Axle housing turnover device with scrap iron collection function

Abstract

The utility model relates to bridge shell processing technical field, and disclose a bridge shell turnover device with scrap iron collection function, including platform frame, and the left workstation and right workstation at platform frame top, the upper portion of left workstation is provided with the protective cover, the inboard fixed mounting of left workstation lower part has the electric control box. This bridge shell turnover device with scrap iron collection function, can ensure that the turnover angle is accurate and consistent through the combination of ruler and pointer, solves the angle deviation problem of manual operation, V type support block adapts to different specifications bridge shell, and the symmetrical distribution support ball realizes balanced support, avoids the surface scratch and deformation caused by rigid support, after bridge shell overturns 180, the basin mouth is opposite to the blanking groove, scrap iron and cutting fluid can borrow gravity and flow into the rolling type collection car through the blanking groove, and the high pressure airflow of cooperation blowing assembly can completely remove the stubborn residue, reduce the subsequent cleaning burden and improve the machining accuracy, reduce the unqualified product rate and production risk as a whole.

Description

Technical Field

[0001] This utility model relates to the field of bridge shell processing technology, specifically a bridge shell flipping device with iron filings collection function. Background Technology

[0002] The axle housing is the core load-bearing and protective component of a car's drive axle. It is mainly used to enclose and support internal transmission components such as the final drive and differential, while also connecting the wheels to the chassis. It plays a dual role in transmitting power and bearing the weight of the entire vehicle. It must not only withstand the vertical load, longitudinal traction and braking force, and lateral roll force during vehicle operation, but also isolate internal precision components from impurities such as mud and water to prevent wear. It also precisely fixes the wheel position through journals or bearing seats to ensure driving stability. Common types are divided into integral and segmented types. The former has high rigidity and good sealing performance and is mostly used in trucks and off-road vehicles. The latter consists of two sections of housing connected by flanges, which does not require disassembling the wheels during maintenance and is more suitable for passenger cars. The latter is mostly made of high-strength cast steel or welded steel plates and must have the characteristics of impact resistance and fatigue resistance. Its performance is directly related to the driving safety and transmission efficiency of the vehicle.

[0003] However, traditional bridge shell structural components have many product specifications and a wide range of dimensions, including length, width, and height. Currently, the production of bridge shells faces prominent issues in terms of flipping and separating the handling of iron filings. For flipping, manual hoisting requires the use of cranes, and the lifting slings are manually adjusted, resulting in high labor intensity and low efficiency. Furthermore, the contact points are prone to slippage, causing the clamping reference to shift, resulting in poor positioning accuracy and high calibration costs. In addition, the simple brackets are mostly fixed structures, requiring frequent clamp changes to adapt to different specifications of bridge shells, making it difficult to meet the needs of multiple specifications and small batches. Moreover, rigid contact can easily scratch the bridge shell, reducing the pass rate. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a bridge housing flipping device with iron filings collection function to solve the problems mentioned in the background.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bridge shell flipping device with iron filings collection function, comprising a platform frame, and a left worktable and a right worktable located at the top of the platform frame. A protective cover is provided on the upper part of the left worktable, and an electrical control box is fixedly installed on the inner side of the lower part of the left worktable. A movable clamping and rotating unit is provided on the upper part of the left worktable. A feeding chute is opened in the middle of the top of the right worktable, and an iron filings collection cart is provided at the bottom of the right worktable below the feeding chute. A [further details about the device are missing]. A bridge housing V-shaped support blocks are symmetrically installed on both sides of the feeding trough. Supporting balls are fixedly installed in the recessed part of the top of the bridge housing V-shaped support blocks. A bridge housing body is arranged between the two bridge housing V-shaped support blocks and the movable clamping rotating unit. Air blowing components are also symmetrically installed on both sides of the feeding trough above the right worktable. A bracket one and a bracket two are fixedly installed on the upper part of the right worktable away from the left worktable. A detection switch transmitter is fixedly installed on the outer side of the top of the bracket one, and a detection switch receiver is fixedly installed on the outer side of the top of the bracket two.

