CN215701132U - Positioning device - Google Patents

Abstract

The application relates to a positioning device, and belongs to the technical field of clamps. The positioning device includes: a bottom plate for carrying a product tray; a tray guiding and positioning mechanism for guiding the product tray placed on the bottom plate to a preset position and positioning the product tray; a plurality of balls disposed on a surface of a base plate, the balls configured to enable the product tray to move on the base plate as guided by the tray guide positioning mechanism. According to the product tray positioning device, the tray guiding and positioning mechanism is arranged to guide and limit the product tray, so that the final placement precision of the tray is effectively improved, and the precision requirement of manually or mechanically placing the product tray on the bottom plate is reduced; the tray has the advantages of good fool-proof performance and strong mistake-proof performance, is convenient for shortening the material placing time when the tray is placed manually or mechanically, and enables the material placing operation to be simple and convenient, thereby effectively saving the material cost of material placing.

Description

Positioning device

Technical Field

The application relates to the technical field of clamp design, in particular to a positioning device.

Background

In the production and manufacturing process of the battery, the battery core needs to be positioned and then the battery core with fixed position is processed, the battery core is generally positioned by the clamp, and the automatic connection of the product clamp and the equipment is realized.

In actual production, the positioning accuracy requirement of part of processes on the battery cell is very high, the positioning accuracy requirement of a common positioning fixture is difficult to achieve, or the discharging accuracy in the initial discharging process is improved in order to achieve the production accuracy requirement, the discharging difficulty is high, and the operation simplicity is poor.

SUMMERY OF THE UTILITY MODEL

The purpose of this application lies in: the positioning device is provided, the requirement on discharging precision is effectively reduced, and the positioning precision is improved.

An embodiment of the present application provides a positioning device, including: a bottom plate for carrying a product tray; a plurality of balls provided on a surface of the base plate, the balls being configured to enable the product tray to move on the base plate in accordance with guidance of the tray guide positioning mechanism; and the tray guiding and positioning mechanism is used for guiding the product tray placed on the bottom plate to a preset position and positioning the product tray.

In the technical scheme, the tray guiding and positioning mechanism is arranged to guide and limit the product trays, so that the product trays bearing products are directly placed on the bottom plate during actual positioning, the tray guiding and positioning mechanism guides and then limits the product trays, and the product trays are limited at preset positions, so that the final placement accuracy of the trays is effectively improved, and the placement accuracy of the products in the product trays is improved; on the other hand, the precision requirement of manually or mechanically placing the product tray on the bottom plate is effectively reduced, the foolproof performance is good, the mistake proofing performance is strong, the material placing time of manually or mechanically placing the tray is convenient to shorten, the material placing operation is simple and convenient, and the material cost of material placing is effectively saved; set up a plurality of balls and tray guiding orientation mechanism and cooperate on the bottom plate, make things convenient for the product tray can remove along with tray guiding orientation mechanism's direction drive power on the bottom plate, reduce tray guiding orientation mechanism's direction resistance to prevent that the tray from can't carrying out position control along with tray guiding orientation mechanism because of frictional force is too big on the bottom plate, ensure the spacing stability of tray direction.

In some embodiments, the tray guide positioning mechanism comprises: the two guide clamping pieces are oppositely positioned on two opposite sides of the bottom plate; the linear reciprocating driving mechanism is configured to drive the two guide clamping pieces to synchronously move horizontally in opposite directions to guide and position the product tray on the bottom plate or drive the two guide clamping pieces to horizontally move in opposite directions to release the positioning of the product tray.

