Anti-blocking concrete mixing plant unloading structure

Abstract

This invention discloses an anti-clogging concrete mixing plant unloading structure, including a mixer and a fixing block. The mixer is part of the concrete mixing plant, and a mixing mechanism is rotatably installed inside the mixer. The fixing block is fixedly installed on the inner wall of the outer connecting pipe, and a connecting shaft is rotatably installed inside the fixing block, with a connecting rod fixedly installed on the surface of the connecting shaft. It also includes a fixing plate, which is fixedly installed on the surface of the mixer, with a long plate slidably mounted on its surface, and a striking rod slidably mounted on the surface of the long plate. During operation, this anti-clogging concrete mixing plant unloading structure mixes the concrete through the mixing mechanism inside the mixer. During unloading, the electrically controlled baffle is opened, activating the electric telescopic rod. The electric telescopic rod drives the unloading plate to reciprocate linearly in the horizontal direction. When the unloading plate is in motion, unloading is faster, improving work efficiency and preventing clogging.

Description

Technical Field

[0001] This invention relates to the field of concrete mixing plant technology, specifically to an anti-clogging concrete mixing plant unloading structure. Background Technology

[0002] A concrete mixing plant is a type of concrete manufacturing equipment that can improve the quality of the produced concrete and has better safety features. It is widely used in the construction industry and also has the advantages of energy saving, high efficiency and environmental protection. The unloading structure is one of the important components of a mixing plant.

[0003] For example, a batching plant unloading device disclosed in CN217597466U includes fixed sections connected to the unloading port of the batching plant and connecting chains connecting the fixed sections and between the fixed sections and the unloading port. The fixed sections include rigid fixed sections and flexible fixed sections. The unloading port is connected to the upper port of the rigid fixed section, and the upper port of the flexible fixed section is connected to the lower port of the rigid fixed section. The connecting chains are evenly distributed on the unloading port or the fixed sections. As can be seen from the above description, the batching plant unloading device provided by this utility model includes fixed sections and connecting chains. By connecting fixed sections and unloading ports of different sizes, the device enables efficient and rapid concrete loading for different types of transport equipment, thus improving work efficiency.

[0004] For example, a concrete mixing plant unloading device disclosed in CN206780680U includes a hopper and a cylinder. The cylinder is supported by a support column, and the hopper and cylinder are detachably connected. The device also includes a slide rail for vertical sliding of the hopper, with a locking element on the slide rail. When the hopper is connected to the cylinder, the locking element prevents the hopper from detaching from the cylinder. The hopper is equipped with a drive component to provide power for its sliding. When the hopper needs maintenance, a motor drives a gear to rotate on the rack of the slide rail, lowering the hopper from a higher position to a lower position on the ground. This facilitates maintenance personnel in repairing the hopper and reduces the danger of their work.

[0005] After the concrete is mixed, it needs to be unloaded. During the unloading process, a large amount of material may cause blockage in the equipment. The equipment in the above application does not have an anti-blockage function. When there is a large amount of material, the equipment will be blocked, which will affect the unloading process and the construction progress, causing unnecessary trouble for the construction work.

[0006] To address the aforementioned issues, there is an urgent need for innovative design based on the existing unloading structure of concrete mixing plants. Summary of the Invention

[0007] The purpose of this invention is to provide an anti-clogging unloading structure for a concrete mixing plant, in order to solve the problem mentioned in the background art that the device does not have an anti-clogging function during use, and when there is a lot of material, the device will become clogged, which will affect the unloading process of the device and the construction progress, causing unnecessary trouble for the construction work.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a non-clogging concrete mixing plant unloading structure, comprising a mixer and a fixing block, wherein the mixer is part of the concrete mixing plant, and the mixer is equipped with a mixing mechanism for rotation inside, and an external pipe is fixedly installed on the lower surface of the mixer, and a connecting plate is fixedly installed on the lower surface of the mixer.

