Front through stroke adjusting mechanism of cold header

Abstract

The utility model discloses a front pass stroke adjusting mechanism of a cold header, which comprises a frame, a crankshaft, a main connecting rod, a large connecting rod, a small connecting rod, a rotating shaft, a cam and a front pass push rod are mounted on the frame, the cam is in transmission connection with the front pass push rod through a transmission component, the crankshaft drives the main connecting rod to swing back and forth, and the main connecting rod drives the large connecting rod to swing. The large connecting rod drives the small connecting rod to swing, the other end of the small connecting rod is connected to the rotating shaft, the small connecting rod drives the rotating shaft to rotate back and forth at a certain angle, the cam is rotatably and adjustably installed on the rotating shaft, two or more protruding parts are arranged on the circumferential wall of the cam, and the protruding heights of the protruding parts are different. The protruding part of the cam is in transmission connection with the front through push rod through a transmission assembly. In this way, the forward pushing strokes of the front through push rod driven by the transmission assembly in the back-and-forth swinging process of the different protruding parts are different, the technical effect that the adjusting range is large is achieved, the cold header can be suitable for production of more products of different specifications, and the applicability of the cold header is improved.

Description

Technical Field

[0001] The utility model relates to the field of cold heading machines, in particular to a forward stroke regulating mechanism of a cold heading machine. Background Art

[0002] Cold heading machine is a highly efficient, automated professional machine tool, mainly used in forging machinery. Cold heading process is an important means for the standard parts industry to produce various bolts, screws, rivets, nuts and other parts. Cold heading machine can sequentially complete the processes of cutting, heading, accumulation, forming, chamfering, thread rolling, diameter reduction and trimming.

[0003] The forward stroke of the cold heading machine refers to the distance the mold moves forward during the cold heading process. This distance directly affects the size and shape of the product. The forward stroke of the cold heading machine can be precisely controlled by an adjustment device to ensure that the parts produced meet the design requirements.

[0004] China Invention Patent Authorization Announcement No. CN 212598633 The patent of U discloses an adjustable front-through drive mechanism of a cold heading machine, comprising a crank, wherein the crank is connected to one end of a main transmission arm, the other end of the main transmission arm is hinged to a main slide, a swing arm is hinged to the main slide, the swing arm has a first swing portion extending downward and a second swing portion extending rightward, the first swing portion can collide and contact with a front push rod, a roller is arranged on the second swing portion, a hinge portion is arranged on the main transmission arm, the hinge portion is hinged to one end of a connecting rod, the other end of the connecting rod is hinged to a swing block, the middle part of the swing block is hinged to a frame, an adjusting bolt is rotatably arranged on the swing block, a plane is arranged on the swing block, a sliding block is slidably arranged on the plane, the adjusting bolt is screwed to the sliding block, a convex rib is arranged on the sliding block, a strip groove for the convex rib to be inserted into is arranged on the plane, an arc section is arranged on the left side of the sliding block, and the left side of the sliding block can collide and contact with the roller. By controlling the adjusting bolt to drive the sliding block to slide, the length and starting time of the contact time between the sliding block and the roller within one rotation cycle of the crank can be adjusted. At the same time, according to the position of the sliding block, the contact time between its arc segment and the roller will also be different, thereby adjusting the swinging time and distance of the swing arm, and then adjusting the time and stroke of the front push rod, and facilitating the debugging of the equipment.

[0005] The adjustment device mainly adjusts the time and stroke of the front push rod by adjusting the arc section of the sliding block. The adjustment device of this structure can only be used to adjust products with a single small range of specifications. It has a small scope of application and is difficult to adapt to the cold heading processing of products with a large specification span. Utility Model Content

[0006] In order to solve the above problems, the purpose of the utility model is to provide a front-pass stroke adjustment mechanism of a cold heading machine with a large adjustment range, thereby improving the applicability of the cold heading machine.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a front stroke adjustment mechanism of a cold heading machine, comprising a frame, a crankshaft, a main connecting rod, a large connecting rod, a small connecting rod, a rotating shaft, a cam and a front push rod are installed on the frame, the cam is connected to the front push rod through a transmission assembly, the crankshaft drives the main connecting rod to swing back and forth, one end of the main connecting rod, the large connecting rod and one end of the small connecting rod are respectively rotatably installed on a central axis, so that the main connecting rod drives the large connecting rod to swing, the large connecting rod drives the small connecting rod to swing, the other end of the small connecting rod is connected to the rotating shaft, so that the small connecting rod drives the rotating shaft to be installed and rotated back and forth at a certain angle, the cam is rotatably installed on the rotating shaft, more than two protrusions are arranged on the peripheral wall of the cam, the protrusion height of each protrusion is different, and the protrusion of the cam is connected to the front push rod through the transmission assembly.

[0008] The protrusion is in the shape of a right-angled trapezoid and increases gradually according to a certain height.