[0006] Preferably, the movable clamping and rotating unit includes a main support and a secondary support. A three-jaw chuck body is provided on the side of the main support facing the bridge housing body, and jaws are provided on the outer side of the three-jaw chuck body. A geared motor is fixedly installed on the side of the main support away from the three-jaw chuck body. A connecting plate is fixedly installed in the middle of the lower part of the main support. Guide rails are provided on both sides of the connecting plate at the lower part of the main support. The secondary support is fixedly installed at the bottom of the left worktable. A push rod cylinder is fixedly installed on the side of the secondary support facing the connecting plate. A connector is provided between the push rod cylinder and the connecting plate. A limiter is also fixedly installed at the top of the left worktable. A scale is fixedly installed on the top of the main support facing the three-jaw chuck body. A pointer is fixedly installed on the outer diameter surface of the three-jaw chuck body.

[0007] Preferably, the output end of the geared motor is connected to the three-jaw chuck body via a transmission connection. The three chucks are provided with three identical jaws, which are distributed at a 120° angle. The two guide rails are provided with two identical guide rails, which are symmetrically distributed at the bottom end of the main support. The connecting plate passes through the left worktable and extends to the upper side of the left worktable. The connecting plate is slidably connected to the left worktable. The push rod cylinder is located on the central axis of the main support. The two pointers are provided with two identical pointers, which are symmetrically distributed on the vertical axis of the three-jaw chuck body.

[0008] Through the above technical solution, the jaws evenly distributed at a 120° angle can provide uniform and stable clamping force for bridge housings of different diameters, avoiding the clamping deviation problem during traditional manual hoisting. Two symmetrically distributed guide rails provide precise guidance for the main support. The push rod cylinder drives the connecting plate through the connector to move the main support along the guide rail. The sliding process is smooth and without jamming. With the limiting effect of the limiter, the pushing distance of the bridge housing can be precisely controlled. Through the design of the three-jaw chuck body, scale and pointer, the flip angle of the bridge housing can be accurately viewed, ensuring the consistency of each flipping action and avoiding the angle deviation during manual flipping.

[0009] Preferably, the number of the support balls is twice that of the V-shaped support blocks of the axle housing, the support balls are symmetrically distributed on the inner side of the V-shaped support blocks of the axle housing, and the support balls are in contact with the axle housing body.

[0010] Through the above technical solution, the recessed structure of the V-shaped support block of the axle housing itself is adaptable to axle housings of different diameters. The support balls symmetrically distributed on the inner side of the V-shaped support block of the axle housing can support the axle housing body, and at the same time significantly reduce the contact resistance of the axle housing body during sliding and flipping. It solves the problem of scratches and bumps on the surface of the axle housing caused by traditional rigid support. The number of support balls is twice that of the V-shaped support block of the axle housing and they are symmetrically arranged to ensure that the axle housing body is subjected to balanced force during the support process and avoid deformation or displacement of the axle housing body caused by unilateral force.

[0011] Preferably, the detection switch transmitter and the detection switch receiver are located on opposite sides of the bridge housing body, and the detection switch transmitter and the detection switch receiver are on the same horizontal line.

[0012] With the above technical solution, when the handling robot places the bridge shell body on the bridge shell V-shaped support block, if the bridge shell is not in place or is misplaced, it will block the normal transmission of the detection signal. Only when the bridge shell body is completely in the support range of the bridge shell V-shaped support block and the posture is horizontal can the detection signal be smoothly transmitted, thereby triggering the material signal, and thus realizing subsequent clamping and flipping.

[0013] Preferably, the basin opening of the bridge housing body is located above the feed chute and the scrap collection cart. The scrap collection cart is a rolling collection cart with an open top and is connected to the feed chute.

[0014] With the above technical solution, after the bridge housing body is rotated 180°, the basin opening is directly above the material discharge chute. The iron filings and cutting fluid remaining inside can fall directly into the material discharge chute under the action of gravity, and then flow into the iron filings collection cart through the guiding effect of the material discharge chute, realizing the initial collection of waste. After the bridge housing is rotated into place, the air blowing component above the right worktable can use high-pressure airflow to specifically blow away the stubborn iron filings and cutting fluid attached to the inside and surface of the basin opening, making up for the deficiencies of gravity cleaning, realizing thorough cleaning, thereby reducing the cleaning burden of subsequent processes, and avoiding the impact of iron filings residue on the subsequent machining accuracy of the bridge housing, thus reducing the defect rate.