[0009] The fixing block is fixedly installed on the inner wall of the outer pipe, and a connecting shaft is rotatably provided inside the fixing block, and a connecting rod is fixedly installed on the surface of the connecting shaft;

[0010] A clog-resistant unloading structure for a concrete mixing plant further includes:

[0011] An electrically controlled baffle is movably disposed inside the outer pipe, and a unclogging rod is movably disposed inside the outer pipe;

[0012] An electric telescopic rod is fixedly installed on the surface of the docking plate, and a feeding plate is fixedly installed at the output end of the electric telescopic rod, and a side plate is fixedly installed on the side of the feeding plate.

[0013] A fixing plate is fixedly installed on the surface of the mixer, and a long plate is slidably provided on the surface of the fixing plate, and a striking rod is slidably provided on the surface of the long plate.

[0014] Preferably, the electrically controlled baffle is electrically connected to the external control device. The side plates are symmetrically distributed about the center of the feeding plate, and the feeding plate is inclined. A traction rope is fixedly installed on the surface of the feeding plate. During operation, the concrete is mixed by the mixing mechanism inside the mixer. When feeding, the electrically controlled baffle is opened, and the electric telescopic rod is also activated. The electric telescopic rod drives the feeding plate to reciprocate linearly in the horizontal direction. When the feeding plate is in a moving state, the feeding is faster, improving work efficiency and avoiding blockage of the device.

[0015] Preferably, the other side of the traction rope is wound and fixedly connected to the surface of the connecting shaft, the connecting rods are symmetrically distributed about the center of the connecting shaft, and a limit rod is fixedly installed on the inner wall of the outer tube. When the feeding plate moves away from the outer tube, the feeding plate drives the connecting shaft to rotate through the traction rope. When the connecting shaft rotates, it drives the connecting rods to rotate synchronously.

[0016] Preferably, a movable plate is sleeved on the surface of the limiting rod, and the unblocking rod is fixedly installed on the upper surface of the movable plate. A first magnet is fixedly installed on the lower surface of the movable plate and the upper surface of the connecting rod. When the connecting rod rotates, it drives its own first magnet to rotate synchronously.

[0017] Preferably, the magnetic poles of two adjacent first magnets are the same, and the unblocking rods are evenly distributed on the upper surface of the movable plate. When the first magnet on the upper surface of the connecting rod approaches the first magnet on the lower surface of the movable plate, the movable plate rises under the action of mutual repulsive magnetic force, while the limiting rod makes the movable plate move only in the vertical direction. When the first magnet on the upper surface of the connecting rod moves away from the first magnet on the lower surface of the movable plate, the movable plate descends under its own gravity. Repeating the above process, the movable plate makes reciprocating linear motion in the vertical direction, thereby driving the unblocking rods to move synchronously. When the unblocking rods move in the vertical direction, they play a role in unblocking and facilitating material discharge.

[0018] Preferably, the movable plate is equipped with ball bearings for rotation, and the surface of the ball bearings is in contact with the surface of the limiting rod. When the movable plate moves, the ball bearings make the movable plate move more smoothly and improve work efficiency.

[0019] Preferably, limit blocks are fixedly installed on both the left and right sides of the connecting shaft, and a torsion spring with elastic reset function is fixedly installed on the surface of the limit block. The other side of the torsion spring is fixedly connected to the inner wall of the fixed block. When the connecting shaft rotates, the torsion spring is stretched by the limit block. When the feed plate moves towards the outer pipe, the connecting shaft loses the tension of the traction rope. At this time, the connecting shaft rotates under the action of the limit block and the torsion spring. When the connecting shaft rotates, the movable plate and the unblocking rod will also make reciprocating linear motion in the vertical direction. At the same time, when the connecting shaft rotates, the traction rope will be wound up for the next use.

[0020] Preferably, a long pin is fixedly installed on the upper surface of the feeding plate, and the long pin is distributed at an angle. An overlapping block is fixedly installed on the surface of the long plate, and a second magnet is fixedly installed at the end of the overlapping block and the end of the long pin. The magnetic poles of adjacent positions of the second magnets are the same.

