An endless circulating conveyor for sofa production

Abstract

The present application relates to a kind of annular circulating conveying device for sofa production, including rack, intelligent suspension conveying system being arranged above the rack, annular track mechanism being arranged on the rack and constituting closed circulation path and multiple bearing stations for placing sofa frame or sofa semi-finished product being arranged in sequence on annular track mechanism, multiple bearing stations can move along annular track mechanism;It also includes drive unit, and drive unit is composed of two groups of pulley mechanism.The present application is easily taken out old synchronous belt and installed new synchronous belt by setting pulley mechanism without disassembling any pulley component, operation steps are greatly simplified, and one person can complete, replacement time is significantly shortened, while single sector can be independently fine-tuned, effectively compensate local wear or installation error, prolong the overall service life of pulley.

Description

Technical Field

[0001] This invention relates to the field of sofa production equipment technology, specifically to a ring-shaped circulating conveyor device for sofa production. Background Technology

[0002] In the sofa manufacturing process, the processes of laying the sofa frame, installing springs, pasting foam, and covering fabric are usually completed sequentially along the production line. For ease of description, the term "sofa" in this application refers to the general term for sofa frames, semi-finished sofas, or finished sofas. In order to improve production efficiency and reduce workshop floor space, circular conveyor systems are widely used in sofa production lines. Such devices typically include a closed circular track, several carrying stations (for placing sofas), and a drive system. The drive system drives the carrying stations to circulate along the circular track via synchronous belt transmission, conveying the sofas sequentially to each processing station to achieve assembly line operation. In the prior art, the drive system of the above-mentioned annular circulating conveyor typically adopts a synchronous belt drive structure, which mainly consists of a driving synchronous pulley, a driven synchronous pulley, and a synchronous belt wrapped between the two; the driving synchronous pulley is mounted on the output shaft of the drive motor, the driven synchronous pulley is mounted at the far end of the frame, and the synchronous belt is tensioned between the two pulleys; However, in actual production and maintenance, this structure has a long-overlooked but frequently occurring defect: both the driving and driven synchronous pulleys are integrally formed metal wheels with fixed and non-adjustable diameters. When the synchronous belt needs to be replaced due to wear, elongation, or breakage from long-term operation, because the synchronous belt is a closed-loop structure and the outer diameter of the pulley is larger than the shaft diameter and cannot be changed, the operator must first completely remove the driving or driven pulley from the drive shaft, or remove the entire bearing housing and tensioning mechanism, including disassembling the axial fixing parts of the pulley (such as lock nuts and pressure plates), key connectors, and even loosening the bolts of the motor base or bearing housing, before the old synchronous belt can be removed from the pulley and a new synchronous belt can be fitted on. The operation steps are cumbersome. Summary of the Invention

[0003] The purpose of this invention is to provide a circular conveyor device for sofa production.

[0004] The objective of this invention is achieved through the following technical solution: a circular conveying device for sofa production, comprising a frame, an intelligent suspended conveying system disposed above the frame, a circular track mechanism disposed on the frame to form a closed loop path, and multiple bearing stations arranged sequentially on the circular track mechanism for placing sofa frames or semi-finished sofa products, the multiple bearing stations being movable along the circular track mechanism; It also includes a drive unit, which consists of two sets of pulley mechanisms; Each pulley mechanism includes a mounting cylinder mounted on the frame, multiple telescopic holes on the surface of the mounting cylinder, a connecting rod slidably connected to the telescopic holes, a sector block fixedly connected to one end of the connecting rod, a first elastic element between the sector block and the mounting cylinder, a mounting block slidably connected to the mounting cylinder, multiple comma blocks rotatably connected to the inner cavity of the mounting block, and a mating arc surface on one end of the connecting rod that mates with the surface of the comma blocks.

[0005] The pulley mechanism further includes multiple guide grooves opened at one end of the mounting cylinder, a connecting frame slidably connected in the guide grooves, a connecting plate disposed in the connecting frame, multiple second elastic members disposed between the connecting frame and the connecting plate, an elastic sheet disposed in the connecting plate, a locking block fixedly connected to the surface of the elastic sheet, and multiple locking holes opened on the surface of the connecting frame. One end of the connecting plate is fixedly connected to the surface of the comma block, and the multiple locking holes are distributed in a ring along the rotation path of the comma block. One end of the connecting frame is fixedly connected to one end of the mounting block.

