CN104802031A - Cam positioning bidirectional continuous indexing table - Google Patents

Abstract

The invention discloses a cam positioning bidirectional continuous indexing workbench, which comprises: a base, a piston cylinder is arranged in the base; A plurality of indexing position holes are arranged on the table; a camshaft, the camshaft is rotatably supported on the base, and a cylindrical cam body and a plane cam body are arranged on the outer wall of the camshaft; a positioning pin, the positioning pin One end of the positioning pin matches with multiple indexing position holes, and the other end of the positioning pin abuts against the plane cam body so that when the camshaft rotates, the other end of the positioning pin can be inserted into or out of the indexing position under the action of the plane cam body Holes; rotary positioning components. Driven by the power source and the piston cylinder, the present invention can automatically realize the two-way continuous rotary indexing and accurate positioning of the workbench. Compared with the usual hydraulic indexing workbench, it not only solves the problems of two-way continuous indexing and positioning of the top teeth, etc. Problem, at the same time, cancel the gear/rack indexing mechanism, its indexing speed is fast, and the positioning is accurate and reliable.

Description

Cam positioning bidirectional continuous indexing table

technical field

The invention relates to a cam positioning bidirectional continuous indexing workbench, which can be widely used in various machine tools and belongs to the field of equipment manufacturing.

Background technique

At present, the indexing table is the most commonly used workpiece rotary indexing part for various machine tools. The indexing of the indexing table is generally realized by the rack/gear mechanism driven by the hydraulic piston cylinder; The disadvantage of this structure is that the workbench can only perform one-way, fixed-angle indexing and positioning, and the work efficiency is low; in addition, when the pressure of the hydraulic system, the stroke of the piston cylinder and the load of the workbench change, it may cause the division If the degree is not correct, there will be a problem that the teeth of the tooth plate top and cannot be positioned, and its reliability is low.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a cam positioning bidirectional continuous indexing workbench, which can automatically realize the bidirectional continuous rotary indexing and indexing of the workbench under the drive of the power source and the piston cylinder. Accurate positioning, compared with the usual hydraulic indexing table, it not only solves the problems of two-way continuous indexing and positioning top teeth, but also cancels the gear/rack indexing mechanism, which has fast indexing speed and accurate and reliable positioning .

In order to solve the above technical problems, the technical solution of the present invention is: a cam positioning bidirectional continuous indexing workbench, which includes:

a base, a piston cylinder is arranged in the base;

A table top, a limiting assembly that limits the relative rotational position of the table top and the base is arranged between the table top and the base, and a plurality of indexing position holes are arranged on the table top;

A camshaft, the camshaft is rotatably supported on the base, and the outer wall of the camshaft has a cylindrical cam body and a planar cam body;

Locating pin, one end of the locating pin matches with a plurality of indexing position holes, and the other end of the locating pin abuts against the plane cam body so that when the camshaft rotates, the other end of the locating pin can be moved under the action of the plane cam body Insert or disengage from the indexing position hole;

A rotary positioning assembly, the rotary positioning assembly is rotatably supported on the base, and the rotary positioning assembly cooperates with the cylindrical cam body of the camshaft so that when the camshaft rotates, the rotary positioning assembly can rotate on the base or be relatively stationary;

mandrel, the mandrel is fixedly connected with the table, and the mandrel is rotatably inserted on the piston rod of the piston cylinder, and a gear is fixedly installed on the mandrel, and the gear is meshed with the rotary positioning assembly; when When the piston rod of the piston cylinder moves upward, the piston rod drives the mandrel to disengage the limit assembly, and at the same time makes the gear mesh with the rotary positioning assembly; when the piston rod of the piston cylinder moves downward, the piston rod drives the mandrel to make The limit assembly is engaged, and at the same time the gear is disengaged from the rotary positioning assembly;

The camshaft driving assembly is connected with the camshaft transmission so as to drive the camshaft to rotate on the base; when the piston rod of the piston cylinder moves upward and the camshaft rotates, the positioning pin breaks away from the indexing position hole and at the same time When the rotary positioning assembly is rotated, the table and mandrel can rotate relative to the piston rod to achieve indexing.

Further provided is a specific structure of the limiting assembly, the limiting assembly includes an upper toothed plate and a lower toothed plate, the upper toothed plate is fixedly connected to the table, the lower toothed plate is fixedly connected to the base, and a plurality of The degree position hole is arranged on the upper toothed plate which is fixedly connected on the table, and the upper toothed plate and the lower toothed plate are engaged with each other so as to engage or disengage the limiting component.

