 3117 penetrates through the limiting grooves 31011 and is fixed at the bottom of the sliding connecting plate 3116, so that the height adjusting slider 3193 drives the sliding connecting plate 3116 to move up and down, and the sliding guide block 3115 and the sliding guide 3114 are matched to guide the sliding of the sliding connecting plate 3116.

In the above technical scheme: two tension springs 3113 are further arranged between the sliding connection plate 3116 and the back plate 3101, two lower tension spring rods are fixed on the back surface of the sliding connection plate 3116, two upper tension spring rods are fixed on the back plate 3101, and two ends of the tension springs 3113 are respectively connected with the upper and lower tension spring rods. When the moving motor 3191 moves the sliding connection plate 3116 downward, the tension spring 3113 is extended, and the tension spring 3113 simultaneously generates a counter force of the return form. The setting of extension spring 3113 plays the effect of buffering to the process of height control, prevents that sliding connection plate 3116 from moving down too fast and damaging the instrument.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, all should fall into the protection scope of the utility model, the technical scheme that the design of this technical field technical personnel according to the utility model can be obtained through logic analysis, reasoning or limited experiment on prior art's basis, all should fall into.

Claims

1. The height adjusting device is characterized by comprising a back plate (3101), wherein a guide sliding rail (3114) is fixed on the front surface of the back plate (3101), a guide sliding block (3115) is arranged on the guide sliding rail (3114), and a part needing height adjustment is connected to the guide sliding block (3115);

the back plate (3101) is characterized by further comprising a guide block (3192) fixed on the back surface of the back plate (3101), wherein a height adjusting sliding block (3193) is arranged on the guide block (3192), and the height adjusting sliding block (3193) is driven by a driving mechanism and can move along the guide block (3192);

the bottom of the height adjusting sliding block (3193) is connected with a U-shaped connecting plate (3117), the bottom of the back plate (3101) is provided with two limiting grooves (31011), and the opening of the U-shaped connecting plate (3117) penetrates through the limiting grooves (31011) and is connected with the sliding guide sliding block (3115).

2. The height adjusting device as claimed in claim 1, wherein a fixing cover (3120) is installed at the bottom of the height adjusting slider (3193), a compression spring is installed in the fixing cover (3120), one end of the compression spring is fixed in the fixing cover (3120), the other end of the compression spring is connected with an adjusting column (3121), the adjusting column (3121) can move up and down in the fixing cover (3120), and the U-shaped connecting plate (3117) is installed at the bottom of the adjusting column (3121).

3. The height adjusting apparatus according to claim 1, wherein a slide plate (3116) is fixed to the slide guide (3115), the U-shaped plate (3117) is fixed to the bottom of the slide plate (3116) at an opening thereof, and a member requiring height adjustment is fixed to the slide plate (3116).

4. The height adjusting device according to claim 3, wherein two tension springs (3113) are further disposed between the sliding connection plate (3116) and the back plate (3101), two lower tension spring rods are fixed on the back surface of the sliding connection plate (3116), two upper tension spring rods are fixed on the back plate (3101), and two ends of the tension springs (3113) are respectively connected with the upper and lower tension spring rods.

5. The height adjusting device according to claim 1, wherein the driving mechanism is any one of an oil cylinder, an air cylinder, a lead screw transmission mechanism, a synchronous wheel transmission mechanism, a chain transmission mechanism or a compound transmission mechanism;

the screw rod transmission mechanism comprises a first screw rod and a first motor, the first screw rod comprises a first screw rod and a first nut in threaded fit with the first screw rod, the first screw rod is connected with a rotating shaft of the first motor through a coupler, a first induction rod is fixed on the height adjusting sliding block (3193), and the first induction rod is connected with the first nut; a first cavity for mounting the screw rod transmission mechanism is formed in the guide block (3192), a first screw rod is positioned in the first cavity, the first motor is mounted on the guide block (3192) or the rack, a first sliding hole is formed in the guide block (3192) and communicated with the first cavity, and the first induction rod penetrates through the first sliding hole and is connected with the first nut;