[0006] Each of the comma blocks has multiple protrusions fixedly connected to its surface. The surface of the mating arc surface is provided with a wave groove that matches the protrusion. When the comma block rotates, the protrusion slides along the wave groove, causing the connecting rod and the fan-shaped block to vibrate periodically, thereby shaking off debris from the outer tooth groove of the fan-shaped block.

[0007] The inner cavity of the mounting cylinder is threaded with a screw rod. One end of the screw rod extends into the inner cavity of the mounting cylinder, and the extended end of the screw rod is connected to the inner cavity of the mounting block through a bearing. When the screw rod is rotated, the screw rod drives the mounting block to move axially along the mounting cylinder, causing all the comma blocks to move synchronously, thereby synchronously adjusting the radial extension length of all the sector blocks.

[0008] The drive unit also includes a synchronous belt sleeved on the two sets of pulley mechanisms and a drive component located at one end of the pulley mechanism. The drive component is a servo motor, and its output shaft is connected to the mounting cylinder of one of the pulley mechanisms.

[0009] The number of sector blocks is eight, and they are evenly distributed along the circumference of the mounting cylinder; the number of comma blocks is the same as the number of sector blocks and they correspond one-to-one; the mating arc surface is a concave arc surface, and its radius of curvature matches the radius of the outer circumference of the comma block.

[0010] When the comma block rotates relative to the mounting block, its outer circumferential surface pushes the connecting rod to move radially along the telescopic hole through the mating arc surface, thereby adjusting the extension length of the sector block.

[0011] The locking block can be selectively inserted into any locking hole under the elastic force of the elastic sheet, and is used to lock the connecting plate and the comma block at a preset rotation angle position. Compared with the prior art, the advantages of the present invention are as follows: 1. This invention, through the setting of a pulley mechanism, allows the mounting block to move axially along the mounting cylinder, causing all comma blocks to move synchronously. The outer circumferential surface of the comma blocks pushes the connecting rod to move radially along the telescopic hole through the mating arc surface. The connecting rod then causes the sector blocks to expand and contract radially synchronously, thereby changing the working diameter of the pulley. When the timing belt needs to be replaced, simply reducing the diameter of the pulley mechanism allows the old timing belt to be easily removed and the new timing belt to be installed without disassembling any pulley components. The operation steps are greatly simplified, can be completed by a single person, and the replacement time is significantly shortened. Simultaneously, when the operator presses the elastic plate, the elastic plate springs back. The elastic plate deforms and causes the locking block to exit from the locking hole, releasing the locking of the connecting plate. Then, the connecting plate is rotated, causing the comma block fixedly connected to it to rotate independently. The eccentric outer circumferential surface of the comma block pushes the corresponding connecting rod to move radially along the telescopic hole through the mating arc surface. The connecting rod causes the sector block to change its extension length independently. After adjustment, the elastic plate is released, and the locking block automatically inserts into the locking hole under the elastic force of the elastic plate, locking the angle of the comma block. Through the above operations, individual sector blocks can be independently fine-tuned, effectively compensating for local wear or installation errors and extending the overall service life of the pulley.

[0012] 2. This invention features a protrusion on the surface of a comma block and a wave groove on the mating arc surface. When the comma block rotates, the protrusion moves along the undulating trajectory of the wave groove. The varying height of the bottom of the wave groove forces the protrusion to perform a push-pull motion as it rotates with the comma block. When the protrusion reaches the crest of the wave, it pushes the connecting rod outward; when it reaches the trough, it allows the connecting rod to retract inward under the tension of the first elastic element. This alternating push-pull motion causes the connecting rod to drive the sector block to produce periodic extension and contraction vibrations, thereby automatically shaking off debris such as wood chips and sponge chips accumulated in the outer tooth groove of the sector block. This self-cleaning process is automatically completed during each diameter adjustment (whether synchronous or individual fine-tuning) without additional operation, effectively avoiding the impact of dust accumulation on meshing reliability. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the driving unit according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the pulley mechanism according to an embodiment of the present invention; Figure 4 This is a cross-sectional view of the pulley mechanism according to an embodiment of the present invention; Figure 5 This is a schematic diagram showing the disassembly of the mounting cylinder and mounting block according to an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the interaction between the comma block and the mounting block in an embodiment of the present invention; Figure 7This is a schematic diagram showing the separation of the comma block and the mounting block in an embodiment of the present invention; Figure 8 This is a schematic diagram of the wave groove structure according to an embodiment of the present invention. Labeling Explanation: 1. Frame; 101. Circular Track Mechanism; 102. Bearing Station; 2. Mounting Cylinder; 201. Telescopic Hole; 202. Connecting Rod; 203. Sector Block; 204. First Elastic Component; 205. Mounting Block; 206. Comma Block; 207. Mating Arc Surface; 3. Guide Groove; 301. Connecting Frame; 302. Connecting Plate; 303. Second Elastic Component; 304. Elastic Sheet; 305. Locking Block; 306. Locking Hole; 4. Protrusion; 401. Wave Groove; 5. Screw. Detailed Implementation