Further, in order to ensure that the positioning pin can closely fit on the outer wall of the plane cam body and make it return automatically, the positioning pin is slidably inserted on the base, and the positioning pin is covered with a return spring, and the return spring One end of the pin is fixedly abutted, and the other end is abutted against the positioning pin.

A specific structure of a rotary positioning assembly is further provided, the rotary positioning assembly includes a rotary sleeve, a positioning plate and a plurality of positioning heads, the rotary sleeve is rotatably supported on the base, the positioning plate is fixedly connected with the rotary sleeve, the A plurality of positioning heads are arranged on the positioning plate, and the cylindrical cam body is provided with a cylindrical cam groove, and the positioning heads are slidingly matched with the cylindrical cam groove.

Further, the number of positioning heads is the same as the number of indexing position holes.

Further, in order to stabilize the cooperation between the positioning head and the cylindrical cam body and reduce the sliding friction force, the head of the positioning head is provided with rollers.

Further, the middle section of the cylindrical cam groove is a closed spiral lifting section, and both ends are open linear positioning sections. When the camshaft rotates until the positioning head is located in the spiral lifting section, the rotary positioning assembly rotates on the base, When the camshaft rotates until the positioning head is located in the linear positioning section, the rotary positioning assembly is relatively stationary on the base.

Further, in order to stabilize the cooperation between the positioning pin and the plane cam body and reduce its sliding friction force, a roller is provided at the end of the positioning pin abutting against the plane cam body.

After adopting the above-mentioned technical scheme, when the workbench rotates in indexing, the tabletop is raised by loosening/clamping the piston cylinder, the limit of the limit assembly is released, and then the nearest path is selected through the forward and reverse control of the camshaft. Degree positioning, after the camshaft rotates, first pull out the positioning pin from the table by the cooperation of the positioning pin and the plane cam body; After arriving, the table top is pre-positioned by the cooperation of the cylindrical cam body and the rotary indexing assembly; then the pin positioning is carried out through the insertion of the positioning pin and the indexing position hole. When the workbench needs continuous indexing, the above process can be repeated. until the desired position is reached. After the indexing is completed, the table top is clamped by the loose/clamp piston cylinder and the limit assembly is engaged, so that the table top is kept at an accurately positioned position. This indexing table can be directly controlled by the positive and negative rotation of the camshaft to achieve bidirectional continuous indexing and accurate positioning; it solves the problems of hydraulic drive, gear/rack indexing that cannot be bidirectionally continuously indexed and positioned top teeth, etc., and its indexing speed is fast, and positioning is accurate and reliable; easy.

Description of drawings

Fig. 1 is the structural sectional view of cam positioning bidirectional continuous indexing workbench of the present invention;

Fig. 2 is A-A sectional view of Fig. 1;

Fig. 3 is the connection schematic diagram of positioning plate and camshaft of the present invention;

Fig. 4 is the schematic structural view of the cylindrical cam body part on the camshaft of the present invention;

Fig. 5 is the expanded view of cylindrical surface cam body part on the camshaft of the present invention;

Fig. 6 is the schematic structural view of the planar cam body part on the camshaft of the present invention;

Fig. 7 is a schematic diagram of the movement height of the positioning pin of the present invention.

Detailed ways

In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

As shown in Figures 1 to 7, a cam positioning bidirectional continuous indexing workbench includes:

A base 1, a piston cylinder is arranged in the base 1;

The table top 2 is provided with a limit assembly between the table top 2 and the base 1 to limit the relative rotational position of the table top 2 and the base 1, and the table top 2 is provided with a plurality of indexing position holes 21;

A camshaft 16, the camshaft 16 is rotatably supported on the base 1, and the outer wall of the camshaft 16 has a cylindrical cam body 10 and a plane cam body 9;

Locating pin 7, one end of locating pin 7 cooperates with a plurality of index position holes 21, and the other end of locating pin 7 abuts with plane cam body 9 so that when camshaft 16 rotates, the other end of locating pin 7 can be on the plane. Under the action of the cam body 9, insert or disengage from the indexing position hole 21;

The rotary positioning assembly is rotatably supported on the base 1, and the rotary positioning assembly is matched with the cylindrical cam body 10 of the camshaft 16 so that when the camshaft 16 rotates, the rotary positioning assembly can rotate on the base 1 or relatively static;