[0021] Preferably, a crossbar is fixedly installed on the surface of the fixed plate, and the crossbar passes through the interior of the long plate. A connecting spring that plays an elastic restoring role is fixedly installed on the surface of the long plate, and the other side of the connecting spring is fixedly connected to the outer wall of the mixer.

[0022] Preferably, the connecting spring is initially in a stretched state, the striking rods are evenly distributed on the surface of the long plate, and a ball bearing is rotatably disposed inside the long plate, with the surface of the ball bearing in contact with the surface of the crossbar. Initially, the long plate is in a stretched state under the action of the repulsive magnetic force of the second magnets. However, as the cutting plate moves the long pin, the second magnet at the end of the long pin moves away from the second magnet at the end of the overlapping block. At this time, the repulsive magnetic force of the second magnets on the overlapping block and the long plate decreases. Then, under the action of the connecting spring and the crossbar, the long plate moves horizontally... The plate moves towards the mixer in the direction of vertical movement. When the second magnet at the end of the long pin approaches the second magnet at the end of the overlapping block, the repulsive magnetic force between the overlapping block and the long plate increases. At this time, under the action of the repulsive magnetic force, the long plate moves away from the mixer in the horizontal direction. Repeating the above process, the long plate drives the striking rod to make reciprocating linear motion in the horizontal direction. The striking rod will hit the outer shell of the mixer repeatedly, thus putting the mixer in a state of vibration, making the material feeding faster and further optimizing the anti-clogging effect. The rolling ball makes the long plate move more smoothly.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: The unloading structure of the anti-clogging concrete mixing plant adopts a novel structural design, the specific details of which are as follows:

[0024] (1) The unloading structure of the anti-blocking concrete mixing plant, when working, completes the mixing of concrete through the mixing mechanism inside the mixer. When discharging, the electric control baffle is opened, and the electric telescopic rod is also started. The electric telescopic rod drives the discharge plate to make reciprocating linear motion in the horizontal direction. When the discharge plate is in the moving state, the discharge is faster, which improves the working efficiency and avoids the blockage of the device.

[0025] (2) When the unloading structure of the anti-blocking concrete mixing plant is reciprocating linearly in the horizontal direction, the connecting shaft rotates reciprocally inside the fixed block under the action of the traction rope, the limiting block and the torsion spring. Then, the movable plate and the unblocking rod reciprocate linearly in the vertical direction under the action of the mutual repulsion magnetic force of the first magnet, its own weight and the limiting rod. When the unblocking rod moves in the vertical direction, it plays the role of unblocking, which facilitates unloading. The ball makes the movable plate move more smoothly and improves the work efficiency.

[0026] (3) When the discharge plate of the anti-clogging concrete mixing plant moves in a reciprocating linear motion, the discharge plate drives the long pin to move synchronously. At this time, under the action of the repulsive magnetic force of the second magnet, the connecting spring and the crossbar, the long plate drives the striking rod to move in a reciprocating linear motion in the horizontal direction. The striking rod will hit the outer shell of the mixer repeatedly, and the mixer will be in a state of vibration, which makes the discharge faster and further optimizes the anti-clogging effect. The rolling ball makes the long plate move more smoothly. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the connection structure between the mixer and the fixing plate of the present invention;

[0028] Figure 2 This is a schematic diagram of the right cross-sectional structure of the mixer of the present invention;

[0029] Figure 3 This is a schematic diagram of the connection structure between the docking plate and the electric telescopic rod of the present invention;

[0030] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0031] Figure 5 This is a partial side sectional view of the unblocking rod of the present invention in its working state;

[0032] Figure 6 This is a schematic diagram of the connection structure between the mixer and the fixing plate of the present invention;

[0033] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B;

[0034] Figure 8 This is a partial side sectional view of the working state of the striking rod of the present invention.