[0015] Preferably, the top edges of both the left and right worktables are surrounded by partitions.

[0016] The above technical solution can effectively block the cutting fluid and scattered iron filings splashed during the overturning and slag removal process of the bridge housing body 9, preventing them from splashing onto the outside of the workbench and damaging surrounding equipment and polluting the working environment. At the same time, it can prevent iron filings from splashing and causing safety hazards to operators, thus improving the safety of equipment use.

[0017] Compared with the prior art, this utility model provides a bridge housing flipping device with iron filings collection function, which has the following beneficial effects: 1. This bridge shell flipping device with iron filings collection function can clamp bridge shells of different diameters through 120° angled claws, avoiding the deviation problem of manual hoisting. The dual guide rails and push rod cylinders, together with the limiter, can accurately control the pushing distance of the bridge shell. The combination of scale and pointer can ensure that the flipping angle is accurate and consistent, solving the angle deviation problem of manual operation. The V-shaped support block is compatible with bridge shells of different specifications. The symmetrically distributed support balls not only achieve balanced support, but also greatly reduce the contact resistance when the bridge shell slides and flips, avoiding surface scratches and deformation caused by rigid support. 2. This bridge housing flipping device with iron filings collection function allows the bridge housing to be flipped 180° so that the basin opening faces the feeding chute. Iron filings and cutting fluid can be drawn into the rolling collection cart by gravity through the feeding chute. Combined with the high-pressure airflow of the blowing component, it can thoroughly remove stubborn residues, reduce the burden of subsequent cleaning and improve processing accuracy. At the same time, when combined with the transfer robot, it can improve the production efficiency of bridge housings and avoid the problems of long hoisting time and low loading and unloading accuracy caused by the need for manual handling in the existing technology. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the bridge housing body installation structure of this utility model; Figure 3 This is a schematic diagram of the air blowing assembly installation structure of this utility model; Figure 4This is a schematic diagram of the installation structure of the mobile clamping and rotating unit of this utility model; Figure 5 This is a schematic diagram of the installation structure of the detection switch receiver of this utility model; Figure 6 This is a schematic diagram of the installation structure of the detection switch transmitter of this utility model; Figure 7 This is a schematic diagram of the installation structure of the material feeding trough of this utility model; Figure 8 This is a schematic diagram of a half-section of the material feeding trough of this utility model; Figure 9 This is a schematic diagram of the three-dimensional structure of the movable clamping and rotating unit of this utility model. Figure 1 ; Figure 10 This is a schematic diagram of the three-dimensional structure of the movable clamping and rotating unit of this utility model. Figure 2 .

[0019] The components include: 1. Platform frame; 2. Left worktable; 3. Protective cover; 4. Right worktable; 5. Electrical control box; 6. Scrap collection cart; 7. Mobile clamping and rotating unit; 701. Main support; 702. Sub-support; 703. Push rod cylinder; 704. Connector; 705. Connecting plate; 706. Guide rail; 707. Limiter; 708. Gear motor; 709. Three-jaw chuck body; 710. Jaw; 711. Scale; 712. Pointer; 8. Bridge housing V-shaped support block; 9. Bridge housing body; 10. Support ball; 11. Air blowing assembly; 12. Support one; 13. Detection switch transmitter; 14. Support two; 15. Detection switch receiver; 16. Discharge chute. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1: like Figure 1-10As shown, the present invention provides a bridge housing tilting device with iron filings collection function, including a platform frame 1, and a left workbench 2 and a right workbench 4 located at the top of the platform frame 1. A protective cover 3 is provided on the upper part of the left workbench 2, and an electrical control box 5 is fixedly installed on the inner side of the lower part of the left workbench 2. A movable clamping and rotating unit 7 is provided on the upper part of the left workbench 2. A feeding trough 16 is opened in the middle of the top of the right workbench 4. An iron filings collection cart 6 is provided at the bottom of the right workbench 4 below the feeding trough 16. Above the right workbench 4, on both sides of the feeding trough 16, are iron filings collection carts. The bridge housing is equipped with V-shaped support blocks 8. Supporting balls 10 are fixedly installed in the recess at the top of the bridge housing V-shaped support blocks 8. A bridge housing body 9 is provided between the two bridge housing V-shaped support blocks 8 and the movable clamping rotating unit 7. Air blowing components 11 are also symmetrically installed on both sides of the feed chute 16 above the right worktable 4. A bracket 12 and a bracket 2 14 are fixedly installed at the upper part of the right worktable 4 away from the left worktable 2. A detection switch transmitter 13 is fixedly installed on the outer side of the top of the bracket 12, and a detection switch receiver 15 is fixedly installed on the outer side of the top of the bracket 2 14.

