Positioning clamp

Abstract

A positioning clamp comprises a base plate, the base plate is used for bearing a product, a fixed limiting structure and an elastic limiting structure are arranged on the base plate, the fixed limiting structure is fixedly installed on the base plate, and the elastic limiting structure comprises a driving shaft, an elastic limiting structure and an elastic limiting structure, and the driving shaft is installed on the base plate in a sliding mode; the spring is arranged at the tail end of the driving shaft, is in a compressed state and is used for elastically connecting the driving shaft with the base plate; the connecting rod assembly is connected with the driving shaft, and a first elastic limiting piece and a second elastic limiting piece are fixedly installed on the connecting rod assembly; the driving shaft moves under the action of the restoring force of the spring, and the relative positions of the fixed limiting structure, the first elastic limiting piece and the second elastic limiting piece are changed through the connecting rod assembly, so that the fixed limiting structure, the first elastic limiting piece and the second elastic limiting piece make contact with the peripheral face of the product, and the position of the product on the base plate is limited. Therefore, accurate and flexible positioning of the product is achieved, and the product quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to tool fixture technical field especially a positioning fixture. BACKGROUND

[0002] With the improvement of automation degree, the processing or testing of products is generally realized through automatic equipment, in order to realize the automatic conveying of products, the products usually need to be loaded by using special tool fixtures, so as to ensure the accurate position and stable posture of the products in the equipment and improve the processing and testing precision.

[0003] At present, the clamping mode has the shaft hole positioning mode, the positioning mode is higher to the placing precision of the product, and the precision of the operator or automatic handling device is higher, and another positioning mode is to push the roughly positioned product from the side of the product, so that the product moves to a certain fixed position and is clamped, so that the product is positioned and fixed at the same time, but due to the precision of the action mechanism of the limiting structure cannot be kept for a long time, the product may have a gap between the product and the positioning structure after positioning or be over-tightened, which affects the product quality. UTILITY MODEL CONTENT

[0004] In view of the above-mentioned defects in the prior art, the present application provides a positioning fixture, so as to realize accurate and flexible positioning of the product and ensure the product quality.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A positioning fixture, comprising a base plate, the base plate is used for carrying a product, the base plate is provided with a fixed limiting structure and an elastic limiting structure, the fixed limiting structure is fixedly installed on the base plate, and the elastic limiting structure comprises:

[0007] A drive shaft is slidably installed on the base plate;

[0008] A spring is arranged at the tail end of the drive shaft and is in a compressed state, and is used for elastically connecting the drive shaft and the base plate;

[0009] A connecting rod assembly is connected with the drive shaft, and a first elastic limiting piece and a second elastic limiting piece are fixedly installed on the connecting rod assembly;

[0010] Under the action of the restoring force of the spring, the drive shaft moves and changes the relative position between the fixed limiting structure, the first elastic limiting piece and the second elastic limiting piece through the connecting rod assembly, so that the fixed limiting structure, the first elastic limiting piece and the second elastic limiting piece are all in contact with the outer circumferential surface of the product, and the position of the product on the base plate is limited.

[0011] As a further improvement of the above technical scheme:

[0012] The connecting rod assembly comprises:

[0013] A first connecting rod structure, one end of which is hinged to the base plate, the other end of which is hinged to the leading end of the drive shaft, and the first elastic limiting piece is fixedly installed on the middle part of the first connecting rod structure;

[0014] A second connecting rod structure, which is hingedly installed on the base plate, is drivingly connected to the middle part of the drive shaft, and the second elastic limiting piece is fixedly installed on the moving rod of the second connecting rod structure;

[0015] When the drive shaft moves under the action of the spring restoring force, the first connecting rod structure and the second connecting rod structure respectively drive the first elastic limiting piece and the second elastic limiting piece to move towards the product.

[0016] Further comprising a pair of coaxial and spaced linear bearings arranged on the base plate, the drive shaft is slidingly connected with the two linear bearings, and the second connecting rod structure is located between the two linear bearings;

[0017] The first limiting structure is arranged on one side of the leading end of the drive shaft, the drive shaft is sleeved with the spring between the linear bearing adjacent to the limiting block and the limiting block arranged on the tail end of the drive shaft.