The mandrel 5 is fixedly connected with the table top 2, and the mandrel 5 is rotatably inserted on the piston rod 6 of the piston cylinder. The mandrel 5 is also fixedly equipped with a gear 14, which is connected with the rotary positioning assembly. Mesh fit; when the piston rod 6 of the piston cylinder moves upward, the piston rod 6 drives the mandrel 5 to disengage the limit assembly, and at the same time makes the gear 14 mesh with the rotary positioning assembly; when the piston rod 6 of the piston cylinder moves downward When moving, the piston rod 6 drives the mandrel 5 to engage the limit assembly, and at the same time disengage the gear 14 from the rotary positioning assembly;

Camshaft driving assembly, the camshaft driving assembly is connected with the camshaft 16 so as to drive the camshaft 16 to rotate on the base 1; when the piston rod 6 of the piston cylinder moves upward, and the camshaft 16 rotates, the positioning pin 7 is separated from the indexing When the positioning hole 21 is opened and the rotary positioning assembly is rotated simultaneously, the table top 2 and the mandrel 5 can rotate relative to the piston rod 6 to achieve indexing.

As shown in Figure 1, the limit assembly includes an upper toothed plate 4 and a lower toothed plate 3, the upper toothed plate 4 is fixedly connected to the table 2, the lower toothed plate 3 is fixedly connected to the base 1, and a plurality of indexing position holes 21 are arranged on the table 2, on the upper toothed plate 4 fixedly connected, the upper toothed plate 4 and the lower toothed plate 3 are engaged with each other so as to engage or disengage the limiting assembly.

As shown in FIG. 1 , the positioning pin 7 is slidably inserted on the base 1 , and the positioning pin 7 is covered with a return spring 8 . One end of the return spring 8 is fixedly abutted against, and the other end is abutted against the positioning pin 7 .

As shown in Figure 1, the rotary positioning assembly includes a rotary sleeve 13, a positioning disc 12 and a plurality of positioning heads 121, the rotary sleeve 13 is rotatably supported on the base 1, the positioning disc 12 is fixedly connected with the rotary sleeve 13, and a plurality of positioning heads 121 is arranged on the positioning plate 12, the cylindrical cam body 10 is provided with a cylindrical cam groove, and the positioning head 121 is slidingly matched with the cylindrical cam groove.

The number of positioning heads 121 is the same as the number of indexing position holes 21 .

As shown in FIG. 1 , the head of the positioning head 121 is provided with a roller 11 .

As shown in Figures 4 and 5, the middle section of the cylindrical cam groove is a closed spiral lifting section, and both ends are open linear positioning sections. When the camshaft 16 rotates until the positioning head 121 is located in the spiral lifting section, the rotary positioning The assembly rotates on the base 1, and when the camshaft 16 rotates until the positioning head 111 is located in the linear positioning section, the rotary positioning assembly is relatively stationary on the base 1.

As shown in FIG. 1 , a roller 11 is provided at the end of the positioning pin 7 abutting against the plane cam body 9 .

The working principle of the present invention is as follows:

When oil enters the lower chamber of the piston cylinder and the workbench is released, the piston rod 6 will drive the table 2, the upper toothed disc 4, the mandrel 5, and the gear 14 to move upward through the plane bearing 15, so that the upper toothed disc 4 and the lower gear The disc 3 is disengaged; at the same time, the gear 14 meshes with the inner ring gear of the positioning disc 12. When the workbench is loosened and the positioning pin 7 is pulled out, if the positioning disc 12 rotates, the gear 14 can drive the mandrel 5 and the table 2 to rotate. Piston rod 6 rotates inside to carry out worktable indexing. When the upper cavity of the clamping oil cylinder enters the oil and clamps the worktable, the piston rod 6 will pass through the plane bearing 15 to drive the table top 2, upper toothed disc 4, mandrel 5 and gear 14 moves downwards so that the upper toothed disc 4 and the lower toothed disc 3 are meshed, and the workbench is accurately positioned and maintained; at the same time, the gear 14 and the ring gear of the positioning disc 12 are disengaged.

The plane cam body 9 and the cylindrical cam body 10 are uniformly arranged on the camshaft 16, and the camshaft 16 is connected with the camshaft driving assembly, that is, the driving motor and the reduction box 17. When the camshaft 16 rotates, the cylindrical cam body 10 can be driven. The cooperation with the positioning plate 12 and the synchronous movement of the plane cam body 9 and the positioning pin 7 automatically realize the rotary indexing and accurate positioning of the workbench.

