Holding device

Abstract

The embodiment of the utility model provides a holding device. The holding device comprises a plate-shaped base, a left air cylinder, a right air cylinder, a left caliper and a right caliper, wherein the left air cylinder and the right air cylinder are respectively hinged on the base; the lower ends of the left caliper and the right caliper are respectively hinged with the base; when the left side calipers and the right side calipers swing to the limiting positions of the inner sides, the minimum gap between the left side calipers and the right side calipers is smaller than the overall dimension of an object to be clamped; the piston rod end of the left cylinder is connected with the left caliper, and the piston rod end of the right cylinder is connected with the right caliper. According to the technical scheme, the holding device is small and simple in structure, reliable in action, capable of effectively reducing the load of the air cylinder and very suitable for being applied to an automobile production assembly line.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile production, in particular to a clamping device. Background Art

[0002] In occasions such as automobile assembly lines, equipment such as material transfer machines are often needed to transfer materials (such as automobile body components) on a conveyor belt to other conveyor belts. During the transfer process, in addition to using the supporting mechanism configured on the material transfer machine to support the weight of the material, a clamping mechanism is also provided on the material transfer machine to clamp the material firmly, play an auxiliary fixing role, and prevent the material from accidentally falling off.

[0003] In the process of implementing the present utility model, the inventors found that there are at least the following problems in the prior art:

[0004] In the existing clamping mechanism, the actuator of the clamping action (which can be called a caliper) is relatively arranged left and right (or up and down). Driven by the cylinders configured respectively, the two calipers move linearly relative to each other to clamp the material located between the two calipers. In this way, since the two cylinders are arranged in a straight line in the axial direction, the size in this direction is large, which limits the use range of the material conveyor. Therefore, how to optimize the clamping mechanism to make it small in size and simple in structure, and more suitable for application in the material conveyor, is a problem that needs to be solved. Utility Model Content

[0005] The embodiment of the utility model provides a clamping device to solve the problem of limited use of the clamping device in the prior art due to its large size.

[0006] To achieve the above-mentioned purpose, an embodiment of the utility model provides a clamping device, including: a plate-shaped base, a left cylinder and a right cylinder respectively hinged on the base, and a left caliper and a right caliper respectively hinged to the base at the rear ends; when the left caliper and the right caliper are both swung to the inner limit position, the minimum gap between the left caliper and the right caliper is smaller than the outer dimension of the material to be clamped; the piston rod end of the left cylinder is connected to the left caliper, and the piston rod end of the right cylinder is connected to the right caliper.

[0007] Furthermore, when the left caliper and the right caliper are both swung to the inner limit position, the inner side surface of the left caliper and the inner side surface of the right caliper are parallel to each other.

[0008] Furthermore, the cylinder head of the left cylinder is hinged to the base, and the cylinder head of the right cylinder is hinged to the base.

[0009] Furthermore, a first boss is fixedly connected to the top inner side surface of the left caliper, and a second boss is fixedly connected to the top inner side surface of the right caliper.

[0010] Furthermore, a first connecting rod assembly is provided between the piston rod end of the left cylinder and the left caliper; the first connecting rod assembly includes a first connecting rod and a second connecting rod, the second connecting rod includes a cross rod and a longitudinal rod vertically connected to the lower part of the outer end of the cross rod; the outer end of the first connecting rod is connected to the base through a first hinge shaft, the inner end of the cross rod is connected to the middle part of the left caliper through a second hinge shaft, the outer end of the cross rod is connected to the inner end of the first connecting rod through a third hinge shaft, and the piston rod end of the left cylinder is hinged to the bottom end of the longitudinal rod; the left cylinder is located to the left rear of the left caliper; when the left caliper swings to the inner limit position, the connecting line of the first hinge shaft, the second hinge shaft, and the third hinge shaft is a straight line, and the connecting line is perpendicular to the left caliper.

[0011] Furthermore, the swing range of the left caliper is 50° to 70°.

[0012] Furthermore, a limit block is fixedly connected to the base; when the left caliper swings to the inner limit position, the third hinge shaft abuts against the rear of the limit block.

[0013] Furthermore, the length of the right caliper is shorter than that of the left caliper; when the left caliper swings to the inner limit position, the first boss and the second boss are at the same height.

[0014] Furthermore, a flange is fixedly connected to the outer side of the right caliper, the piston rod end of the right cylinder is hinged to the flange, and the hinged end of the cylinder body of the right cylinder is located below the flange.

[0015] Furthermore, a second connecting rod structure is provided between the piston rod end of the right cylinder and the right caliper; the second connecting rod structure is a left-right mirror image of the first connecting rod structure.