[0018] The first connecting rod structure comprises a first arm and a second arm, one end of the first arm is hinged to the end of the drive shaft, the other end of the first arm is hinged to one end of the second arm, the other end of the second arm is hinged to the base plate, and the first elastic limiting piece is fixedly installed on the first arm;

[0019] The second connecting rod structure comprises two swing rods parallel to each other, one end of each swing rod is hinged to the base plate, the two swing rods are respectively hinged to the end of the moving rod, the two swing rods and the moving rod form a parallelogram connecting rod structure, and the second elastic limiting piece is fixedly installed on the moving rod;

[0020] The middle part of one of the swing rods is drivingly connected to the drive shaft.

[0021] The outer peripheral surface of the product is in the shape of a rectangular ring structure as a whole;

[0022] The first elastic limiting piece is in the shape of a rod, one end of the first elastic limiting piece is fixedly connected to the first arm, the other end of the first elastic limiting piece is a first contact part, and the second elastic limiting piece is provided with a second contact part;

[0023] The first contact part and the second contact part are used to contact the outer peripheral surface of the product and correspond to one set of adjacent sides of the rectangle, and the fixed limiting structure corresponds to the other set of adjacent sides of the rectangle.

[0024] The second contact portion is a plane, and the plane is parallel to the axis of the drive shaft.

[0025] Further comprising a first hole group and a second hole group, the first elastic limiting part is detachably connected with the first arm rod through the first hole group, used for adjusting the relative position of the first elastic limiting part and the first arm rod, and the second elastic limiting part is detachably connected with the moving rod through the second hole group, used for adjusting the relative position of the second elastic limiting part and the moving rod.

[0026] Further comprising a shift fork fixedly installed on the drive shaft, and the slot depth direction of the shift fork is perpendicular to the axis of the drive shaft, and further comprising a connecting shaft installed on a swing rod, and the connecting shaft is in sliding fit with the slot of the shift fork.

[0027] The fixed limiting structure comprises a first fixed limiting part and a second fixed limiting part fixedly installed on the base plate, and the first fixed limiting part and the second fixed limiting part limit the position of the product from two different directions.

[0028] Further comprising an automatic push rod mechanism, the automatic push rod mechanism comprises a linear driver fixedly connected with the base plate, and the moving end of the linear driver is provided with a push rod corresponding to the tail end of the drive shaft, used for driving the drive shaft to move.

[0029] The linear driver is a pneumatic cylinder.

[0030] The beneficial effects of the utility model are as follows:

[0031] The utility model discloses compact structure, reasonable, convenient operation, through spring, drive shaft and base plate elastic connection, through connecting rod assembly, the elastic force is transmitted to first elastic limiting part and second elastic limiting part, and product is moved and is guaranteed product and limiting structure good adhesion, realizes the accurate, flexible positioning of product, guarantees product quality.

[0032] The utility model also includes the following advantages:

[0033] (1) drive shaft is slidably installed on the base plate, the drive shaft is elastically connected with the base plate through the spring, the axial displacement of the drive shaft is converted into the displacement of first elastic limiting part and second elastic limiting part in two different directions through the first connecting rod structure and the second connecting rod structure, the restoring force of the spring is used as the driving force, and the first elastic limiting part and the second elastic limiting part are driven to move, and under the action of the elastic force of the spring, the first elastic limiting part, the second elastic limiting part, the fixed limiting structure and the outer circumferential surface of the product are contacted, accurate, flexible positioning of product is realized.

[0034] (2) for the product of the outer peripheral surface is rectangular annular structure, through the second elastic limiting piece set with the drive shaft axis parallel plane, from the product one side to the product, the first elastic limiting piece from the other side of the product to push the product, the first elastic limiting piece and the second elastic limiting piece cooperate, realize two-way synchronous adjustment, improve the adjustment efficiency, while the elastic limiting structure as a whole is half ring around the product of the outer peripheral, drive shaft and product side parallel, reduce the overall structure size of the positioning fixture.

[0035] (3) set up the automatic push rod mechanism on the base plate, as the driving force of the drive shaft movement, realize the automatic opening of the clamp, facilitate application and automation production line. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is the structural schematic diagram (product positioning before) of the utility model.

[0037] Figure 2 It is the structural schematic diagram (product positioning after) of the utility model.