In the technical scheme, the tray guiding and positioning mechanism comprises two guiding clamping pieces which are oppositely arranged on two opposite sides of the bottom plate, the two guiding clamping pieces are driven by the reciprocating linear driving mechanism to move in opposite directions or move in opposite directions, namely the tray guiding and positioning mechanism guides and finally limits the product trays from two sides of the product trays to the center, on one hand, the two sides of the guiding and limiting force applied to the product trays are balanced, the moving distance of the product trays after being subjected to the guiding force is small, and compared with unilateral guiding and limiting, the problems that the product trays slide on the bottom plate greatly to cause the deviation of the product trays and cause the failure of limiting can be effectively avoided, so that the stability of guiding and limiting is ensured; on the other hand, the central point of the product tray is fixed after limiting, and the position of the product tray after limiting every time is fixed, so that subsequent feeding, blanking or other processing operations are conveniently carried out on the product tray.

In some embodiments, the guide clamping piece is provided with a V-shaped guide limiting groove, an opening of the V-shaped guide limiting groove faces horizontally to a product tray placed on the bottom plate, and the V-shaped guide limiting groove is used for being matched with a limiting cylinder of the product tray.

Among the above-mentioned technical scheme, the direction of direction holder and product tray is spacing to be accomplished through V type direction spacing groove and complex spacing post with it, and V type direction spacing groove is direct to spacing cylinder and plays stable direction limiting displacement through the interact between the shape, simple structure, and stability is high, and the practicality is strong.

In some embodiments, the linear reciprocating driving mechanism comprises two air cylinders, and the actuating ends of the two air cylinders are respectively connected with one guide clamping piece. The cylinder is low in cost, convenient to control, capable of meeting the precision requirement and high in practicability.

In some embodiments, the positioning device further comprises: the base is arranged below the bottom plate; and the product positioning mechanism is arranged on the base and is used for positioning the product borne on the product tray.

In the technical scheme, the positioning device comprises a tray guiding and positioning mechanism acting on the product tray and a product positioning mechanism acting on the product tray, the product tray is positioned on the bottom plate under the action of the tray guiding and positioning mechanism on the bottom plate, so that a product on the product tray is preliminarily positioned, and then the product on the product tray is directly and finely positioned through the product positioning mechanism, so that the positioning precision of the product is effectively improved; during actual positioning, a product tray bearing a product is directly placed on the bottom plate, and then product fine positioning is finished in multiple times, so that on one hand, the positioning precision is high, the positioning strength is reliable, and the product is prevented from shifting due to unstable positioning when the positioned product is processed; on the other hand, the whole positioning device is good in fool-proofing performance and strong in mistake proofing performance, the manual or mechanical tray discharging time is conveniently shortened, the discharging precision requirement is reduced, the feasibility and the processing yield of continuous production are improved, and the material cost input of feeding is reduced.

In some embodiments, the positioning mechanism comprises: the positioning clamping pieces are distributed on the periphery of the bottom plate and are arranged on the base in a centripetal sliding mode, and each positioning clamping piece is provided with a clamping portion acting on a product to be positioned; the positioning driving mechanism is arranged on the base and is used for driving the plurality of positioning clamping pieces to synchronously and centripetally slide and clamp and position a product on the product tray or driving the plurality of positioning clamping pieces to centrifugally slide and eliminate clamping and positioning of the product.

Among the above-mentioned technical scheme, set up a plurality of location holders, a plurality of location holders are driven by a location drive power, a plurality of location holders act on the product tray in step, make the product fix a position to the heart, save power on the one hand, on the other hand guarantees the synchronism and the equilibrium of a plurality of location holders atresss, thereby guarantee that the product receives the synchronism and the stability of clamping power, improve product positioning stability and effectively avoid the product to be because of the unbalanced deflection of atress is impaired even in the positioning process.

In some embodiments, the positioning driving mechanism comprises a rotary seat and connecting rods with the same number as the positioning clamping pieces, the rotary seat is horizontally and rotatably arranged on the base, and the rotary seat is connected with the rotation driving mechanism; the rotating seat and the positioning clamping piece are connected through a connecting rod, and two ends of the connecting rod are respectively connected with the rotating seat and the positioning clamping piece in a rotating mode.

Among the above-mentioned technical scheme, location actuating mechanism adopts the mechanical linkage actuating mechanism of swivel mount drive connecting rod, ensures that location holder atress is balanced stable, and whole drive stability is strong, and the precision is high.