[0016] The above technical solution has the following beneficial effects:

[0017] This technical solution optimizes the structure of the clamping device, converting the caliper used to clamp the material from a relative linear motion form to a rocker form, so that the cylinder configured for each caliper can be set on the side of the caliper instead of being arranged in a straight line as in the prior art, thereby greatly reducing the size and making it easier to use on material conveyors.

[0018] In addition, in the present technical solution, a connecting rod mechanism is added to the cylinder and the caliper. When the material is clamped, the connecting rod mechanism is in a dead point position, which can ensure that the material will not accidentally loosen, and the reaction force of the material on the caliper directly acts on the connecting rod mechanism, thereby greatly reducing the force on the cylinder and effectively improving the service life of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a structural schematic diagram of a first embodiment of a clamping device according to an embodiment of the utility model;

[0021] Figure 2 It is a schematic diagram of the first embodiment of the utility model when the caliper is opened (at the outer limit position);

[0022] Figure 3 It is a schematic diagram of the first embodiment of the utility model when the caliper is clamped (at the inner limit position);

[0023] Figure 4 A schematic structural diagram of a second embodiment of a clamping device according to an embodiment of the utility model;

[0024] Figure numbers: 1. base; 2. left caliper; 3. right caliper; 4. left cylinder; 5. right cylinder; 6. first connecting rod; 7. cross bar; 8. longitudinal bar; 9. first boss; 10. second boss; 11. first articulated axis; 12. second articulated axis; 13. third articulated axis; 14. flange; 15. limit block; 16. first connecting block; 17. second connecting block. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1 As shown, an embodiment of the utility model provides a clamping device, comprising: a plate-shaped base 1, a left cylinder 4 and a right cylinder 5 respectively hinged on the base 1, and a left caliper 2 and a right caliper 3 respectively hinged to the base 1 at the rear ends; when the left caliper 2 and the right caliper 3 are both swung to the inner limit position, the minimum gap between the left caliper 2 and the right caliper 3 is smaller than the outer dimensions of the material to be clamped; the piston rod end of the left cylinder 4 is connected to the left caliper 2, and the piston rod end of the right cylinder 5 is connected to the right caliper 3.

[0027] In order to solve the above problems, the structure of the clamping device is optimized in the technical solution, and the caliper (including the left caliper 2 and the right caliper 3) used to clamp the material is converted from the form of linear relative motion to the form of a swing rod, that is, the left caliper 2 and the right caliper 3 can both rotate with the hinge shaft at the rear end as the axis. When the left caliper 2 and the right caliper 3 are opened, a swing rod is formed. Figure 2 The state shown in the figure facilitates the material to be clamped to enter between the two clamps; when the left clamp 2 and the right clamp 3 are pushed by their respective cylinders, they rotate inward to Figure 3 When the inner limit position is shown (i.e., the left caliper 2 is rotated to the right to the maximum angle, and the right caliper 3 is rotated to the left to the maximum angle), the gap between the left caliper 2 and the right caliper 3 is the smallest, and the gap is slightly smaller than the size of the clamped part of the material to be clamped, thereby ensuring the clamping effect.

[0028] In this design, since the left caliper 2 and the right caliper 3 rotate instead of moving linearly, the left cylinder 4 and the right cylinder 5 do not need to be arranged horizontally on the left and right sides of the two calipers, and can be like Figure 2 , Figure 3 or Figure 4 It can be arranged inclined or vertically as shown, so that the lateral size can be greatly reduced.

[0029] In specific applications, the caliper and the cylinder can be directly hinged on the base 1, and in order to avoid interference with the plate surface of the base 1 during operation, the caliper and the cylinder can be directly hinged on the base 1. Figure 1 As shown, the caliper and the cylinder are connected to the base 1 through the first connecting block 16 and the second connecting block 17, so as to ensure that there is enough clearance between the caliper and the bottom of the cylinder, as well as the remaining connecting pins, and the base 1.

[0030] Furthermore, when the left caliper 2 and the right caliper 3 are both swung to the inner limit position, the inner side surface of the left caliper 2 (i.e., its right side surface) and the inner side surface of the right caliper 3 (i.e., its left side surface) are parallel to each other.

[0031] In order to achieve a better clamping effect, it is preferred to design the left caliper 2 and the right caliper 3 when clamping the material as follows: Figure 3 The state shown is that both are vertically straightened and parallel to each other when they are located at the inner limit position, and a preset gap is left between them.

[0032] Furthermore, the cylinder head of the left cylinder 4 (ie, one end close to the piston rod) is hinged to the base 1 , and the cylinder head of the right cylinder 5 is hinged to the base 1 .

[0033] In the present application, each cylinder needs to rotate a certain angle when it is actuated. Therefore, each cylinder is provided with a hinge point between the cylinder and the base 1. When the hinge point is set at the head of the cylinder body, it can ensure that the force is more stable during the rotation process. If the hinge point is set at the tail of the cylinder body, it may have an adverse effect on the cylinder body or the piston rod, resulting in premature damage.