[0038] Figure 3 It is the structural schematic diagram of the first connecting rod structure and the first elastic limiting piece of the utility model.

[0039] Figure 4 It is the structural schematic diagram of the second connecting rod structure and the second elastic limiting piece of the utility model.

[0040] Figure 5 It is the structural schematic diagram (including automatic push rod mechanism) of the utility model.

[0041] Among them:

[0042] 10, base plate; 11, first fixed limiting piece; 12, second fixed limiting piece; 13, first elastic limiting piece; 131, first hole group; 14, second elastic limiting piece; 141, second hole group;

[0043] 15, drive shaft; 151, first limiting structure; 152, limiting block; 153, shift fork; 154, connecting shaft;

[0044] 16, spring;

[0045] 17, second connecting rod structure; 171, swing rod; 172, moving rod;

[0046] 18, first connecting rod structure; 181, first arm rod; 182, second arm rod;

[0047] 19, linear bearing;

[0048] 2, product;

[0049] 3. Automatic push rod mechanism; 31. Linear drive; 32. Push rod. DETAILED DESCRIPTION

[0050] The specific implementation of the present application will be described below in conjunction with the drawings.

[0051] As shown in Figure 1 , Figure 2 , the positioning clamp provided by an embodiment of the present application includes a base plate 10, which is used to carry a product 2. The base plate 10 is provided with a fixed limiting structure and an elastic limiting structure. The fixed limiting structure is fixedly installed on the base plate 10. The elastic limiting structure includes a driving shaft 15, a spring 16 and a connecting rod assembly.

[0052] The driving shaft 15 is slidingly installed on the base plate 10.

[0053] The spring 16 is arranged at the tail end of the driving shaft 15 and is in a compressed state, and is used to elastically connect the driving shaft 15 and the base plate 10.

[0054] The connecting rod assembly is connected with the driving shaft 15. The connecting rod assembly is fixedly installed with a first elastic limiting piece 13 and a second elastic limiting piece 14.

[0055] Under the action of the restoring force of the spring 16, the driving shaft 15 moves and changes the relative positions among the fixed limiting structure, the first elastic limiting piece 13 and the second elastic limiting piece 14 through the connecting rod assembly, so that the fixed limiting structure, the first elastic limiting piece 13 and the second elastic limiting piece 14 are all in contact with the outer circumferential surface of the product 2, and the position of the product 2 on the base plate 10 is limited.

[0056] The driving shaft 15 is elastically connected with the base plate 10 through the spring 16. The elastic force is transmitted to the first elastic limiting piece 13 and the second elastic limiting piece 14 through the connecting rod assembly, the product 2 is pushed to move and is ensured to be well attached to the limiting structure, the accurate and flexible positioning of the product is realized, and the product quality is ensured.

[0057] In an exemplary embodiment, as shown in Figure 1 , Figure 2 , the connecting rod assembly includes:

[0058] A first connecting rod structure 18, one end of the first connecting rod structure 18 is hinged to the base plate 10, the other end of the first connecting rod structure 18 is hinged to the head end of the driving shaft 15, and the first elastic limiting piece 13 is fixedly installed on the middle part of the first connecting rod structure 18.

[0059] A second connecting rod structure 17, which is hingedly installed on the base plate 10, is drivingly connected with the middle part of the driving shaft 15, and the second elastic limiting piece 14 is fixedly installed on the moving rod 172 of the second connecting rod structure 17.

[0060] When the drive shaft 15 moves under the restoring force of the spring 16, the first link structure 18 and the second link structure 17 respectively drive the first elastic limiting member 13 and the second elastic limiting member 14 to move toward the product 2.

[0061] like Figure 1 As shown, when an external force pushes the tail end of the drive shaft 15, the spring 16 is further compressed, and the drive shaft 15 drives the first elastic limiting member 13 and the second elastic limiting member 14 away from the product 2 (or the positioning area of ​​the product 2). When the external force disappears, the drive shaft 15 moves under the restoring force of the spring 16, driving the first elastic limiting member 13 and the second elastic limiting member 14 closer to the product 2 placed on the substrate 10, so that the first elastic limiting member 13 and the second elastic limiting member 14 make elastic contact with the product 2, avoiding the impact force brought by the rigid drive structure, and making the contact force when the limiting structure contacts the product 2 more gentle.