[0014] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: like Figure 1-8 The diagram shown is a schematic representation of an embodiment of a circular conveying device for sofa production provided by the present invention. It includes a frame 1, an intelligent suspended conveying system disposed above the frame 1, a circular track mechanism 101 disposed on the frame 1 to form a closed loop path, and multiple bearing stations 102 arranged sequentially on the circular track mechanism 101 for placing sofa frames or sofa semi-finished products. The multiple bearing stations 102 can move along the circular track mechanism 101. It also includes a drive unit, which consists of two sets of pulley mechanisms; Each pulley mechanism includes a mounting cylinder 2 mounted on the frame 1, multiple telescopic holes 201 formed on the surface of the mounting cylinder 2, a connecting rod 202 slidably connected to the telescopic holes 201, a sector block 203 fixedly connected to one end of the connecting rod 202, a first elastic element 204 between the sector block 203 and the mounting cylinder 2, a mounting block 205 slidably connected to the mounting cylinder 2, multiple comma blocks 206 rotatably connected to the inner cavity of the mounting block 205, and a mating arc surface 207 formed at one end of the connecting rod 202 that mates with the surface of the comma block 206.

[0015] The pulley mechanism also includes multiple guide grooves 3 opened at one end of the mounting cylinder 2, a connecting frame 301 slidably connected in the guide grooves 3, a connecting plate 302 disposed in the connecting frame 301, multiple second elastic elements 303 disposed between the connecting frame 301 and the connecting plate 302, an elastic sheet 304 disposed in the connecting plate 302, a locking block 305 fixedly connected to the surface of the elastic sheet 304, and multiple locking holes 306 opened on the surface of the connecting frame 301. One end of the connecting plate 302 is fixedly connected to the surface of the comma block 206, and the multiple locking holes 306 are distributed in a ring along the rotation path of the comma block 206. One end of the connecting frame 301 is fixedly connected to one end of the mounting block 205.

[0016] Each comma block 206 has multiple protrusions 4 fixedly connected to its surface. The surface of the arc surface 207 is provided with a wave groove 401 that matches the protrusions 4. When the comma block 206 rotates, the protrusions 4 slide along the wave groove 401, causing the connecting rod 202 and the fan-shaped block 203 to vibrate periodically, so as to shake off the debris in the outer tooth groove of the fan-shaped block 203.

[0017] The inner cavity of the mounting cylinder 2 is threaded with a screw 5. One end of the screw 5 extends into the inner cavity of the mounting cylinder 2, and the extended end of the screw 5 is connected to the inner cavity of the mounting block 205 through a bearing. When the screw 5 is rotated, the screw 5 drives the mounting block 205 to move axially along the mounting cylinder 2, which drives all the comma blocks 206 to move synchronously, thereby synchronously adjusting the radial extension length of all the sector blocks 203.

[0018] The drive unit also includes a synchronous belt sleeved on the two sets of pulley mechanisms and a drive component located at one end of the pulley mechanism. The drive component is a servo motor, and its output shaft is connected to the mounting cylinder 2 of one of the pulley mechanisms.

[0019] There are eight sector blocks 203, which are evenly distributed along the circumference of the mounting cylinder 2; the number of comma blocks 206 is the same as the number of sector blocks 203 and corresponds one-to-one. The mating arc surface 207 is a concave arc surface, and its radius of curvature matches the radius of the outer circumference of the comma block 206.

[0020] When the comma block 206 rotates relative to the mounting block 205, its outer circumferential surface pushes the connecting rod 202 to move radially along the telescopic hole 201 through the mating arc surface 207, so as to adjust the extension length of the sector block 203.

[0021] Under the elastic force of the elastic piece 304, the locking block 305 can be selectively inserted into any locking hole 306 to lock the connecting plate 302 and the comma block 206 at a preset rotation angle position.