In some embodiments, the positioning device further comprises a sliding rail block assembly corresponding to each of the plurality of positioning clamps, each sliding rail block assembly being disposed on the base; each positioning clamping piece is arranged on the base in a sliding mode through the sliding rail and sliding block component corresponding to the positioning clamping piece.

Among the above-mentioned technical scheme, every location holder passes through the slide rail sliding block set up on the base that slides of slide rail sliding block set spare, realizes the slip function of location holder on the one hand, and on the other hand slide rail plays certain direction supporting function to the slip of location holder, further improves the stability of location holder at the slip in-process.

In some embodiments, each clamping member comprises a supporting beam and a plurality of clamping arms, the supporting beam is slidably arranged on the base, the plurality of clamping arms are connected to the supporting beam and are distributed at intervals along the side edge of the product to be positioned, the top ends of the clamping arms form a clamping part, and the action surface of the clamping part is perpendicular to the side edge of the product to be positioned.

Be equipped with a plurality of clamping parts on every location holder, form a plurality of exposed core points along its side to the product, effectively increase product lifting surface area, dispersion clamping-force on the one hand, avoid the atress to concentrate and cause the clamp to hinder to the product, on the other hand a plurality of exposed core points produce a plurality of limit points to the product, ensure that the product receives the equilibrium of clamping-force, avoid product atress off normal to effectively guarantee product positioning accuracy and stability.

In some embodiments, the active surface of the clamping portion is provided with a cushioning layer.

The buffer layer forms the flexible contact when the clamping part acts on the product, effectively avoids the clamping part to treat the product of location and cause the collision scratch.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic diagram of an overall structure of a product tray positioned by a positioning device according to some embodiments of the present disclosure;

FIG. 2 is a schematic structural view of a tray guiding and positioning mechanism provided in some embodiments of the present application;

FIG. 3 is a schematic structural diagram of a positioning device according to some embodiments of the present disclosure;

FIG. 4 is a schematic structural view of a product positioning mechanism provided in some embodiments of the present application;

fig. 5 is a schematic diagram of a state in which a battery cell provided in some embodiments of the present application is positioned in a positioning device.

Icon: 10-base, 20-bottom plate, 30-ball, 40-tray guiding and positioning mechanism, 41-limiting cylinder, 42-V-shaped guiding and limiting groove, 43-guiding clamping piece, 44-cylinder, 50-product tray, 60-product positioning mechanism, 61-positioning clamping piece, 611-supporting beam, 612-clamping arm, 613-clamping part, 62-rotating seat, 63-connecting rod, 631-first connecting rod, 632-second connecting rod, 64-motor, 70-electric core and 80-sliding rail block component.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

It should be noted that the product in the present application may be a variety of products with positioning requirements, and for convenience of description, the following embodiment describes a product to be positioned as a battery cell.

Referring to fig. 1, a positioning device according to some embodiments of the present application is shown, including: a base plate 20 for carrying a product tray 50; a tray guiding and positioning mechanism 40, the tray guiding and positioning mechanism 40 being used for guiding the product tray 50 placed on the bottom plate 20 to a preset position and positioning the product tray 50; a plurality of balls 30 provided on a surface of the base plate 20, the balls 30 being configured such that the product tray 50 can move on the base plate 20 with the guidance of the tray guide positioning mechanism 40.

It can be understood that, a profiling limiting groove for preliminary limiting of the battery cell 70 may be provided on the product tray 50, the size of the bottom surface in the profiling limiting groove is slightly larger than the size of the battery cell 70, so that preliminary limiting of the battery cell 70 is facilitated when the battery cell 70 is placed on the product tray 50.

Alternatively, the tray guiding and positioning mechanism can be a mechanism for performing copying guiding and limiting by using the edge of the product tray or a mechanism for performing degree oblique guiding and positioning by using the top angle of the product tray. For example, when the product tray is the rectangle, two diagonal angle departments that lie in the product tray on the bottom plate set up the right angle direction stopper along the diagonal motion of product tray, and two right angle direction stoppers move in opposite directions, can lead spacingly to the product tray.