The upper ring gear 4 is processed with indexing position holes 21 that are consistent with the indexing positions of the worktable. The positioning pin 7 and the return spring 8 are installed on the base 1 and the lower ring gear 3. When the positioning pin 7 is inserted into the upper ring gear 4 When indexing the position hole 21, the workbench can be positioned accurately. After the workbench is unclamped, as the drive motor is started, the drive motor will drive the camshaft 16 to rotate through the reduction box 17. At the initial stage of the camshaft 16 rotation, the roller 11 on the positioning head 121 of the positioning disc 12 is engaged with the linear positioning groove of the cylindrical cam body 10, and the positioning disc 12 does not produce rotary motion; while the radius of the plane cam body 9 becomes smaller rapidly , The positioning pin 7 is pulled out downward under the action of the return spring 8, and the positioning of the workbench is released. After the indexing of the workbench is in place, the roller 11 on the positioning head 121 of the positioning disc 12 engages with the linear positioning groove of the cylindrical cam body 10 again, and the positioning disc 12 stops rotating; while the radius of the plane cam body 9 increases rapidly, forcing The positioning pin 7 is inserted into the index position hole 21 of the upper chainring 4, and the workbench is accurately positioned.

Used for table indexing and pre-positioning. After the worktable is released and the positioning pin 7 is pulled out, the radius of the plane cam body 9 will remain unchanged, and the positioning pin 7 will remain in the pin-out state; while the roller 11 on the positioning pin 7 It will mesh with the spiral lifting groove of the cylindrical cam body 10. Therefore, the rotation of the cylindrical cam body 10 will drive the positioning plate 12, the gear 14, the mandrel 5 and the table 2 to perform rotary indexing. After the indexing position is reached, the cylindrical The roller 11 of the cam body 10 engages with the spiral lifting groove of the cylindrical cam body 10 again, and the roller 11, the positioning plate 12, the gear 14, the mandrel 5 and the table 2 of the cylindrical cam body 10 stop moving and pre-position; The cooperating movement of the cam body 9 and the positioning pin 7 will complete the bolt action and carry out the accurate positioning of the workbench.

The number of rollers 11 consistent with the number of indexing positions of the workbench is evenly installed on the positioning plate 12. The cylindrical cam body 10 is processed with a cylindrical cam groove. The middle of the cylindrical cam groove is a closed spiral lifting section, and the two ends are open. When the cylindrical cam body 10 rotates clockwise as shown in the figure, the roller A will enter the spiral lifting section of the cylindrical cam groove, and it will be moved to the roller B under the push of the cylindrical cam groove. position, thereby driving the positioning plate 12 and the worktable to rotate clockwise through an indexing angle; at the same time, the roller C will be moved to the position of the roller A to prepare for the rotary indexing of the next indexing angle.

When roller A reaches the position of roller B, both roller A and roller C will enter the linear positioning section of the spiral groove. At this time, the rotation of the camshaft 16 will not cause the movement of the rollers, and the positioning plate 12 and the worktable are positioned and maintained. Workbench pre-positioning. As the cylindrical cam body 10 continues to rotate, it will push the roller C to the position of the roller B, and continue to drive the positioning plate 12 and the worktable to turn an indexing angle, and so on.

The cylindrical surface of the cylindrical cam body 10 is processed with a spiral lifting section and a linear positioning section. When the camshaft 16 rotates, its linear positioning section can push the roller 11, drive the positioning disc 12 and the worktable to rotate and index; its linear positioning section can Make positioning disk 12 and workbench positioning keep. In order to ensure the continuous and stable indexing rotation as much as possible, and at the same time have enough intervals to ensure positioning, the spiral lifting section of the cam groove is connected by two equal-diameter tangent arcs, and the length is set at about 240°; the length of the linear positioning section is set as About 120°.

Plane cam body 9 is made up of the circular arc of two sections smooth transition of bolt and pull out pin, and the length of bolt segment arc is matched with the length of the linear positioning section of cylindrical cam body 10; The length of the spiral lifting section matches; the diameter difference of the two arcs is consistent with the stroke of the bolt.

The principle of the present invention is: using the above-mentioned structure, accurate positioning and holding can be realized through the piston cylinder; through the motion coordination between the cylindrical cam body and the positioning plate and the motion coordination between the plane cam body and the positioning pin, the two-way continuous rotation of the workbench can be realized. Degree and accurate positioning, its structure is simple, the indexing speed is fast, and the positioning is accurate and reliable.

With the indexing workbench of the present invention, its bidirectional indexing and positioning can be realized simply through the forward and reverse control of the drive motor, the control is easy, and the installation and adjustment are convenient.

All parts involved in the invention have simple structure, convenient processing and low manufacturing cost.