[0022] Working principle The circular conveyor device of this solution is mainly used for the circular conveying of sofa frames or semi-finished products between various workstations on the sofa production line. The entire device is supported by a frame 1, and an intelligent suspended conveyor system is installed above the frame 1 (this part is existing technology and is mainly used to hoist sofa frames or semi-finished products onto the carrying workstation 102. For its specific structure and working process, please refer to existing literature, and this invention will not elaborate further). A circular track mechanism 101 forming a closed loop is installed on the frame 1, and multiple carrying workstations 102 are arranged sequentially on the track. Each carrying workstation 102 is used to place a sofa frame or semi-finished product and can move along the circular track mechanism 101.

[0023] To drive the movement of the bearing station 102, this solution sets up a drive unit; the drive unit includes two sets of identical pulley mechanisms (equivalent to a driving pulley and a driven pulley), and a synchronous belt is fitted between the two sets of pulley mechanisms; one set of pulley mechanisms is connected to the drive component (servo motor), and the output shaft of the motor drives the mounting cylinder 2 of the pulley mechanism to rotate, and transmits the power to the other set of pulley mechanisms through the synchronous belt, thereby driving the entire conveyor line to run.

[0024] The internal structure and working process of one set of pulley mechanisms are described in detail below: The core component of each pulley mechanism is a cylindrical mounting cylinder 2, which is fixed to the frame 1. Multiple telescopic holes 201, penetrating the wall thickness, are opened on the circumferential wall of the mounting cylinder 2. These holes are evenly distributed along the circumference. A connecting rod 202 that can slide radially is inserted into each telescopic hole 201. A sector block 203 is fixedly connected to the outer end of the connecting rod 202 (the end away from the center of the mounting cylinder 2). The outer arc surfaces of all sector blocks 203 are assembled together to form a complete cylindrical surface. The cylindrical surface is machined with toothed grooves for meshing with the timing belt.

[0025] A first elastic element 204 (e.g., a helical spring) is provided between the sector block 203 and the outer wall of the mounting cylinder 2. The function of this elastic element is to always apply a pulling force to the sector block 203 in the direction of the center of the mounting cylinder 2, so that the mating arc surface 207 of the inner end of the connecting rod 202 can be tightly attached to the outer circumferential surface of the comma block 206, eliminating gaps and ensuring the smoothness of transmission.

[0026] Inside the cavity of the mounting cylinder 2, a mounting block 205 that can slide axially is provided; multiple comma blocks 206 are mounted on the mounting block 205, the number of comma blocks 206 being the same as the number of sector blocks 203 (e.g., eight), each comma block 206 being mounted on the mounting block 205 via a pivot and being able to rotate freely around its own axis; the comma block 206 has an eccentric shape (similar to a comma), that is, its rotation center does not coincide with its geometric center; therefore, when the comma block 206 rotates around its own axis, the distance between its outer circumference and the rotation center (i.e., the radial radius) will change.

[0027] Each connecting rod 202 has a concave mating arc surface 207 machined at its inner end. The radius of curvature of this arc surface matches the radius of the outer circumference of the comma block 206, so that the outer circumference of the comma block 206 can fit against the mating arc surface 207.

[0028] When it is necessary to increase or decrease the working diameter of the pulley as a whole (e.g., to replace a timing belt of different length or adjust the tension), the operator rotates the screw 5; the screw 5 is threaded onto the end cover of the mounting cylinder 2, and its inner end is connected to the mounting block 205 through a bearing; when the screw 5 is rotated, the screw 5 will push or pull the mounting block 205 to move axially along the mounting cylinder 2; since all the comma blocks 206 are mounted on the mounting block 205, all the comma blocks 206 will move axially synchronously with the mounting block 205.

[0029] When the comma block 206 moves axially, its outer circumferential surface fits against the mating arc surface 207, and the connecting rod 202, where the mating arc surface 207 is located, can only slide radially. Therefore, the axial movement of the comma block 206 is converted into a radial thrust on the connecting rod 202. Specifically, when the mounting block 205 moves in a certain direction, the eccentric contour of the comma block 206 forces the connecting rod 202 to extend outward or retract inward along the telescopic hole 201, thereby driving the sector blocks 203 to move radially synchronously. The amount of movement of all sector blocks 203 is exactly the same, so the working diameter of the pulley changes uniformly. The first elastic element 204 always provides a contacting force during this process, ensuring that the mating arc surface 207 and the comma block 206 do not separate.