In some embodiments, the tray guide positioning mechanism 40 includes: two guide clamping pieces 43, wherein the two guide clamping pieces 43 are oppositely positioned at two opposite sides of the bottom plate 20; and the linear reciprocating driving mechanism is configured to drive the two guide clamping pieces 43 to synchronously move horizontally and oppositely to guide the product tray 50 on the bottom plate 20 and position the product tray or drive the two guide clamping pieces 43 to horizontally and oppositely move to release the positioning of the product tray 50.

Referring to fig. 2, in some embodiments, the guiding and clamping member 43 is provided with a V-shaped guiding and limiting groove 42, an opening of the V-shaped guiding and limiting groove 42 faces horizontally to the product tray 50 placed on the bottom plate 20, and the V-shaped guiding and limiting groove 42 is used for being matched with the limiting cylinder 41 of the product tray 50.

It can be understood that two sides of the product tray 50 are vertically provided with the limiting cylinders 41, and the two limiting cylinders 41 correspond to the two V-shaped guiding limiting grooves 42 one by one; the diameters of the two limiting cylinders 41 are smaller than the opening width of the V-shaped guide limiting groove 42; the two limiting cylinders 41 are arranged to gradually abut against the limiting cylinders 41 in the V-shaped guiding and limiting grooves 42 on the guiding and clamping members 43 during the opposite movement of the two guiding and clamping members 43, so as to guide and position the product tray 50. The guide limiting groove 42 and the limiting cylinder 41 matched with the guide limiting groove are arranged on the guide clamping piece 43 and the product tray 50 in a limiting mode, the V-shaped guide limiting groove 42 directly plays a stable guide limiting role for the limiting cylinder 41 through interaction between shapes, and the guide clamping piece is simple in structure, high in stability and high in practicability.

Wherein, the limiting cylinder 41 is vertically fixed at the bottom of the product tray 50. The guide clamping piece 43 tightly supports the limiting cylinder 41, so that the interference to the working surface and the side edge of the product tray 50 is avoided, and the product tray 50 is convenient to perform other operations.

The linear reciprocating driving mechanism may use a bidirectional screw or a bidirectional cylinder 44, and the two guide holders 43 are connected to two actuating ends of the bidirectional screw or the bidirectional cylinder 44 in opposite directions to have a driving force for moving the two guide holders toward or away from each other.

Illustratively, as shown in fig. 3, the base plate 20 is fixedly mounted on the base 10, the linear reciprocating driving mechanism includes two unidirectional air cylinders 44, the cylinder bodies of the two air cylinders 44 are fixed on the base 10, and the actuating ends of the two air cylinders 44 are respectively connected with a guiding clamping plate. The cylinder 44 is low in cost, convenient to control, capable of meeting the precision requirement and high in practicability.

When the product tray 50 is limited, the product tray 50 is placed on the bottom plate 20, the two cylinders 44 drive the two guide clamping plates to move oppositely, the two V-shaped guide limiting grooves 42 generate guide force to the two limiting cylinders 41, the position of the product tray 50 on the ball 30 is adjusted along with the V-shaped guide limiting grooves 42, finally, the limiting cylinders 41 are tightly clamped in the V-shaped guide limiting grooves 42, so that the product tray 50 is limited on the bottom plate 20, it will be appreciated that the product trays 50 are not randomly oriented when placed on the base 20, but the product tray 50 is placed on the bottom plate 20 with low precision requirement which can be easily achieved by manpower or machinery, so that the limit cylinder 41 is positioned in the opening range of the V-shaped guide limit groove 42, of course, a fool-proof mechanism may be disposed on the bottom plate 20 to assist the product tray 50 to be placed on the bottom plate 20.

In other embodiments, referring to fig. 1, the positioning apparatus further includes: and the product positioning mechanism 60 is arranged on the base 10, and the product positioning mechanism 60 is used for positioning the products carried on the product tray 50.