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects solved by the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (8)

1. A cam positioning bidirectional continuous indexing workbench, characterized in that it comprises: The base (1), the base (1) is provided with a piston cylinder; The table top (2), a limit assembly is arranged between the table top (2) and the base (1) to limit the relative rotation position of the table top (2) and the base (1), and the table top (2) is provided with a plurality of degree position hole (21); A camshaft (16), the camshaft (16) is rotatably supported on the base (1), and the outer wall of the camshaft (16) has a cylindrical cam body (10) and a plane cam body (9); Locating pin (7), one end of the locating pin (7) matches with a plurality of indexing position holes (21), and the other end of the locating pin (7) abuts against the plane cam body (9) so as to act as the camshaft ( 16) When rotating, the other end of the positioning pin (7) can be inserted into or out of the indexing position hole (21) under the action of the plane cam body (9); A rotary positioning assembly, the rotary positioning assembly is rotatably supported on the base (1), and the rotary positioning assembly cooperates with the cylindrical cam body (10) of the camshaft (16) so that when the camshaft (16) rotates, The rotary positioning assembly can be rotated on the base (1) or relatively stationary; The mandrel (5), the mandrel (5) is fixedly connected with the table (2), and the mandrel (5) is rotatably inserted on the piston rod (6) of the piston cylinder, and the mandrel (5) is also fixed A gear (14) is installed, and the gear (14) meshes with the rotary positioning assembly; when the piston rod (6) of the piston cylinder moves upward, the piston rod (6) drives the mandrel (5) to limit The position assembly is disengaged, and at the same time, the gear (14) is engaged with the rotary positioning assembly; when the piston rod (6) of the piston cylinder moves downward, the piston rod (6) drives the mandrel (5) to engage the limit assembly, And at the same time, the gear (14) is disengaged from the rotary positioning assembly; The camshaft driving assembly is connected with the camshaft (16) in transmission so as to drive the camshaft (16) to rotate on the base (1); when the piston rod (6) of the piston cylinder moves upward, and the camshaft (16) When rotating the positioning pin (7) out of the indexing position hole (21) and rotating the rotary positioning assembly at the same time, the table (2) and mandrel (5) can rotate relative to the piston rod (6) so that Achieve graduation. 2. The cam positioning bidirectional continuous indexing table according to claim 1, characterized in that: the limit assembly includes an upper toothed plate (4) and a lower toothed plate (3), and the upper toothed plate (4 ) is fixedly connected with the table top (2), the lower toothed plate (3) is fixedly connected with the base (1), and a plurality of indexing position holes (21) are set on the upper toothed plate (4) fixedly connected with the table top (2) On the top, the upper toothed plate (4) and the lower toothed plate (3) are engaged with each other so as to engage or disengage the limit assembly. 3. The cam positioning bidirectional continuous indexing table according to claim 1 or 2, characterized in that: the positioning pin (7) is slidably inserted on the base (1), and the positioning pin (7) The jacket is provided with a return spring (8), one end of the return spring (8) is fixedly abutted, and the other end is abutted against the positioning pin (7). 4. The cam positioning bidirectional continuous indexing table according to claim 1 or 2, characterized in that: the rotary positioning assembly includes a rotary sleeve (13), a positioning disc (12) and a plurality of positioning heads (121) , the rotary sleeve (13) is rotatably supported on the base (1), the positioning disc (12) is fixedly connected with the rotary sleeve (13), and the plurality of positioning heads (121) are arranged on the positioning disc (12), so The cylindrical cam body (10) is provided with a cylindrical cam groove, and the positioning head (121) is slidingly matched with the cylindrical cam groove. 5. The cam positioning bidirectional continuous indexing table according to claim 4, characterized in that the number of said positioning heads (121) is the same as the number of indexing position holes (21). 6. The cam positioning bidirectional continuous indexing table according to claim 4, characterized in that: the head of the positioning head (121) is provided with a roller (11). 7. The cam positioning bidirectional continuous indexing workbench according to claim 4, characterized in that: the middle section of the cylindrical cam groove is a closed spiral lifting section, and both ends are open linear positioning sections, when the camshaft ( 16) When rotating until the positioning head (121) is located in the spiral lifting section, the rotary positioning assembly rotates on the base (1), and when the camshaft (16) rotates until the positioning head (121) is located in the linear positioning section, the The rotary positioning assembly is relatively stationary on the base (1). 8. The cam positioning bidirectional continuous indexing table according to claim 1 or 2, characterized in that: the end of the positioning pin (7) abutting against the plane cam body (9) is provided with a roller (11).