[0030] After long-term use, wear of the tooth grooves of individual sector blocks 203 or installation errors may cause the pulley to be partially out of round; at this time, it is necessary to fine-tune the radial position of each individual sector block 203.

[0031] Before fine-tuning, the locking state of the comma block 206 corresponding to the sector block 203 needs to be released first. Multiple guide grooves 3 (corresponding to the positions of each comma block 206) are provided on the end face of the mounting cylinder 2. A connecting frame 301 that can slide axially is installed in each guide groove 3 (the connecting frame 301 is fixedly connected to the mounting block 205 and serves as a guide). A connecting plate 302 is provided inside the connecting frame 301, and one end of the connecting plate 302 is fixedly connected to the end of the rotating shaft of the corresponding comma block 206. Therefore, the connecting plate 302 and the comma block 206 can rotate synchronously; a plurality of second elastic elements 303 are provided between the connecting plate 302 and the connecting frame 301, and these springs press the connecting plate 302 against the middle of the connecting frame 301; a piece of elastic sheet 304 is also embedded inside the connecting plate 302, and a protruding locking block 305 is fixed on the surface of the elastic sheet 304; a plurality of locking holes 306 are provided on the surface of the connecting frame 301 along the circumferential direction of the rotation of the comma block 206.

[0032] In the locked state, the elastic force of the elastic piece 304 presses the locking block 305 into one of the locking holes 306, thereby preventing the connecting plate 302 from rotating relative to the connecting frame 301, thus locking the rotation angle of the comma block 206.

[0033] When a fine adjustment of a single sector block 203 is required, the operator presses the elastic plate 304 at that station, causing the elastic plate 304 to deform elastically and drive the locking block 305 out of the locking hole 306. At this time, the connecting plate 302 and the connecting frame 301 are unlocked, and the connecting plate 302 can rotate freely. The operator rotates the connecting plate 302 by hand, and the connecting plate 302 drives the comma block 206 fixedly connected to it to rotate together. When the comma block 206 rotates, the contact point between its outer circumferential surface and the mating arc surface 207 changes. Due to the eccentric effect, it will push the connecting rod 202 to move a small distance radially, thereby changing the extension length of the sector block 203 individually. After adjusting to the appropriate position, the elastic plate 304 is released, and the elastic plate 304 returns to its original shape. Under the action of elastic force, the locking block 305 automatically inserts into the locking hole 306 corresponding to the current position, relocking the angle of the comma block 206 and preventing it from loosening due to vibration during operation.

[0034] During the rotation of the comma block 206 (whether for synchronous adjustment or individual fine-tuning), multiple protrusions 4 are fixed on the surface of each comma block 206, while a wave-shaped groove 401 is formed on the surface of the mating arc surface 207; the protrusions 4 are embedded in the wave groove 401; when the comma block 206 rotates, the protrusions 4 are forced to move along the undulating trajectory of the wave groove 401; since the bottom of the wave groove 401 has a height difference in the circumferential direction, the protrusions 4, while rotating with the comma block 206, will generate a back-and-forth pushing and pulling motion relative to the connecting rod 202 along the axial direction of the telescopic hole 201, specifically... In short: when the protrusion 4 moves to the crest of the wave groove 401, the protrusion 4 pushes the connecting rod 202 outward (i.e., the sector block 203 extends); when the protrusion 4 moves to the trough, the protrusion 4 allows the connecting rod 202 to retract inward under the pulling force of the first elastic element 204. This alternating pushing and pulling action causes the connecting rod 202 and the sector block 203 to generate periodic extension and contraction vibrations; this vibration can effectively shake off the sawdust, sponge shavings and other debris accumulated in the outer tooth groove of the sector block 203, avoiding the debris from affecting the meshing of the synchronous belt and the pulley, and realizing automatic cleaning during the adjustment process.

[0035] The output shaft of the drive unit (servo motor) is connected to the mounting cylinder 2 of one of the pulley mechanisms. After the motor starts, it drives the mounting cylinder 2 to rotate. The mounting cylinder 2 drives the sector block 203 to rotate through the connecting rod 202. The outer tooth groove of the sector block 203 meshes with the synchronous belt, thereby driving the synchronous belt to move. The synchronous belt then drives another set of pulley mechanisms to rotate. At the same time, it drives the bearing station 102 to move cyclically along the circular track mechanism 101 through a separable coupling structure (such as a friction pusher). The sofa frame or semi-finished product on the bearing station 102 passes through each processing station in sequence to complete the processes such as base layering, spring installation, and sponge pasting.