As shown in fig. 3 and 4, in some embodiments, the positioning mechanism comprises: a plurality of positioning clamping pieces 61, wherein the positioning clamping pieces 61 are distributed on the periphery of the bottom plate 20 and are arranged on the base 10 in a centripetal sliding manner, and each positioning clamping piece 61 is provided with a clamping part 613 for acting on a product to be positioned; and the positioning driving mechanism is arranged on the base 10 and is used for driving the plurality of positioning clamping pieces 61 to synchronously and centripetally slide, clamp and position the product on the product tray 50 or driving the plurality of positioning clamping pieces 61 to centrifugally slide to eliminate clamping and positioning of the product.

In some embodiments, the positioning driving mechanism includes a rotary seat 62 and a number of connecting rods 63 equal to the number of the positioning holders 61, the rotary seat 62 is horizontally and rotatably disposed on the base 10, and the rotary seat 62 is connected with a rotation driving mechanism; the rotating seat 62 and the positioning clamping piece 61 are connected through a connecting rod 63, and two ends of the connecting rod 63 are respectively connected with the rotating seat 62 and the positioning clamping piece 61 in a rotating mode.

The positioning driving mechanism adopts a mechanical linkage driving mechanism of a rotating seat 62 driving a connecting rod 63, so that the stress of the positioning clamping piece 61 is ensured to be balanced and stable, the whole driving stability is strong, and the precision is high.

In some embodiments, the positioning device further includes slide rail slider assemblies 80 corresponding to the plurality of positioning clamps 61, respectively, each slide rail slider assembly 80 being disposed on the base 10; each positioning clamp 61 is slidably disposed on the base 10 through a corresponding sliding rail slider assembly 80.

As shown in fig. 4, in some embodiments, the positioning clamp 61 includes a support beam 611 and a plurality of clamp arms 612, the support beam 611 is slidably disposed on the base 10 through the sliding rail assembly 80, the plurality of clamp arms 612 are connected to the support beam 611 and spaced apart along a side edge of the product to be positioned, top ends of the clamp arms 612 form a clamp portion 613, an active surface of the clamp portion 613 is parallel to the side edge of the product to be positioned, and an active surface of the clamp portion 613 is provided with a cushioning layer.

For example, referring to fig. 3 to 5, the battery cell 70 has a rectangular structure, four positioning clamping pieces 61 are provided, and four positioning clamping pieces 61 are distributed on four sides of the battery cell 70 to be positioned; the rotation axis of the rotating base 62 passes through the positioning center of the cell 70 to be positioned, the connecting rod 63 includes a first connecting rod 631 and a second connecting rod 632, the supporting beams 611 of the two positioning clamping members 61 located at two sides of the cell 70 to be positioned in the width direction are both connected to the rotating base 62 through the second connecting rod 632, the supporting beams 611 of the two positioning clamping members 61 located at two sides of the cell 70 to be positioned in the length direction are both connected to the rotating base 62 through the first connecting rod 631, the length of the two first connecting rods 631 is greater than the length of the two second connecting rods 632, the rotating base 62 drives the cell 70 to rotate in a forward and reverse direction through the motor 64, each supporting beam 611 is provided with two clamping arms 612, the action surface of the clamping part 613 is vertically arranged and parallel to the side surface of the cell 70 to be positioned, the motor 64 drives the rotating base 62 to rotate, the four positioning clamping members 61 approach to the four side surfaces of the cell 70 and finally clamp the cell 70 to be fixed, the motor 64 drives the rotating base 62 to rotate in a reverse direction, the four positioning holders 61 are away from the four sides of the cell 70, and the positioning of the cell 70 is released.

