A tire gripping device for a tire changer

Abstract

This utility model discloses a tire clamping device for a tire changer. The device includes a clamping disc, with gripper components on top, gripper connecting frames and piston drive components below. It also includes connectors fixedly connected to the clamping disc and three piston drive components on its top and side surfaces, respectively. Three sliding grooves extending radially from the outer edge to the center point are evenly distributed on the clamping disc. The three gripper components are radially movably mounted on the sliding grooves and pass through them, respectively fixedly connected to the gripper connecting frames below the clamping disc. Each piston drive component drives the gripper component to move along the sliding groove through the connected gripper connecting frame. This device can prevent tire slippage, thus preventing machine damage and personal injury accidents, and has a simple and reliable structure.

Description

Technical Field

[0001] This utility model relates to the field of automotive maintenance equipment technology, and in particular to a disc tire clamping device for a tire changer. Background Technology

[0002] Tire changers typically use disc-type tire clamping devices to hold tires for tire removal and installation. The reliability and stability of the disc-type tire clamping device are crucial for ensuring efficient and safe tire removal and installation. The tire clamping device of a tire changer consists of a large clamping disc with multiple grippers. A pneumatic device drives the grippers to clamp the tire. This type of tire changer is widely used due to its ease of operation.

[0003] Traditional tire changers typically use a disc-type tire clamping device with two sets of four grippers on the clamping disc. This paired, symmetrical gripper arrangement is generally considered the optimal tire clamping method. However, due to the spatial symmetry limitations of the clamping device, one of the four grippers is usually driven directly by two drive cylinders. This directly driven gripper then drives the other three grippers through a linkage mechanism. This structure affects the balance and stability of the clamping force of the four grippers. The directly driven gripper has a stronger clamping force, while the clamping force of the other three indirectly driven grippers is weaker and less balanced compared to the directly driven gripper. This can easily lead to the so-called "rim jump" problem, where the rim jumps out from one or more grippers, requiring the tire to be re-clamped. In severe cases, this can cause machine or personal injury accidents.

[0004] Another problem with the above-mentioned two-cylinder, four-claw layout is that the drive unit occupies a large space, and the drive medium pipelines connecting the cylinders are all exposed to the outside. As a result, there are relatively many pipelines, which are messy and occupy a large space, making the clamping parts larger. This will affect the compactness of the clamping parts and may also easily cause damage to the pneumatic pipelines when operating the tire changer.

[0005] In addition, the gripper components are mostly modular structures, and the contact surface or clamping surface with the tire is generally flat. They have many parts and the clamping effect on the tire is poor. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a tire clamping device for a tire changer that can achieve balanced force on the tire, stable clamping, and a compact structure.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a tire clamping device for a tire changer, comprising: a clamping plate, a clamping claw component disposed on the upper part of the clamping plate, a clamping claw connecting frame and a piston driving component disposed below the clamping plate, and a connector fixedly connected to the clamping plate and the three piston driving components on the top and side surfaces respectively. Three sliding grooves extending radially from the outer edge to the center point are evenly distributed on the clamping plate. The three clamping claw components are respectively radially movably disposed on the sliding grooves and pass through the sliding grooves and are fixedly connected to the clamping claw connecting frames below the three clamping plates. Each piston driving component drives the clamping claw component to move along the sliding groove through the clamping claw connecting frame connected to it.

[0008] In a preferred embodiment of the tire clamping device of this utility model, the clamping disk is triangular star-shaped, and the included angles between each pair of the symmetrical center lines extending outward from the center point of the three star corners of the triangle are equal, and the sliding groove extends from the outer edge along the symmetrical center line towards the center point.

[0009] In a preferred embodiment of the tire clamping device of this utility model, the piston drive component is disposed below the star-shaped portion, and the cylinder end and plunger end of the piston drive component are respectively connected to the connector and the gripper connecting frame.

[0010] In a preferred embodiment of the tire clamping device of this utility model, the connector is a hexahedral structure of an approximately equilateral triangle formed by three evenly distributed drive component mounting surfaces and three truncated surfaces arranged alternately with the drive component mounting surfaces. The connector has a shaft hole at its center. The drive component mounting surfaces are connected to the piston drive component. The truncated surfaces are the input and output connection parts of the drive medium.