[0036] When it is necessary to replace the timing belt or adjust the tension, the timing belt can be easily installed or removed without disassembling the pulley by changing the diameter of the pulley through the above-mentioned timing adjustment function, which simplifies the maintenance operation.

Claims

1. A circular conveying device for sofa production, comprising a frame (1), an intelligent suspended conveying system disposed above the frame (1), a circular track mechanism (101) disposed on the frame (1) to form a closed loop path, and multiple bearing stations (102) arranged sequentially on the circular track mechanism (101) for placing sofa frames or sofa semi-finished products, the multiple bearing stations (102) being movable along the circular track mechanism (101); Its features are: It also includes a drive unit, which consists of two sets of pulley mechanisms; Each pulley mechanism includes a mounting cylinder (2) mounted on the frame (1), multiple telescopic holes (201) opened on the surface of the mounting cylinder (2), a connecting rod (202) slidably connected in the telescopic holes (201), a sector block (203) fixedly connected to one end of the connecting rod (202), a first elastic element (204) between the sector block (203) and the mounting cylinder (2), a mounting block (205) slidably connected in the mounting cylinder (2), multiple comma blocks (206) rotatably connected in the cavity of the mounting block (205), and a mating arc surface (207) opened at one end of the connecting rod (202) and mating with the surface of the comma block (206).

2. The annular circulating conveyor device for sofa production according to claim 1, characterized in that: The pulley mechanism further includes multiple guide grooves (3) opened at one end of the mounting cylinder (2), a connecting frame (301) slidably connected in the guide grooves (3), a connecting plate (302) provided in the connecting frame (301), multiple second elastic elements (303) provided between the connecting frame (301) and the connecting plate (302), an elastic sheet (304) provided in the connecting plate (302), a locking block (305) fixedly connected to the surface of the elastic sheet (304), and multiple locking holes (306) opened on the surface of the connecting frame (301). One end of the connecting plate (302) is fixedly connected to the surface of the comma block (206), and the multiple locking holes (306) are distributed in a ring along the rotation path of the comma block (206). One end of the connecting frame (301) is fixedly connected to one end of the mounting block (205).

3. The annular circulating conveyor device for sofa production according to claim 2, characterized in that: Each of the comma blocks (206) has multiple protrusions (4) fixedly connected to its surface. The surface of the mating arc surface (207) is provided with a wave groove (401) that matches the protrusion (4). When the comma block (206) rotates, the protrusion (4) slides along the wave groove (401), causing the connecting rod (202) and the fan-shaped block (203) to vibrate periodically, so as to shake off the debris in the outer tooth groove of the fan-shaped block (203).

4. The annular circulating conveyor device for sofa production according to claim 3, characterized in that: The inner cavity of the mounting cylinder (2) is threaded with a screw (5). One end of the screw (5) extends into the inner cavity of the mounting cylinder (2), and the extended end of the screw (5) is connected to the inner cavity of the mounting block (205) through a bearing. When the screw (5) is rotated, the screw (5) drives the mounting block (205) to move axially along the mounting cylinder (2), thereby causing all comma blocks (206) to move synchronously, thus synchronously adjusting the radial extension length of all sector blocks (203).

5. A circular conveyor device for sofa production according to claim 4, characterized in that: The drive unit also includes a synchronous belt sleeved on the two sets of pulley mechanisms and a drive component located at one end of the pulley mechanism. The drive component is a servo motor, and its output shaft is connected to the mounting cylinder (2) of one of the pulley mechanisms.

6. A circular conveyor device for sofa production according to claim 5, characterized in that: The number of the sector blocks (203) is eight, and they are evenly distributed along the circumference of the mounting cylinder (2); the number of the comma blocks (206) is the same as the number of the sector blocks (203) and they correspond one-to-one; the mating arc surface (207) is a concave arc surface, and its radius of curvature matches the radius of the outer circumference of the comma block (206).

7. A circular conveyor device for sofa production according to claim 6, characterized in that: When the comma block (206) rotates relative to the mounting block (205), its outer circumferential surface pushes the connecting rod (202) to move radially along the telescopic hole (201) through the mating arc surface (207) to adjust the extension length of the sector block (203).

8. A circular conveyor device for sofa production according to claim 7, characterized in that: The locking block (305) can be selectively inserted into any locking hole (306) under the elastic force of the elastic sheet (304) to lock the connecting plate (302) and the comma block (206) at a preset rotation angle position.

Images