When the positioning device is used for positioning, the product tray 50 loaded with the battery cell 70 is placed on the bottom plate 20, the two cylinders 44 drive the two guide clamping plates to move oppositely, the two V-shaped guide limiting grooves 42 generate guide force for the two limiting cylinders 41, the position of the product tray 50 on the ball 30 is adjusted along with the V-shaped guide limiting grooves 42, and finally, the limiting cylinders 41 are tightly clamped in the V-shaped guide limiting grooves 42, so that the product tray 50 is positioned on the bottom plate 20; after the product tray 50 is positioned on the bottom plate 20, the motor 64 drives the rotation seat 62 to rotate, the four positioning clamping pieces 61 approach to the four sides of the battery cell 70 and finally clamp and fix the battery cell 70, of course, the motor 64 drives the rotation seat 62 to rotate in the opposite direction, and the four positioning clamping pieces 61 are away from the four sides of the battery cell 70, so as to loosen the positioning of the battery cell 70.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The above embodiments are merely for illustrating the technical solutions of the present application and are not intended to limit the present application, and those skilled in the art can make various modifications and variations of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A positioning device, comprising:

a bottom plate for carrying a product tray;

a tray guiding and positioning mechanism for guiding the product tray placed on the bottom plate to a preset position and positioning the product tray;

a plurality of balls disposed on a surface of a base plate, the balls configured to enable the product tray to move on the base plate as guided by the tray guide positioning mechanism.

2. A positioning device as set forth in claim 1 wherein said tray guide positioning mechanism comprises:

the two guide clamping pieces are oppositely positioned on two opposite sides of the bottom plate;

the linear reciprocating driving mechanism is configured to drive the two guide clamping pieces to synchronously move horizontally and oppositely to guide and position the product tray on the bottom plate or drive the two guide clamping pieces to horizontally move oppositely to release the positioning of the product tray.

3. The positioning device as claimed in claim 2, wherein the guiding and holding member is provided with a V-shaped guiding and limiting groove, an opening of the V-shaped guiding and limiting groove faces horizontally to the product tray placed on the bottom plate, and the V-shaped guiding and limiting groove is used for being matched with a limiting cylinder of the product tray.

4. The positioning device as claimed in claim 2, wherein the linear reciprocating drive mechanism comprises two air cylinders, and the actuating ends of the two air cylinders are respectively connected with one of the guide clamping pieces.

5. A positioning device as set forth in claim 1, further comprising:

the base is arranged below the bottom plate;

and the product positioning mechanism is arranged on the base and is used for positioning the product borne on the product tray.

6. A positioning device as set forth in claim 5 wherein said product positioning mechanism includes:

the positioning clamping pieces are distributed on the periphery of the bottom plate and are arranged on the base in a centripetal sliding mode, and each positioning clamping piece is provided with a clamping portion acting on a product to be positioned;

the positioning driving mechanism is arranged on the base and is configured to drive the plurality of positioning clamping pieces to synchronously and centripetally slide and clamp and position the product or drive the plurality of positioning clamping pieces to synchronously and centrifugally slide and eliminate clamping and positioning of the product.

7. The positioning device as claimed in claim 6, wherein the positioning driving mechanism comprises a rotary base and a number of connecting rods equal to the number of the positioning holders, the rotary base is horizontally and rotatably disposed on the base, and a rotation driving mechanism is connected to the rotary base; the rotary seat and each of the positioning clamping pieces are connected through one connecting rod, and two ends of the connecting rod are respectively connected with the rotary seat and the positioning clamping pieces in a rotating mode.

8. The positioning device as set forth in claim 6, further comprising slide block assemblies respectively corresponding to the plurality of positioning clamps, each of the slide block assemblies being disposed on the base; each positioning clamping piece is arranged on the base in a sliding mode through the sliding rail and sliding block assembly corresponding to the positioning clamping piece.

9. A positioning device as set forth in claim 6, wherein each of said holding members includes a support beam slidably disposed on said base and a plurality of holding arms connected to said support beam and spaced apart along the side edges of the product to be positioned, the top ends of said holding arms forming said holding portions, the active surfaces of said holding portions being perpendicular to the side edges of the product to be positioned.

10. A positioning device as set forth in claim 6, characterized in that the active surface of the clamping portion is provided with a damping layer.

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