[0011] In a preferred embodiment of the tire clamping device of this utility model, the connector is an inner channel connector, a first driving medium inlet / outlet hole is provided on one of the truncated facets of the connector, three first inner channels are provided inside the connector, the first inner channels are connected to the first driving medium inlet / outlet holes, and the first inner channels are connected after the piston driving component is connected to the driving component mounting surface; a second driving medium inlet / outlet hole and a third driving medium inlet / outlet hole are provided on one of the truncated facets of the connector, and a second inner channel is provided inside the connector connecting the second driving medium inlet / outlet hole and the third driving medium inlet / outlet hole.

[0012] In a preferred embodiment of the tire clamping device of this utility model, the upper part of the connector is a necked structure, and it also includes a balance limiting ring and a balance limiting rod. The balance limiting ring is rotatably mounted on the necked structure, and there are three balance limiting rods. The two ends of each balance limiting rod are rotatably connected to the balance limiting ring and the gripper connecting frame, respectively.

[0013] In a preferred embodiment of the tire clamping device of this utility model, the clamping claw component is an integrally formed multi-arc surface clamping claw, including a hull that can move in the sliding groove, a clamping claw body is provided on the upper part of the hull, and the hull is provided with a spacer block that is fixed to the clamping claw connecting frame.

[0014] In a preferred embodiment of the tire clamping device of this utility model, the clamping claw body includes an inner clamping part facing the center of the clamping disc and an outer supporting surface facing outward. The inner clamping part includes an inner tooth surface with locking teeth and a supporting transition surface. The outer supporting surface includes an outer tooth surface with locking teeth and an upper inclined surface. The inner tooth surface is a concave arc surface. The surface of the transition surface is a concave spherical crown-shaped surface. The outer tooth surface is a convex arc surface.

[0015] Compared with the prior art, the present invention provides the following advantages for tire changing and mounting machines: three gripper components are provided on the clamping disc, and a piston drive component is fixedly connected to the bottom of the clamping disc via a connector. The piston drive component directly drives the three gripper components to move in the sliding groove and clamp the tire through the gripper connecting frame. Since the three gripper components directly obtain a balanced and stable driving force from their respective connected piston drive components, the force applied to the clamping points of the three clamping points on the rim is equal, which can avoid the occurrence of "rim skipping" and can prevent machine damage and personal injury accidents. Moreover, the structure is simple and reliable. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0017] Figure 1 This is a perspective view of the tire clamping device structure according to one embodiment of the present invention. Figure 2 Is with Figure 1 Perspective diagrams of tire clamping devices in different directions; Figure 3 yes Figure 1 A schematic diagram of a tire clamping device exploding; Figure 4 is a schematic diagram of the clamping structure of the large disk; Figure 5 This is a perspective diagram of the connector structure; Figure 6 yes Figure 5 A schematic diagram of the connector projected along section AA; Figure 7 yes Figure 5 A schematic diagram of the connector projected along the BB section; Figure 8 is a schematic diagram of the assembly of the piston drive component and the connector; Figure 9 is a schematic diagram of the cylinder block of the piston drive component; Figure 10 This is a schematic diagram of the motion-related component structure; Figure 11 This is a schematic diagram of the structure of some motion-related components; Figure 12 This is a perspective view of the assembly of the gripper components and the connecting frame; Figure 13 This is a perspective view of the gripper component structure; Figure 14 This is a perspective diagram of the connecting frame structure; Figure 15 This is a perspective view of the structure of the drive medium distribution valve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] Please see Figure 1-4As shown, this utility model embodiment provides a preferred tire clamping device for a tire changer. The clamping disc 1 of this device is triangular star-shaped, with three star-shaped corners 11 extending outward from the center point 10 along the symmetrical center line 13. The included angles between any two symmetrical center lines 13 are equal. The star-shaped corners 11 are connected by arcs and have equal widths. Three sliding grooves 12 extend from the outer edge of each star-shaped corner 11 towards the center point 10 along the symmetrical center line 13. Three gripper components 2 are provided on the clamping disc 1, and a gripper connecting frame 6 and a piston drive component 3 are provided below it. The piston drive component 3 can be a pneumatic valve. One piston drive component 3 is provided below each of the three star-shaped corners 11. The piston drive component 3 is installed below the star-shaped corners 11, so that a large space is formed between the edge of the star-shaped corner 11 and the large arcs 14 of the two star-shaped corners for the tire removal roller to operate, making the tire removal operation smoother. The bottom surface of the clamping disc 1 is fixedly connected to the top surface of the connector 4. The three driving component mounting surfaces 42 on the three sides of the connector 4 are respectively fixedly connected to the three piston driving components 3. The three gripper components 2 are respectively radially movably arranged on the sliding groove 12 and pass through the sliding groove 12 to be fixedly connected to the gripper connecting frame 6 under the three clamping discs 1. The cylinder end 31 and plunger end 32 of each piston driving component 3 are respectively connected to the connector 4 and the gripper connecting frame 6. The gripper component 2 is driven to move along the sliding groove 12 by the gripper connecting frame 6 connected to the plunger end 32. Clamping the rim with three grippers is equivalent to defining a circle with three points. The clamping force on the rim or the force on each gripper itself is relatively balanced, which can stably clamp inward or support the rim of the tire to be removed or installed. A more preferred embodiment is to provide a rotatable balance limiting device between the clamping disc 1 and the connector 4. The balance limiting device includes a balance limiting ring 5 and balance limiting rods 51. The balance limiting ring 5 is rotatably mounted on the necking structure 49. Preferably, the balance limiting ring 5 is circular, and more preferably, it is triangular. There are three balance limiting rods 51. The two ends of each balance limiting rod 51 are rotatably connected to the balance limiting ring 5 and the gripper connecting frame 6, respectively. This can prevent the gripper clamping force from becoming unstable due to unstable cylinder pressure.