the synchronous wheel transmission mechanism comprises a second motor, a first transmission shaft (01) and a second transmission shaft (02), the first transmission shaft (01) is connected with a rotating shaft of the second motor, the arrangement directions of the first transmission shaft and the second transmission shaft are the same, the second transmission shaft (02) is arranged in parallel with the first transmission shaft (01), the first transmission shaft (01) and the second transmission shaft (02) are both provided with first synchronous wheels, a first belt (03) is sleeved between the two first synchronous wheels, a first connecting block (04) is fixed on the first belt (03), a second induction rod is fixed on the height adjusting sliding block (3193), and the second induction rod is connected with the first connecting block (04); a transmission block (3194) is installed at one end of the guide block (3192), the synchronizing wheel transmission mechanism is installed in the transmission block (3194) and the guide block (3192), wherein a first transmission shaft (01) is arranged in the transmission block (3194), the second motor is installed on the transmission block (3194) and is arranged perpendicular to the guide block (3192) or is installed on a rack, a second cavity is formed in the guide block (3192), the second transmission shaft (02) is located at one end, away from the transmission block (3194), of the second cavity, a second sliding hole is further formed in the guide block (3192) and is communicated with the second cavity, and the second sensing rod penetrates through the second sliding hole and is connected with the first connecting block (04);

the chain transmission mechanism comprises a third motor, a first gear and a second gear, a gear shaft of the first gear is connected with a rotating shaft of the third motor, the arrangement directions of the gear shaft of the first gear and the rotating shaft of the third motor are the same, a gear shaft of the second gear is arranged in parallel with the gear shaft of the first gear, a chain is sleeved between a gear disc of the first gear and a gear disc of the second gear, a second connecting block is fixed on the chain, a third induction rod is fixed on the height adjusting sliding block (3193), and the third induction rod is connected with the second connecting block; a transmission block (3194) is installed at one end of the guide block (3192), the chain transmission mechanism is installed in the transmission block (3194) and the guide block (3192), a first gear is arranged in the transmission block (3194), the third motor is installed on the transmission block (3194) and is perpendicular to the guide block (3192) or is installed on a rack, a third cavity is formed in the guide block (3192), the second gear is located at one end, far away from the transmission block (3194), of the third cavity, a third sliding hole is further formed in the guide block (3192) and is communicated with the third cavity, and the third induction rod penetrates through the third sliding hole and is connected with the second connecting block;

the composite transmission mechanism comprises a fourth motor, a second screw rod, a third transmission shaft (93) and a fourth transmission shaft (94), the second screw rod comprises a second screw rod (91) and a second nut (92) in threaded fit with the second screw rod (91), the third transmission shaft (93) is connected with a rotating shaft in the fourth motor, the fourth transmission shaft (94) is connected with the second screw rod (91), second synchronizing wheels are arranged on the third transmission shaft (93) and the fourth transmission shaft (94), a second belt (95) is sleeved between the second synchronizing wheels, a fourth induction rod (96) is fixed on the height adjusting sliding block (3193), and the fourth induction rod (96) is connected with the second nut (92); the guide block (3192) is provided with a transmission block (3194), the composite transmission mechanism is arranged in the transmission block (3194) and the guide block (3192), a third transmission shaft (93) and a fourth transmission shaft (94) are positioned in the transmission block (3194), a fourth cavity is formed in the guide block (3192), the second lead screw is positioned in the fourth cavity, the fourth motor is arranged on the transmission block (3194) and is arranged in parallel to the guide block (3192) or is arranged on a rack, a fourth sliding hole is formed in the guide block (3192) and is communicated with the fourth cavity, and a fourth induction rod (96) penetrates through the fourth sliding hole and is connected with the second nut (92).

6. The height adjusting device according to any one of claims 1 to 5, wherein a first limit sensor, a home position sensor and a second limit sensor are mounted on the guide block (3192), the first limit sensor and the second limit sensor are respectively fixed at two ends of one side surface of the guide block (3192), and the home position sensor is located between the first limit sensor and the second limit sensor.