[0062] A drive shaft 15 is slidably mounted on the substrate 10. The drive shaft 15 is elastically connected to the substrate 10 via a spring 16. The axial displacement of the drive shaft 15 is converted into two displacements in different directions by the first link structure 18 and the second link structure 17. The restoring force of the spring 16 is used as the driving force to drive the first elastic limiter 13 and the second elastic limiter 14 to move. Under the elastic force of the spring 16, the first elastic limiter 13, the second elastic limiter 14, and the fixed limiting structure come into contact with the outer peripheral surface of the product 2, thereby achieving precise and flexible positioning of the product 2.

[0063] For example, such as Figure 1 , Figure 2 As shown, it also includes a pair of coaxial linear bearings 19 spaced apart on the substrate 10, the drive shaft 15 is slidably connected to the two linear bearings 19, and the second link structure 17 is located between the two linear bearings 19.

[0064] A first limiting structure 151 is provided on one side of the first end of the drive shaft 15, and a limiting block 152 is provided at the tail end of the drive shaft 15. A spring 16 is sleeved on the drive shaft 15 between the linear bearing 19 adjacent to the limiting block 152 and the limiting block 152.

[0065] Specifically, no external force is applied to the tail end of the drive shaft 15, and under the limiting action of the first limiting structure 151, the lower spring 16 is in a compressed state, i.e., at its minimum compression degree. After the positioning of product 2 is completed, the compression degree of spring 16 is greater than the minimum compression degree of spring 16.

[0066] In one exemplary embodiment, such as Figures 1-4As shown, the first linkage structure 18 comprises a first arm 181 and a second arm 182, one end of the first arm 181 is hinged to the end of the drive shaft 15, the other end of the first arm 181 is hinged to one end of the second arm 182, the other end of the second arm 182 is hinged to the base plate 10, and the first elastic limiting piece 13 is fixedly installed on the first arm 181;

[0067] The second linkage structure 17 comprises two swing rods 171 parallel to each other, one end of each swing rod 171 is hinged to the base plate 10, and the two swing rods 171 are respectively hinged to the ends of a moving rod 172, the two swing rods 171 and the moving rod 172 form a parallelogram linkage structure, and the second elastic limiting piece 14 is fixedly installed on the moving rod 172;

[0068] The middle part of one of the swing rods 171 is in transmission connection with the drive shaft 15.

[0069] The contact part structure of the first elastic limiting piece 13 and the second elastic limiting piece 14 is matched with the shape of the product 2.

[0070] The first arm 181 and the second arm 182 form a triangular linkage structure.

[0071] In an exemplary embodiment, a pawl 153 is fixedly installed on the drive shaft 15, the slot depth direction of the pawl 153 is perpendicular to the axis of the drive shaft 15, a linkage shaft 154 is installed on one of the swing rods 171, and the linkage shaft 154 is in sliding fit with the slot of the pawl 153. When the drive shaft 15 moves, the linkage shaft 154 slides in the slot of the pawl 153, drives the swing rod 171 to swing, and changes the position of the moving rod 172.

[0072] In another exemplary embodiment, as shown in Figure 1 、 Figure 2 The outer peripheral surface of the product 2 is in overall rectangular ring structure;

[0073] The first elastic limiting piece 13 is in rod shape, one end of the first elastic limiting piece 13 is fixedly connected with the first arm 181, and the other end of the first elastic limiting piece 13 is a first contact part, and the second elastic limiting piece 14 is provided with a second contact part;

[0074] The first contact part and the second contact part are used to contact the outer peripheral surface of the product 2 and correspond to one set of adjacent sides of the rectangle, and the fixed limiting structure corresponds to another set of adjacent sides of the rectangle;

[0075] The second contact part is in plane shape, and the plane is parallel to the axis of the drive shaft 15.

[0076] The axis of the driving shaft 15, the axis of the moving rod 172 and the second contact part are parallel to each other, so that when the driving shaft 15 moves in the axial direction, the second contact part on the second elastic limiting part 14 approaches or moves away from the product 2, thereby playing a role of adjusting the product 2 from one side of the product 2.