[0020] Please see Figure 5-7As shown, in this embodiment, the connector 4 has a hexahedral structure, consisting of three evenly distributed drive component mounting surfaces 42 and three truncated surfaces 43 arranged alternately with the drive component mounting surfaces 42. Its radial cross-section is approximately the shape formed by removing three corners from an equilateral triangle; the face with the three corners removed is the truncated surface 43. The upper part of the connector 4 is a necked structure 49, and the upper surface of the necked structure 49 is fixedly connected to the clamping disc 1. The drive component mounting surfaces 42 and the truncated surfaces 43 are spaced apart to form a hexahedral structure on the side surfaces. The connector 4 has a central shaft hole 41. Each drive component mounting surface 42 has a mounting protrusion 420 for mounting the piston drive component 3. The mounting protrusion 420 has a sealing groove 421 on its outside. The cylinder end 31 of the piston drive component 3 is fitted onto the mounting protrusion 420 of the drive component mounting surface 42 and sealed by a rubber sealing ring provided in the sealing groove 421. The piston drive component 3 is fixed to the mounting screw hole 422 on the drive component mounting surface 42 of the connector 4 using bolts 314.

[0021] In this embodiment, the truncated facet 43 is provided with an inlet / outlet for introducing or exporting driving gas to the connector 4. The connector 4 is an internal channel connector. A first driving medium inlet / outlet hole 44 is provided on one of the truncated facets 43 of the connector 4. An air inlet elbow 441 is installed at the first driving medium inlet / outlet hole 44. A first internal channel 45 is provided inside the connector 4. One of the first internal channels 45 is connected to the first driving medium inlet / outlet hole 44. After the three piston driving components 3 are connected to the driving component mounting surface 42, the three first internal channels 45 are interconnected through a through groove 423. The entering driving gas can push the piston to move away from the connector 4. A second driving medium inlet / outlet hole 46 and a third driving medium inlet / outlet hole 47 are provided on one of the truncated facets 43 of the connector 4. A first tee 461 is installed at the second driving medium inlet / outlet hole 46, and a second tee 471 is installed at the third driving medium inlet / outlet hole 47. A second internal channel 48 is provided inside the connector 4 to connect the second driving medium inlet / outlet hole 46 and the third driving medium inlet / outlet hole 47.

[0022] The clamping disc adopts a symmetrical triangular star structure along the symmetrical center line 13, and the connector adopts a similarly symmetrical truncated equilateral triangle structure. The triangular star structure of the clamping disc and the truncated equilateral triangle structure of the connector overlap during installation, resulting in good dynamic balance when the tire clamping device rotates at high speeds. The connector's internal channel design allows most of the externally required drive gas lines to be replaced by internal channels, optimizing the spatial layout and making the clamping device compact and small in size, thus avoiding mechanical damage caused by cluttered pipelines.