[0035] In the diagram: 1. Mixer; 2. Mixing mechanism; 3. External pipe; 4. Electrically controlled baffle; 5. Connecting plate; 6. Electric telescopic rod; 7. Discharge plate; 8. Side plate; 9. Fixing block; 10. Connecting shaft; 11. Traction rope; 12. Torsion spring; 13. Connecting rod; 14. Limiting rod; 15. Movable plate; 16. Ball bearing; 17. Unblocking rod; 18. First magnet; 19. Long pin; 20. Fixing plate; 21. Long plate; 22. Crossbar; 23. Overlapping block; 24. Second magnet; 25. Striking rod; 26. Connecting spring; 27. Ball bearing; 28. Limiting block. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1-8The present invention provides a technical solution: a non-clogging concrete mixing plant unloading structure, including a mixer 1 and a fixing block 9. The mixer 1 is part of the concrete mixing plant, and a mixing mechanism 2 is rotatably arranged inside the mixer 1. An outer pipe 3 is fixedly installed on the lower surface of the mixer 1, and a docking plate 5 is fixedly installed on the lower surface of the mixer 1. The fixing block 9 is fixedly installed on the inner wall of the outer pipe 3, and a connecting shaft 10 is rotatably arranged inside the fixing block 9. A connecting rod 13 is fixedly installed on the surface of the connecting shaft 10.

[0038] A clog-resistant unloading structure for a concrete mixing plant further includes:

[0039] An electric control baffle 4 is movably installed inside the outer pipe 3, and a dredging rod 17 is movably installed inside the outer pipe 3. An electric telescopic rod 6 is fixedly installed on the surface of the docking plate 5, and a feeding plate 7 is fixedly installed at the output end of the electric telescopic rod 6. A side plate 8 is fixedly installed on the side of the feeding plate 7.

[0040] During operation, the mixing mechanism 2 inside the mixer 1 completes the mixing of concrete. When discharging, the electric control baffle 4 is opened, and the electric telescopic rod 6 on the surface of the docking plate 5 is also activated. The electric telescopic rod 6 drives the discharging plate 7 to make reciprocating linear motion in the horizontal direction. When the discharging plate 7 is in the moving state, the discharging is faster, which improves the work efficiency and avoids the device from getting blocked.

[0041] A fixed plate 20 is fixedly installed on the surface of the mixer 1, and a long plate 21 is slidably provided on the surface of the fixed plate 20. A striking rod 25 is slidably provided on the surface of the long plate 21. The electric control baffle 4 is electrically connected to an external control device. The side plates 8 are symmetrically distributed about the center of the feeding plate 7, and the feeding plate 7 is inclined. A traction rope 11 is fixedly installed on the surface of the feeding plate 7.

[0042] The other side of the traction rope 11 is wound and fixedly connected to the surface of the connecting shaft 10. The connecting rods 13 are symmetrically distributed about the center of the connecting shaft 10. The inner wall of the outer pipe 3 is fixedly installed with a limiting rod 14. The surface of the limiting rod 14 is sleeved and connected with a movable plate 15. The upper surface of the movable plate 15 is fixedly installed with a dredging rod 17. The lower surface of the movable plate 15 and the upper surface of the connecting rod 13 are both fixedly installed with a first magnet 18.

[0043] The magnetic poles of two adjacent first magnets 18 are the same. The unblocking rods 17 are evenly distributed on the upper surface of the movable plate 15. The movable plate 15 is rotatably equipped with balls 16, and the surface of the balls 16 is in contact with the surface of the limiting rod 14.

[0044] Limiting blocks 28 are fixedly installed on both the left and right sides of the connecting shaft 10, and a torsion spring 12 that plays an elastic reset role is fixedly installed on the surface of the limiting block 28, and the other side of the torsion spring 12 is fixedly connected to the inner wall of the fixing block 9.