[0077] The first contact part at the end of the first elastic limiting part 13 is in point contact or line contact with the product 2, and when the driving shaft 15 moves in the axial direction, the end of the first elastic limiting part 13 approaches or moves away from the product 2, and cooperates with the planar guiding action of the second contact part, thereby achieving bidirectional synchronous adjustment and improving the adjustment efficiency.

[0078] In addition, the first elastic limiting part 13 is detachably connected with the first arm rod 181 through the first hole group 131, which is used to adjust the relative position of the first elastic limiting part 13 and the first arm rod 181, and the second elastic limiting part 14 is detachably connected with the moving rod 172 through the second hole group 141, which is used to adjust the relative position of the second elastic limiting part 14 and the moving rod 172.

[0079] For the product 2 with a rectangular annular structure, the product 2 is adjusted from one side of the product 2 by setting a plane parallel to the axis of the driving shaft 15 on the second elastic limiting part 14, and the product 2 is pushed from the other side of the product 2 by the first elastic limiting part 13, so that the first elastic limiting part 13 and the second elastic limiting part 14 cooperate to achieve bidirectional synchronous adjustment and improve the adjustment efficiency, and at the same time, the overall elastic limiting structure is in a semicircular shape and surrounds the outer periphery of the product 2, and the driving shaft 15 is parallel to one side of the product 2, thereby reducing the overall structure size of the positioning clamp.

[0080] As shown in the figure, Figure 1 Figure 2 The fixed limiting structure includes a first fixed limiting part 11 and a second fixed limiting part 12 fixedly installed on the base plate 10, and the first fixed limiting part 11 and the second fixed limiting part 12 limit the position of the product 2 from two different directions.

[0081] The fixed limiting structure can be an integrated structure, or a combination of limiting structures in two different directions, as shown in the figure, Figure 1 The first fixed limiting part 11 is a plurality of limiting protrusions on one side of the product 2, and the second fixed limiting part 12 is a plurality of limiting protrusions on the other side of the product 2, and the first fixed limiting part 11 and the second fixed limiting part 12 are used for coarse positioning when the product 2 is placed, and are used as a positioning reference for fine positioning, and together with the elastic limiting structure, the position of the product 2 is limited.

[0082] The tail end of the driving shaft 15 driven by external force can be realized by manual operation, and in order to realize the automation of the production process, in another exemplary embodiment, as shown in the figure, Figure 5As shown, the positioning clamp provided in the application further comprises an automatic push rod mechanism 3, the automatic push rod mechanism 3 comprises a linear driver 31 fixedly connected with the base plate 10, the action end of the linear driver 31 is provided with a push rod 32, the push rod 32 corresponds to the tail end of the driving shaft 15, and is used for driving the driving shaft 15 to move.

[0083] The linear driver 31 is a gas cylinder.

[0084] The linear driver 31 is fixed in position with the base plate 10 through a support structure, which is not shown in the figure.

[0085] The gas cylinder can be a rotary clamping cylinder.

[0086] The positioning clamp of the embodiment is provided with the automatic push rod mechanism 3 on the base plate 10, serves as an external force for driving the driving shaft 15 to move, realizes automatic opening of the clamp, and is convenient to apply to an automatic production line.

[0087] The above description is an explanation of the utility model, not a limitation of the utility model, the range defined by the utility model is referred to the claims, and any form of modification can be made within the protection range of the utility model.

Claims

1. A positioning fixture, characterized in that: Includes a substrate (10) for supporting a product (2). The substrate (10) is provided with a fixed limiting structure and an elastic limiting structure. The fixed limiting structure is fixedly mounted on the substrate (10). The elastic limiting structure includes: A drive shaft (15) is slidably mounted on the substrate (10); A spring (16) is disposed at the tail end of the drive shaft (15) and is in a compressed state, for elastically connecting the drive shaft (15) and the substrate (10). A connecting rod assembly is connected to the drive shaft (15), and a first elastic limiting member (13) and a second elastic limiting member (14) are fixedly installed on the connecting rod assembly; The drive shaft (15) moves under the restoring force of the spring (16) and changes the relative position between the fixed limiting structure, the first elastic limiting member (13) and the second elastic limiting member (14) through the linkage assembly, so that the fixed limiting structure, the first elastic limiting member (13) and the second elastic limiting member (14) all contact the outer peripheral surface of the product (2), thus defining the position of the product (2) on the substrate (10).