[0023] Please see Figure 8-10As shown, in this embodiment, each piston drive component has a cylinder elbow 313 at its front end. A drive medium distribution valve 7 connected to the connector 4 is disposed below it. The drive medium distribution valve 7 includes a valve body 71 that rotates synchronously with the connector 4, a first distribution port 72 communicating with the first drive medium inlet / outlet port 44, a second distribution port 73 communicating with the second drive medium inlet / outlet port 46, and two air inlets 74 and 75 connected to the foot pedal (not shown). The first distribution port 72 is connected to the air inlet elbow 441 of the first drive medium inlet / outlet port 44, allowing the incoming drive gas to push the piston away from the connector 4. The second distribution port 73 is connected to one port on the outside of the first tee 461 of the second drive medium inlet / outlet port 46. The other port on the outside of the first tee 461 and the two ports on the outside of the second tee 471 of the third drive medium inlet / outlet port 47 are respectively connected to the cylinder elbows 313 at the front ends of the three piston drive components, allowing the incoming drive gas to push the piston towards the connector 4.

[0024] Please see Figure 11-15 As shown, in this embodiment, the gripper component 2 is a one-piece multi-arc gripper. This one-piece design reduces manufacturing costs and maintenance expenses by using fewer components. The gripper component 2 includes a hull 25 that can move within the sliding groove 12. A gripper body 20 is disposed on the upper part of the hull 25. The hull 25 is provided with a spacer block 253 fixed to the gripper connecting frame 6. The bottom of the spacer block 253 is provided with a first fixing hole 254 and a second fixing hole 255, which are respectively fixed to the first fixing post 66 and the second fixing post 67 of the fixing plate 61 of the gripper connecting frame 6. The gap formed between the hull 25 and the fixing plate 61 allows the gripper component 2 and the gripper connecting frame 6 to move along the sliding groove 12 on both sides of the gripping plate. One end of the balance limiting rod 51 is rotatably connected to the fixed plate 61 via a threaded fastener 63. The other ends of the three balance limiting rods 51 are rotatably connected to the balance limiting ring 5. The balance limiting ring 5 can rotate on the necking structure 49. Because the gripper connecting frame 6 interacts with the balance limiting rods 51 and the balance limiting ring 5, it can limit the movement of any gripper component from causing uneven clamping force. The plunger end 32 is connected to the pin hole 65 of the connecting plate 62 of the gripper connecting frame 6 via a pin 64.

[0025] In this embodiment, the gripper body 20 includes an inner gripping portion facing the center of the gripping disc and an outer supporting surface facing outward. The inner gripping portion of the gripper body 20 clamps the outer surface of the rim. The inner gripping portion includes an inner tooth surface 23 with locking teeth and a supporting transition surface 231. The rim is clamped by the locking teeth of the inner tooth surface 23, which is a concave arc surface. The surface of the transition surface 231 is a concave spherical crown-shaped surface. The outer supporting surface includes an outer tooth surface 21 with locking teeth and an upper inclined surface 211. The locking teeth of the outer tooth surface 21 contact and support the rim. The outer tooth surface 21 is a convex arc surface. At least one spacer plane 200 is provided in the middle of the inner tooth surface 23 and the middle of the outer tooth surface 21, respectively. The clamping effect of the tooth surface divided by the spacer plane is better. The hull 25 includes an outer inclined surface 251 and an inner inclined surface 252, both of which are curved surfaces that bulge towards the center in the vertical direction.

[0026] Using a rounded tooth surface can better fit the wheel rim and improve the clamping effect. Using an inwardly concave spherical transition surface can make the contact angle between the edge of the wheel rim and the clamping body smaller. Using a curved surface on the inclined surface of the hull can reduce the frictional resistance between the tire and the clamping body during clamping.

[0027] 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 tire clamping device for a tire changer, comprising: A clamping disk (1) is provided with a gripper component (2) on the top, a gripper connecting frame (6) and a piston drive component (3) on the bottom. The invention is characterized by further including a connector (4) that is fixedly connected to the clamping disk (1) and the three piston drive components (3) on the top and side surfaces respectively. Three sliding grooves (12) are evenly distributed on the clamping disk (1) and extend radially from the outer edge to the center point (10). The three gripper components (2) are respectively radially movable and disposed on the sliding grooves (12) and pass through the sliding grooves (12) and are fixedly connected to the gripper connecting frame (6) below the three clamping disks (1). Each piston drive component (3) drives the gripper component (2) to move along the sliding groove (12) through the gripper connecting frame (6) connected to it.