[0045] As the feeding plate 7 moves away from the outer pipe 3, the feeding plate 7 drives the connecting shaft 10 to rotate inside the fixed block 9 via the traction rope 11 (at this time, the connecting shaft 10 stretches the torsion spring 12 through the limiting block 28). When the connecting shaft 10 rotates, it drives the connecting rod 13 to rotate synchronously. When the connecting rod 13 rotates, it drives its own first magnet 18 to rotate synchronously. When the first magnet 18 on the upper surface of the connecting rod 13 approaches the first magnet 18 on the lower surface of the movable plate 15, the movable plate 15 rises under the action of mutual repulsive magnetic force. The limiting rod 14 causes the movable plate 15 to move only in the vertical direction. As the connecting rod 13 continues to rotate, when the first magnet 18 on the upper surface of the connecting rod 13 moves away from the first magnet 18 on the lower surface of the movable plate 15, the movable plate 15 moves in its own direction. As the material descends under its own weight, the above process is repeated. The movable plate 15 reciprocates in a straight line in the vertical direction, which in turn drives the unblocking rod 17 to move synchronously. When the unblocking rod 17 moves in the vertical direction, it plays a role in unblocking and facilitating material feeding. The ball bearing 16 makes the movable plate 15 move more smoothly and improves work efficiency. When the feeding plate 7 moves towards the outer pipe 3, the connecting shaft 10 loses the tension of the traction rope 11. At this time, the connecting shaft 10 rotates under the action of the limit block 28 and the torsion spring 12. When the connecting shaft 10 rotates, the movable plate 15 and the unblocking rod 17 will also reciprocate in a straight line in the vertical direction to unblock again. At the same time, when the connecting shaft 10 rotates, it will rewind the traction rope 11 for the next use.

[0046] Long pins 19 are fixedly installed on the upper surface of the feed plate 7, and the long pins 19 are distributed in an inclined manner. Overlapping blocks 23 are fixedly installed on the surface of the long plate 21, and second magnets 24 are fixedly installed at the ends of the overlapping blocks 23 and the ends of the long pins 19, and the magnetic poles of adjacent positions of the second magnets 24 are the same.

[0047] A crossbar 22 is fixedly installed on the surface of the fixed plate 20, and the crossbar 22 passes through the interior of the long plate 21. A connecting spring 26 that plays an elastic reset role is fixedly installed on the surface of the long plate 21, and the other side of the connecting spring 26 is fixedly connected to the outer wall of the mixer 1.

[0048] The connecting spring 26 is initially in a stretched state. The striking rods 25 are evenly distributed on the surface of the long plate 21, and the long plate 21 is rotatably equipped with a ball 27, and the surface of the ball 27 is in contact with the surface of the crossbar 22.

[0049] Initially, the long plate 21 is in a state of tensioned connecting spring 26 under the action of the repulsive magnetic force of the second magnet 24. As the feeding plate 7 moves the long pin 19, the second magnet 24 at the end of the long pin 19 moves away from the second magnet 24 at the end of the overlapping block 23. At this time, the repulsive magnetic force of the second magnet 24 on the overlapping block 23 and the long plate 21 decreases. Then, under the action of the connecting spring 26 and the crossbar 22, the long plate 21 moves horizontally towards the mixer 1, while the second magnet 24 at the end of the long pin 19 moves closer to the overlapping block. When the second magnet 24 at the end of 23 is activated, the repulsive magnetic force between the overlapping block 23 and the long plate 21 increases. At this time, under the action of the repulsive magnetic force, the long plate 21 moves away from the mixer 1 in the horizontal direction. Repeating the above process, the long plate 21 drives the striking rod 25 to make reciprocating linear motion in the horizontal direction. As a result, the striking rod 25 will hit the outer shell of the mixer 1 repeatedly, and the mixer 1 will be in a state of vibration, making the material feeding faster and further optimizing the anti-clogging effect. The rolling ball 27 makes the long plate 21 move more smoothly.