2. The positioning fixture as described in claim 1, characterized in that: The linkage assembly includes: The first link structure (18) has one end hinged to the base plate (10) and the other end hinged to the head end of the drive shaft (15). The first elastic limiting member (13) is fixedly installed in the middle of the first link structure (18). The second link structure (17) is hingedly mounted on the base plate (10). The second link structure (17) is connected to the middle of the drive shaft (15) via transmission. The second elastic limiting member (14) is fixedly mounted on the moving rod (172) of the second link structure (17). When the drive shaft (15) moves under the restoring force of the spring (16), the first link structure (18) and the second link structure (17) respectively drive the first elastic limiting member (13) and the second elastic limiting member (14) to move toward the product (2).

3. The positioning fixture as described in claim 2, characterized in that: It also includes a pair of linear bearings (19) that are coaxial and spaced apart on the substrate (10), the drive shaft (15) is slidably connected to the two linear bearings (19), and the second connecting rod structure (17) is located between the two linear bearings (19); A first limiting structure (151) is provided on one side of the first end of the drive shaft (15), and a limiting block (152) is provided at the tail end of the drive shaft (15). The spring (16) is sleeved on the drive shaft (15) between the linear bearing (19) adjacent to the limiting block (152) and the limiting block (152).

4. The positioning fixture as described in claim 2, characterized in that: The first linkage structure (18) includes a first arm (181) and a second arm (182). One end of the first arm (181) is hinged to the end of the drive shaft (15), and the other end of the first arm (181) is hinged to one end of the second arm (182). The other end of the second arm (182) is hinged to the base plate (10). The first elastic limiting member (13) is fixedly installed on the first arm (181). The second linkage structure (17) includes parallel swing rods (171), one end of each swing rod (171) is hinged to the base plate (10), the two swing rods (171) are respectively hinged to the ends of the moving rod (172), the two swing rods (171) and the moving rod (172) form a parallelogram linkage structure, and the second elastic limiting member (14) is fixedly installed on the moving rod (172); The middle part of a swing arm (171) is connected to the drive shaft (15) for transmission.

5. The positioning fixture as described in claim 4, characterized in that: The outer periphery of the product (2) is generally rectangular ring-shaped; The first elastic limiting member (13) is rod-shaped. One end of the first elastic limiting member (13) is fixedly connected to the first arm (181). The other end of the first elastic limiting member (13) is a first contact part. The second elastic limiting member (14) is provided with a second contact part. The first contact portion and the second contact portion are used to contact the outer peripheral surface of the product (2) and correspond to one set of adjacent sides of the rectangle, and the fixed limiting structure corresponds to another set of adjacent sides of the rectangle; The second contact portion is a plane, which is parallel to the axis of the drive shaft (15).

6. The positioning fixture as described in claim 5, characterized in that: It also includes a first hole group (131) and a second hole group (141). The first elastic limiting member (13) is detachably connected to the first arm (181) through the first hole group (131) for adjusting the relative position of the first elastic limiting member (13) and the first arm (181). The second elastic limiting member (14) is detachably connected to the moving rod (172) through the second hole group (141) for adjusting the relative position of the second elastic limiting member (14) and the moving rod (172).

7. The positioning fixture as described in claim 4, characterized in that: It also includes a shift fork (153) fixedly mounted on the drive shaft (15), the groove depth direction of the shift fork (153) being perpendicular to the axis of the drive shaft (15), and a connecting shaft (154) mounted on a swing arm (171), the connecting shaft (154) being slidably engaged with the groove of the shift fork (153).

8. The positioning fixture as described in claim 1, characterized in that: The fixed limiting structure includes a first fixed limiting member (11) and a second fixed limiting member (12) fixedly mounted on the substrate (10). The first fixed limiting member (11) and the second fixed limiting member (12) limit the position of the product (2) from two different directions.

9. The positioning fixture as described in claim 1, characterized in that: It also includes an automatic push rod mechanism (3), which includes a linear driver (31) fixedly connected to the base plate (10). The actuating end of the linear driver (31) is provided with a push rod (32), which corresponds to the tail end of the drive shaft (15) and is used to drive the drive shaft (15) to move.

10. The positioning fixture as described in claim 9, characterized in that: The linear actuator (31) is a cylinder.

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