[0022] Example 2: like Figure 2-10 As shown, as an improvement to the previous embodiment, in order to clamp, push and flip the bridge housing body 9.

[0023] Specifically, the movable clamping and rotating unit 7 includes a main support 701 and a secondary support 702. A three-jaw chuck body 709 is mounted on the side of the main support 701 facing the bridge housing body 9, with jaws 710 on the outer side of the three-jaw chuck body 709. A reduction motor 708 is fixedly mounted on the side of the main support 701 away from the three-jaw chuck body 709. A connecting plate 705 is fixedly mounted in the middle of the lower part of the main support 701. Guide rails 706 are located on both sides of the connecting plate 705 at the lower part of the main support 701. The secondary support 702 is fixedly mounted at the bottom of the left worktable 2. A push rod cylinder 703 is fixedly mounted on the side of the secondary support 702 facing the connecting plate 705. A connector 704 is provided between the push rod cylinder 703 and the connecting plate 705. A limiter 707 is also fixedly mounted on the top of the left worktable 2. A scale 711 is fixedly installed on the top of the main support 701 facing the three-jaw chuck body 709. A pointer 712 is fixedly installed on the outer diameter surface of the three-jaw chuck body 709. The output end of the reduction motor 708 is connected to the three-jaw chuck body 709 for transmission. Three identical jaws 710 are provided, and the three jaws 710 are distributed at a 120° angle. Two identical guide rails 706 are provided, and the two guide rails 706 are symmetrically distributed at the bottom of the main support 701. The connecting plate 705 passes through the left worktable 2 and extends to the upper side of the left worktable 2. The connecting plate 705 is slidably connected to the left worktable 2. The push rod cylinder 703 is located on the central axis of the main support 701. Two identical pointers 712 are provided, and the two pointers 712 are symmetrically distributed on the vertical axis of the three-jaw chuck body 709. The advantages are that the jaws 710, evenly distributed at a 120° angle, can clamp bridge housing bodies 9 of different diameters with uniform and stable force, avoiding the clamping deviation problem during traditional manual hoisting. Two symmetrically distributed guide rails 706 provide precise guidance for the main support 701. The push rod cylinder 703 drives the connecting plate 705 through the connector 704 to move the main support 701 along the guide rails 706. The sliding process is smooth and without jamming. With the limiting effect of the limiter 707, the pushing distance of the bridge housing body 9 can be precisely controlled. Through the design of the three-jaw chuck body 709, scale 711 and pointer 712, the flip angle of the bridge housing body 9 can be accurately viewed, ensuring the consistency of each flipping action and avoiding angle deviation during manual flipping.

[0024] Example 3: like Figure 2-10 As shown, as an improvement to the previous embodiment, support and testing are performed.

[0025] Specifically, the number of support balls 10 is twice that of the V-shaped support block 8 of the axle housing. The support balls 10 are symmetrically distributed on the inner side of the V-shaped support block 8 of the axle housing, and the support balls 10 are in contact with the axle housing body 9. The advantage is that the concave structure of the V-shaped support block 8 of the axle housing itself is adaptable to axle housings of different diameters. The support balls 10 symmetrically distributed on the inner side of the V-shaped support block 8 of the axle housing can support the axle housing body 9, and at the same time, it greatly reduces the contact resistance of the axle housing body 9 during sliding and flipping. It solves the problem of scratches and bumps on the axle housing surface caused by traditional rigid support. The number of support balls 10 is twice that of the V-shaped support block 8 of the axle housing and they are symmetrically arranged to ensure that the axle housing body 9 is subjected to balanced force during the support process, and avoids deformation or displacement of the axle housing body 9 caused by unilateral force.