[0050] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0051] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-clogging concrete mixing plant unloading structure, comprising a mixer (1) and a fixing block (9), wherein the mixer (1) is part of the concrete mixing plant, and the mixer (1) is provided with a mixing mechanism (2) rotating inside, and an external pipe (3) is fixedly installed on the lower surface of the mixer (1), and a connecting plate (5) is fixedly installed on the lower surface of the mixer (1). The fixing block (9) is fixedly installed on the inner wall of the outer pipe (3), and the fixing block (9) is rotatably provided with a connecting shaft (10), and a connecting rod (13) is fixedly installed on the surface of the connecting shaft (10). Its features are, Also includes: An electronically controlled baffle (4) is movably disposed inside the outer pipe (3), and a dredging rod (17) is movably disposed inside the outer pipe (3). An electric telescopic rod (6) is fixedly installed on the surface of the docking plate (5), and a feeding plate (7) is fixedly installed at the output end of the electric telescopic rod (6), and a side plate (8) is fixedly installed on the side of the feeding plate (7). A fixing plate (20) is fixedly installed on the surface of the mixer (1), and a long plate (21) is slidably provided on the surface of the fixing plate (20), and a striking rod (25) is slidably provided on the surface of the long plate (21). The electronically controlled baffle (4) is connected to the external control device by an electrical signal. The side plate (8) is symmetrically distributed about the center of the feed plate (7), and the feed plate (7) is distributed in an inclined manner. A traction rope (11) is fixedly installed on the surface of the feed plate (7). The other side of the traction rope (11) is wound and fixedly connected to the surface of the connecting shaft (10), the connecting rods (13) are symmetrically distributed about the center of the connecting shaft (10), and the limit rod (14) is fixedly installed on the inner wall of the outer tube (3). The surface of the limiting rod (14) is sleeved with a movable plate (15), and the upper surface of the movable plate (15) is fixedly installed with the unblocking rod (17), and the lower surface of the movable plate (15) and the upper surface of the connecting rod (13) are both fixedly installed with a first magnet (18). The magnetic poles of two adjacent first magnets (18) are the same, and the unblocking rods (17) are evenly distributed on the upper surface of the movable plate (15).

2. The anti-clogging concrete mixing plant unloading structure according to claim 1, characterized in that: The movable plate (15) is equipped with a ball bearing (16) that rotates inside, and the surface of the ball bearing (16) is in contact with the surface of the limiting rod (14).

3. The anti-clogging concrete mixing plant unloading structure according to claim 1, characterized in that: Limiting blocks (28) are fixedly installed on both the left and right sides of the connecting shaft (10), and a torsion spring (12) that plays an elastic reset role is fixedly installed on the surface of the limiting block (28), and the other side of the torsion spring (12) is fixedly connected to the inner wall of the fixing block (9).

4. The anti-clogging concrete mixing plant unloading structure according to claim 1, characterized in that: The upper surface of the feed plate (7) is fixedly installed with long pins (19), and the long pins (19) are distributed in an inclined manner. The surface of the long plate (21) is fixedly installed with overlapping blocks (23), and the ends of the overlapping blocks (23) and the ends of the long pins (19) are both fixedly installed with second magnets (24), and the magnetic poles of adjacent positions of the adjacent second magnets (24) are the same.

5. The anti-clogging concrete mixing plant unloading structure according to claim 1, characterized in that: A crossbar (22) is fixedly installed on the surface of the fixed plate (20), and the crossbar (22) passes through the interior of the long plate (21). A connecting spring (26) that plays an elastic reset role is fixedly installed on the surface of the long plate (21), and the other side of the connecting spring (26) is fixedly connected to the outer wall of the mixer (1).

6. The anti-clogging concrete mixing plant unloading structure according to claim 5, characterized in that: The connecting spring (26) is initially in a stretched state. The striking rods (25) are evenly distributed on the surface of the long plate (21). The long plate (21) is rotatably equipped with a ball (27), and the surface of the ball (27) is in contact with the surface of the crossbar (22).

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