[0009] The rotating shaft is also sleeved with an adjusting wheel, which is fixed on the rotating shaft through a tightening bolt. The cam is arranged between the adjusting wheels, and the adjusting wheel and the cam are engaged with each other through radial cogs that are evenly distributed around the circumference.

[0010] The peripheral wall of the regulating wheel is provided with toggle grooves evenly distributed around the circumference.

[0011] The circumferentially evenly distributed arc plates are respectively arranged on both sides of the peripheral wall of the adjusting wheel, the arc plates on both sides are staggered, the side edge of the arc plate on one side is connected to the end of the arc plate on the other side through the side plate, and the two side plates form the toggle groove.

[0012] The frame is provided with a guide hole for the front push rod to move, and the transmission assembly includes a rotating shaft, a first swing arm, a second swing arm and a return spring. The first swing arm and the second swing arm are respectively connected to the rotating shaft. A roller is provided at the end of the first swing arm, and the roller is close to the cam. The end of the second swing arm can collide with the front push rod. The return spring is installed in a spring groove on the frame, and a push plate is installed at the end of the return spring. The push plate contacts the bottom surface of the first swing arm under the action of the return spring.

[0013] The beneficial effect of the utility model is that since the cam is rotatably adjusted and installed on the rotating shaft, and the protrusion heights of each protrusion on the peripheral wall of the cam are different, the different protrusions drive the front push rod to push forward with different strokes through the transmission component during the reciprocating swing, thereby achieving a technical effect of a large adjustment range, so that the cold heading machine can be adapted to the production of more products of different specifications, thereby improving the applicability of the cold heading machine.

[0014] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of a specific implementation of the utility model;

[0016] Figure 2 It is a cutaway view of a specific implementation mode of the utility model;

[0017] Figure 3 It is a three-dimensional diagram of a cam in a specific implementation mode of the utility model;

[0018] Figure 4 It is a stereoscopic view of the adjusting wheel in a specific implementation manner of the utility model.

[0019] In the figure, 1 is a frame; 2 is a crankshaft; 3 is a main connecting rod; 30 is a large connecting rod; 4 is a small connecting rod; 5 is a rotating shaft; 6 is a cam; 61 is a raised portion; 7 is a front push rod; 8 is a transmission assembly; 9 is an adjusting wheel; 91 is a toggle groove; 92 is an arc plate; 10 is a cog; 81 is a rotating shaft; 82 is a first swing arm; 83 is a second swing arm; 84 is a return spring; 20 is a roller; and 40 is a push plate. DETAILED DESCRIPTION

[0020] The present invention is specifically described below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the protection scope of the present invention.

[0021] like Figure 1 , Figure 2 As shown, this embodiment discloses a front stroke adjustment mechanism of a cold heading machine, including a frame 1, on which a crankshaft 2 (not shown in the figure, the position shown is its installation position), a main connecting rod 3, a large connecting rod 30, a small connecting rod 4, a rotating shaft 5, a cam 6 and a front push rod 7 are installed. The cam 6 is connected to the front push rod 7 through a transmission assembly 8. The crankshaft 2 drives the main connecting rod 3 to swing back and forth. One end of the main connecting rod 3, the large connecting rod 30 and one end of the small connecting rod 4 are respectively rotatably installed on a central axis, so that the main connecting rod drives the large connecting rod to swing. The large connecting rod drives the small connecting rod to swing, and the other end of the small connecting rod is connected to the rotating shaft 5. In this way, the small connecting rod drives the rotating shaft 5 to rotate back and forth at a certain angle. The cam 6 is rotatably adjusted and installed on the rotating shaft 5. Three protrusions 61 are arranged on the peripheral wall of the cam 6. The protrusion height of each protrusion 61 is different. The protrusion 61 of the cam 6 is connected to the front push rod 7 through the transmission assembly 8. In this way, the three protrusions 61 enable the front push rod 7 to have short stroke, medium stroke and long stroke adjustment, so as to adapt to the cold heading needs of different products.

[0022] like Figure 3As shown, the protrusions 61 are evenly distributed on the peripheral wall of the cam 6, and each protrusion 61 is in the shape of a right-angled trapezoid and gradually increases in height according to a certain height, so that different protrusions 61 can be adjusted and used according to different products.

[0023] An adjusting wheel 9 is also sleeved on the rotating shaft 5, and the adjusting wheel 9 is fixed on the rotating shaft 5 by a tension bolt. The cam 6 is arranged between the adjusting wheels 9. The adjusting wheel 9 and the cam 6 are engaged with each other through radial and circumferentially uniformly distributed cogs 10. At the same time, the adjusting wheel 9 is connected to the cam 6 by bolts passing through the adjusting wheel 9, so as to ensure that the engagement of the cogs 10 is more reliable. At the same time, the cam position can also be independently adjusted by the bolt. When the cam 6 is adjusted to rotate, the adjusting wheel 9 is loosened by the tension bolt, so that the adjusting wheel 9 can be manually rotated, so that the cam 6 can be driven to rotate and adjust. After the adjustment is completed, the tension bolt is tightened to fix the adjusting wheel 9, and then the pushing time of the front push rod 7 is fine-tuned.