[0026] Specifically, the detection switch transmitter 13 and the detection switch receiver 15 are located on opposite sides of the bridge housing body 9, and are on the same horizontal line. The advantage is that when the handling robot places the bridge housing body 9 on the bridge housing V-shaped support block 8, if the bridge housing is not in place or is misaligned, it will block the normal transmission of the detection signal. Only when the bridge housing body 9 is completely within the support range of the bridge housing V-shaped support block 8 and is horizontal can the detection signal be smoothly transmitted, thereby triggering a material presence signal, and thus enabling subsequent clamping and flipping.

[0027] Example 4: like Figure 2-10 As shown, as an improvement to the previous embodiment, in order to remove stubborn iron filings and cutting fluid from inside the bridge housing body 9.

[0028] Specifically, the basin opening of the bridge housing body 9 is located above the feed chute 16 and the chip collection cart 6. The chip collection cart 6 is a rolling collection cart with an open top structure, and it is interconnected with the feed chute 16. The advantage is that after the bridge housing body 9 is rotated 180°, the basin opening is directly above the feed chute 16. Residual chips and cutting fluid inside can fall directly into the feed chute 16 under gravity, and then flow into the chip collection cart 6 through the guide effect of the feed chute 16, achieving initial collection of waste. The air blowing assembly 11 above the right worktable 4, after the bridge housing is rotated into position, can use high-pressure airflow to specifically blow away stubborn chips and cutting fluid adhering to the inside and surface of the basin opening, compensating for the shortcomings of gravity cleaning, achieving thorough cleaning, and thus reducing the cleaning burden of subsequent processes. At the same time, it avoids the impact of chip residue on the subsequent machining accuracy of the bridge housing, reducing the defect rate.

[0029] Specifically, the top edges of both the left worktable 2 and the right worktable 4 are equipped with surrounding panels. The advantage is that these panels effectively block the cutting fluid and scattered metal chips that splash during the rotation and cleaning of the bridge housing 9, preventing them from splashing onto the outside of the worktable and damaging surrounding equipment or polluting the working environment. They also prevent metal chip splashes from posing a safety hazard to operators, thus improving the safety of equipment use.

[0030] Working principle: During use, the handling robot places the bridge housing body 9 on the bridge housing V-shaped support block 8 on the right worktable 4. The support balls 10 on the inner side of the bridge housing V-shaped support block 8 provide support for the bridge housing body 9 and reduce its subsequent movement resistance. At this time, the detection switch transmitter 13 on bracket one 12 and the detection switch receiver 15 on bracket two 14 determine whether the bridge housing body 9 is placed in place and has a horizontal attitude through signal on / off. After the signal is turned on, the subsequent action is triggered. Then, the movable clamping and rotating unit 7 on the left worktable 2 is started. The push rod cylinder 703 pushes the connecting plate 705 through the connector 704, which drives the main bracket 701 to slide along the guide rail 706 towards the bridge housing body 9. The limiter 707 precisely controls the pushing distance. The three-jaw chuck jaws 710, distributed at a 120° angle on 701, provide uniform and stable clamping to the bridge housing body 9. The geared motor 708 drives the three-jaw chuck to rotate the bridge housing body 9. The operator can use the scale 711 and pointer 712 to control the precise rotation angle. When the bridge housing body 9 rotates 180°, its basin opening faces the unloading trough 16 of the right worktable 4. The residual iron filings and cutting fluid inside fall into the unloading trough 16 under the action of gravity and flow into the iron filings collection cart 6 below. At the same time, the air blowing components 11 on both sides of the unloading trough 16 spray high-pressure airflow to sweep away the stubborn iron filings and cutting fluid inside and outside the basin opening, ensuring thorough cleaning. The baffles at the top of the left worktable 2 and the right worktable 4 prevent iron filings and cutting fluid from splashing. The whole process is controlled by the electrical control box 5.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bridge shell flipping device with iron filings collection function, comprising a platform frame (1), and a left worktable (2) and a right worktable (4) located at the top of the platform frame (1), characterized in that: A protective cover (3) is provided on the upper part of the left workbench (2). An electrical control box (5) is fixedly installed on the inner side of the lower part of the left workbench (2). A movable clamping and rotating unit (7) is provided on the upper part of the left workbench (2). A feeding trough (16) is opened in the middle of the top of the right workbench (4). A scrap collection cart (6) is provided at the bottom of the right workbench (4) below the feeding trough (16). A bridge shell V-shaped support block (8) is symmetrically installed on both sides of the feeding trough (16) above the right workbench (4). The recessed part of the top of the bridge shell V-shaped support block (8) is fixed. A support ball bearing (10) is installed, and a bridge housing body (9) is provided between the two bridge housing V-shaped support blocks (8) and the movable clamping rotating unit (7). Air blowing components (11) are also symmetrically installed on both sides of the feed chute (16) above the right worktable (4). A bracket one (12) and a bracket two (14) are fixedly installed at the upper part of the right worktable (4) away from the left worktable (2). A detection switch transmitter (13) is fixedly installed on the outer side of the top of the bracket one (12), and a detection switch receiver (15) is fixedly installed on the outer side of the top of the bracket two (14).