[0034] Furthermore, a first boss 9 is fixedly connected to the inner side surface of the top of the left caliper 2, and a second boss 10 is fixedly connected to the inner side surface of the top of the right caliper 3. These two bosses (or jaws) protrude from the inner side surfaces of the respective calipers, and can be used as contact surfaces with the material, which facilitates processing and ensures better flatness, thereby ensuring a better clamping effect.

[0035] Furthermore, a first connecting rod assembly is also arranged between the piston rod end of the left cylinder 4 and the left caliper 2; the first connecting rod assembly includes a first connecting rod 6 and a second connecting rod, the second connecting rod includes a cross rod 7 and a longitudinal rod 8 vertically connected to the lower part of the outer end of the cross rod 7; the outer end of the first connecting rod 6 is connected to the base 1 through a first hinge shaft 11, the inner end of the cross rod 7 is connected to the middle part of the left caliper 2 through a second hinge shaft 12, the outer end of the cross rod 7 is connected to the inner end of the first connecting rod 6 through a third hinge shaft 13, and the piston rod end of the left cylinder 4 is hinged to the bottom end of the longitudinal rod 8; the left cylinder 4 is located at the left rear of the left caliper 2; when the left caliper 2 swings to the inner limit position, the connecting line of the first hinge shaft 11, the second hinge shaft 12, and the third hinge shaft 13 is a straight line, and the connecting line is perpendicular to the left caliper 2.

[0036] After clamping the material, the material will also generate a reaction force on the caliper. When the material conveyor is working, the material conveyor usually needs to push the material to move horizontally. At this time, the caliper on one side needs to generate a certain thrust to the material. At this time, if the cylinder is used to directly support the caliper, a large load will be generated on the piston rod end of the cylinder, thereby reducing the service life of the cylinder. For this reason, Figure 2 , Figure 3 As shown, this technical solution has also been improved in design, and a connecting rod mechanism is added between the cylinder and the caliper on the side of the caliper that is subjected to greater force. Figure 3As shown, taking the case where the left caliper is subjected to a greater force as an example (i.e., the first embodiment), when clamping the material, the first connecting rod 6 in the connecting rod mechanism and the cross bar 7 of the second connecting rod form a straight line (i.e., the first hinge axis 11, the second hinge axis 12, and the third hinge axis 13 are connected to a straight line), and the plate surface of the left caliper 2 is perpendicular to the straight line, so that the connecting rod mechanism is in a dead point position at this time, no matter how large the reaction force to the left side is on the left caliper 2, the reaction force will not directly act on the left cylinder 4, but the first connecting rod 6 and the cross bar 7 bear the reaction force, and the left cylinder 4 is only used to keep the first connecting rod 6 and the cross bar 7 stable. As long as the strength of the first connecting rod 6 and the cross bar 7 is large enough, the left caliper 2 will not be accidentally opened, so it can be ensured that the material will not be accidentally loosened, and because the force on the left cylinder 4 is greatly reduced, the service life of the left cylinder 4 can be effectively improved.

[0037] When the material needs to be loosened, the piston rod of the left cylinder 4 contracts, and only a small force is required from the left cylinder 4 to drive the first connecting rod 6 to rotate clockwise and the second connecting rod to rotate counterclockwise, so that the connecting rod mechanism passes the dead point and no longer maintains the previous balanced state, and moves to Figure 2 The on state is shown.

[0038] Furthermore, it has been verified through experiments that when the swing range of the left caliper 2 is 50° to 70°, preferably 58° to 60°, the device can achieve better implementation effects.

[0039] Furthermore, a limit block 15 is fixedly connected to the base 1; when the left caliper 2 swings to the inner limit position, the third hinge shaft 13 abuts against the rear of the limit block 15. The function of the limit block 15 is to prevent the first connecting rod 6 and the second connecting rod from transitionally moving upward and directly passing the dead point position during the clamping operation, so that the first connecting rod 6 and the cross bar 7 cannot form a straight line, thereby making the above-mentioned design invalid.

[0040] Furthermore, the length of the right caliper 3 is shorter than that of the left caliper 2 ; when the left caliper 2 swings to the inner limit position, the first boss 9 and the second boss 10 are at the same height.

[0041] In the first embodiment, it is assumed that the left caliper 2 generates thrust on the material and the right caliper 3 only plays a role of clamping. Therefore, the right caliper 3 is subjected to less force and plays an auxiliary role. Therefore, it does not need to be designed symmetrically with the left caliper 2. In order to further reduce the size, the length of the right caliper 3 can be shortened, such as Figure 1 As shown, the second connecting block 17 is configured as a right triangle structure, the right caliper 3 is hinged to the upper corner point on the right side of the second connecting block 17 , and the longer left caliper 2 is hinged to the lower corner point on the left side of the second connecting block 17 .