2. The tire clamping device of the tire changer according to claim 1, characterized in that, The clamping disk (1) is triangular star-shaped. The angles between each pair of the symmetrical center lines (13) extending outward from the center point (10) of the three star corners (11) of the triangular star are equal. The sliding groove (12) extends from the outer edge along the symmetrical center line (13) towards the center point (10).

3. The tire clamping device of the tire changer according to claim 2, characterized in that, The piston drive component (3) is disposed below the star corner portion (11), and the cylinder end (31) and plunger end (32) of the piston drive component (3) are respectively connected to the connector (4) and the gripper connecting frame (6).

4. The tire clamping device of the tire changer according to claim 3, characterized in that, The connector (4) is a hexahedral structure of an approximately equilateral triangle formed by three evenly distributed drive mounting surfaces (42) and three truncated surfaces (43) that are staggered with the drive mounting surfaces (42). The connector (4) has a shaft hole (41) at its center. The drive mounting surfaces (42) are connected to the piston drive component (3). The truncated surfaces (43) are the input and output connection parts of the drive medium.

5. The tire clamping device of the tire changer according to claim 4, characterized in that, The connector (4) is an internal channel connector. A first driving medium inlet / outlet hole (44) is provided on one of the truncated surfaces (43) of the connector (4). Three first internal channels (45) are provided inside the connector (4). The first internal channels (45) are connected to one of the first driving medium inlet / outlet holes (44). After the piston drive component (3) is connected to the drive component mounting surface (42), the three first internal channels (45) are connected. A second driving medium inlet / outlet hole (46) and a third driving medium inlet / outlet hole (47) are provided on one of the truncated surfaces (43) of the connector (4). A second internal channel (48) connecting the second driving medium inlet / outlet hole (46) and the third driving medium inlet / outlet hole (47) is provided inside the connector (4).

6. The tire clamping device of the tire changer according to claim 5, characterized in that, The upper part of the connector (4) is a necked structure (49), and also includes a balance limiting ring (5) and a balance limiting rod (51). The balance limiting ring (5) is rotatably mounted on the necked structure (49). There are three balance limiting rods (51), and the two ends of each balance limiting rod (51) are rotatably connected to the balance limiting ring (5) and the gripper connecting frame (6) respectively.

7. The tire clamping device of the tire changer according to claim 6, characterized in that, The balance limiting ring (5) is circular or triangular.

8. The tire clamping device of the tire changer according to claim 7, characterized in that, The piston drive component (3) is a pneumatic valve.

9. The tire clamping device of the tire changer according to claim 8, characterized in that, It also includes a drive medium distribution valve (7) disposed below the connector (4), comprising a valve body (71), a first distribution port (72) communicating with the first drive medium inlet / outlet port (44), and a second distribution port (73) communicating with the second drive medium inlet / outlet port (46).

10. The tire clamping device of the tire changer according to claim 1, characterized in that, The gripper component (2) is an integrally formed multi-arc gripper, including a hull (25) that can move in the sliding groove (12), a gripper body (20) is provided on the upper part of the hull (25), and the hull (25) is provided with a spacer block (253) fixed to the gripper connecting frame (6).

11. The tire clamping device of the tire changer according to claim 10, characterized in that, The gripper body (20) includes an inner gripping part facing the center of the gripping disk and an outer support surface facing outward. The inner gripping part includes an inner tooth surface (23) with locking teeth and a support transition surface (231). The outer support surface includes an outer tooth surface (21) with locking teeth and an upper inclined surface (211). The inner tooth surface (23) is a concave arc surface. The surface of the transition surface (231) is a concave spherical crown surface. The outer tooth surface (21) is a convex arc surface. At least one spacer plane (200) is provided in the middle of the inner tooth surface (23) and the middle of the outer tooth surface (21).

12. The tire clamping device of the tire changer according to claim 11, characterized in that, The hull (25) includes an outer inclined surface (251) and an inner inclined surface (252), both of which are curved surfaces that bulge towards the middle in the vertical direction.

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