2. The bridge shell flipping device with iron filings collection function according to claim 1, characterized in that: The movable clamping and rotating unit (7) includes a main support (701) and a secondary support (702). A three-jaw chuck body (709) is provided on the side of the main support (701) facing the bridge housing body (9). Jaws (710) are provided on the outer side of the three-jaw chuck body (709). A geared motor (708) is fixedly installed on the side of the main support (701) away from the three-jaw chuck body (709). A connecting plate (705) is fixedly installed in the middle of the lower part of the main support (701). Guide rails (710) are provided on both sides of the connecting plate (705) at the lower part of the main support (701). 06), the sub-support (702) is fixedly installed at the bottom of the left worktable (2), and a push rod cylinder (703) is fixedly installed on the side of the sub-support (702) facing the connecting plate (705). A connector (704) is provided between the push rod cylinder (703) and the connecting plate (705). A limiter (707) is also fixedly installed at the top of the left worktable (2). A scale (711) is fixedly installed on the side of the top of the main support (701) facing the three-jaw chuck body (709). A pointer (712) is fixedly installed on the outer diameter surface of the three-jaw chuck body (709).

3. The bridge shell flipping device with iron filings collection function according to claim 2, characterized in that: The output end of the geared motor (708) is connected to the three-jaw chuck body (709) for transmission. There are three identical jaws (710), which are distributed at a 120° angle. There are two identical guide rails (706), which are symmetrically distributed at the bottom of the main support (701). The connecting plate (705) passes through the left worktable (2) and extends to the upper side of the left worktable (2). The connecting plate (705) is slidably connected to the left worktable (2). The push rod cylinder (703) is located on the central axis of the main support (701). There are two identical pointers (712), which are symmetrically distributed on the vertical axis of the three-jaw chuck body (709).

4. The bridge shell flipping device with iron filings collection function according to claim 1, characterized in that: The number of the support balls (10) is twice that of the bridge housing V-shaped support block (8). The support balls (10) are symmetrically distributed on the inner side of the bridge housing V-shaped support block (8). The support balls (10) are in contact with the bridge housing body (9).

5. A bridge housing flipping device with iron filings collection function according to claim 1, characterized in that: The detection switch transmitter (13) and the detection switch receiver (15) are located on both sides of the bridge housing body (9), and the detection switch transmitter (13) and the detection switch receiver (15) are located on the same horizontal line.

6. A bridge housing flipping device with iron filings collection function according to claim 1, characterized in that: The basin opening of the bridge housing body (9) is located above the feed trough (16) and the scrap collection cart (6). The scrap collection cart (6) is a rolling collection cart. The top of the scrap collection cart (6) has an open structure. The scrap collection cart (6) is interconnected with the feed trough (16).

7. A bridge housing flipping device with iron filings collection function according to claim 1, characterized in that: The top of the left worktable (2) and the right worktable (4) are both surrounded by panels.

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