[0042] Furthermore, a flange 14 is fixedly connected to the outer side of the right caliper 3 , the piston rod end of the right cylinder 5 is hinged to the flange 14 , and the hinged end of the cylinder body of the right cylinder 5 is located below the flange 14 .

[0043] When the force on the right caliper 3 is small, the right cylinder 5 does not need to be arranged at a large inclination angle like the left cylinder 4, but can be arranged as Figure 3 As shown, when the two caliper jaws are tightened, the right cylinder 5 is kept vertically arranged to further reduce the lateral dimension in the left-right direction.

[0044] Further, in another embodiment, Figure 4 As shown, a second connecting rod structure is also provided between the piston rod end of the right cylinder 5 and the right caliper 3; the second connecting rod structure is a left-right mirror image of the first connecting rod structure. This embodiment is suitable for the case where both calipers are subjected to a large force, or the two calipers are subjected to a large force in an alternating manner. At this time, the left and right sides are symmetrically arranged, and the form of the second connecting rod structure is exactly the same as the first connecting rod structure, and the two are only in a mirror image relationship with each other. Similarly, a limit block 15 needs to be provided above the second connecting rod structure.

[0045] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than those clearly stated in each claim. On the contrary, as reflected in the attached claims, the utility model is in a state with less than all the features of the disclosed individual embodiments. Therefore, the attached claims are hereby expressly incorporated into the detailed description, with each claim acting alone as a separate preferred embodiment of the utility model.

[0046] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in the present application.

[0047] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A holding device, characterized in that: include: A plate-shaped base (1), a left cylinder (4) and a right cylinder (5) respectively hinged on the base (1), and a left caliper (2) and a right caliper (3) respectively hinged to the base (1) at the rear ends; when the left caliper (2) and the right caliper (3) are both swung to the inner limit position, the minimum gap between the left caliper (2) and the right caliper (3) is smaller than the outer dimensions of the material to be clamped; the piston rod end of the left cylinder (4) is connected to the left caliper (2), and the piston rod end of the right cylinder (5) is connected to the right caliper (3).

2. The holding device according to claim 1, characterized in that: When the left caliper (2) and the right caliper (3) are both swung to the inner limit position, the inner side surface of the left caliper (2) and the inner side surface of the right caliper (3) are parallel to each other.

3. The holding device according to claim 1, characterized in that: The cylinder head of the left cylinder (4) is hinged to the base (1), and the cylinder head of the right cylinder (5) is hinged to the base (1).

4. The holding device according to claim 3, characterized in that: A first boss (9) is fixedly connected to the inner side surface of the top of the left caliper (2), and a second boss (10) is fixedly connected to the inner side surface of the top of the right caliper (3).

5. The holding device according to claim 4, characterized in that: A first connecting rod assembly is also provided between the piston rod end of the left cylinder (4) and the left caliper (2); the first connecting rod assembly comprises a first connecting rod (6) and a second connecting rod, the second connecting rod comprising a cross rod (7) and a longitudinal rod (8) vertically connected to the lower side of the outer end of the cross rod (7); the outer end of the first connecting rod (6) is connected to the base (1) via a first hinge shaft (11), the inner end of the cross rod (7) is connected to the middle part of the left caliper (2) via a second hinge shaft (12), and the The outer end of the cross bar (7) is connected to the inner end of the first connecting rod (6) through a third hinge shaft (13), and the piston rod end of the left cylinder (4) is hinged to the bottom end of the longitudinal rod (8); the left cylinder (4) is located at the left rear of the left caliper (2); when the left caliper (2) swings to the inner limit position, the connecting line of the first hinge shaft (11), the second hinge shaft (12), and the third hinge shaft (13) is a straight line, and the connecting line is perpendicular to the left caliper (2).

6. The holding device according to claim 5, characterized in that: The swing range of the left caliper (2) is 50° to 70°.

7. The holding device according to claim 5, characterized in that: A limit block (15) is fixedly connected to the base (1); when the left caliper (2) swings to the inner limit position, the third hinge shaft (13) abuts against the rear of the limit block (15).

8. The holding device according to claim 7, characterized in that: The length of the right caliper (3) is shorter than that of the left caliper (2); when the left caliper (2) swings to the inner limit position, the first boss (9) and the second boss (10) are at the same height.

9. The holding device according to claim 8, characterized in that: A flange (14) is fixedly connected to the outer side of the right caliper (3), the piston rod end of the right cylinder (5) is hinged to the flange (14), and the hinged end of the cylinder body of the right cylinder (5) is located below the flange (14).

10. The holding device according to claim 7, characterized in that: A second connecting rod structure is also provided between the piston rod end of the right cylinder (5) and the right caliper (3); the second connecting rod structure is a left-right mirror image of the first connecting rod structure.

Images