[0024] like Figure 4 As shown, the adjusting wheel 9 has a wider adjusting wheel and a narrower adjusting wheel, and the peripheral walls of the two adjusting wheels 9 are provided with circumferentially uniformly distributed toggle grooves 91. Through this structure, the rotating operation of the adjusting wheel 9 can be more convenient by tools or direct manual operation.

[0025] In one of the wider adjusting wheels, arc plates 92 are evenly distributed around the circumference on both sides of the peripheral wall of the adjusting wheel 9, the arc plates 92 on both sides are staggered, the side of the arc plate 92 on one side is connected to the end of the arc plate 92 on the other side through the side plate, and the two side plates form a toggle groove 91. The toggle groove 91 formed in this way has a more reliable structure, and a through hole for the bolt to pass through is provided on the toggle plate 92, while the toggle plates on the narrower adjusting wheel 9 are also evenly distributed around the circumference, and a toggle groove 91 is also formed between the arc plates, and a through hole for the bolt to pass through is also provided on the arc plate.

[0026] The frame 1 is provided with a guide hole for the front push rod 7 to move, and the transmission assembly 8 includes a rotating shaft 81, a first swing arm 82, a second swing arm 83 and a return spring 84. The first swing arm 82 and the second swing arm 83 are respectively connected to the rotating shaft 81. The end of the first swing arm 82 is provided with a roller 20, and the roller 20 is close to the cam 6. When the protrusion 61 on the cam 6 swings, it contacts the roller 20, thereby driving the first swing arm 82 to swing. After the first swing arm 82 swings, it is transmitted to the second swing arm through the rotating shaft 81. The second swing arm 83 and the first swing arm 82 are swung synchronously on the swing arm 83, so that the end of the second swing arm 83 can collide with the front push rod 7 to push the front push rod 7 forward. The return spring 84 is installed in the spring groove on the frame 1, and a push plate 40 is installed at the end of the return spring 84. The push plate 40 contacts the bottom surface of the first swing arm 82 under the action of the return spring 84. This structure has high transmission efficiency. When the cam 6 is reset, the first swing arm 82 can also be reset in time under the action of the return spring 84.

[0027] By adopting the above technical scheme, since the cam 6 is rotatably adjusted and installed on the rotating shaft 5, and the protrusion heights of each protrusion 61 on the peripheral wall of the cam 6 are different, the different protrusions 61 drive the front push rod 7 to push forward through the transmission assembly 8 during the reciprocating swing to have different strokes, thereby achieving a technical effect of a large adjustment range, so that the cold heading machine can be adapted to the production of more products of different specifications, thereby improving the applicability of the cold heading machine.

[0028] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A front stroke adjustment mechanism of a cold heading machine, comprising a frame, a crankshaft, a main connecting rod, a large connecting rod, a small connecting rod, a rotating shaft, a cam and a front push rod are installed on the frame, the cam is connected to the front push rod through a transmission assembly, the crankshaft drives the main connecting rod to swing back and forth, one end of the main connecting rod, the large connecting rod and one end of the small connecting rod are respectively rotatably installed on a central axis, the main connecting rod drives the large connecting rod to swing, the large connecting rod drives the small connecting rod to swing, the other end of the small connecting rod is connected to the rotating shaft, and the small connecting rod drives the rotating shaft to rotate back and forth at a certain angle, characterized in that: The cam is rotatably and adjustably mounted on the rotating shaft. More than two protrusions are arranged on the peripheral wall of the cam. The protrusion height of each protrusion is different. The protrusion of the cam is connected to the front push rod through a transmission component.

2. The front stroke adjustment mechanism of the cold heading machine according to claim 1, characterized in that: The protrusion is in the shape of a right-angled trapezoid and increases gradually according to a certain height.

3. The front stroke adjustment mechanism of the cold heading machine according to claim 1, characterized in that: The rotating shaft is also sleeved with an adjusting wheel, which is fixed on the rotating shaft through a tightening bolt. The cam is arranged between the adjusting wheels, and the adjusting wheel and the cam are engaged with each other through radial cogs that are evenly distributed around the circumference.

4. The front stroke adjustment mechanism of the cold heading machine according to claim 3, characterized in that: The peripheral wall of the regulating wheel is provided with toggle grooves evenly distributed around the circumference.

5. The front stroke adjustment mechanism of the cold heading machine according to claim 4, characterized in that: The circumferentially evenly distributed arc plates are respectively arranged on both sides of the peripheral wall of the adjusting wheel, the arc plates on both sides are staggered, the side edge of the arc plate on one side is connected to the end of the arc plate on the other side through the side plate, and the two side plates form the toggle groove.

6. The front stroke adjustment mechanism of the cold heading machine according to claim 1, characterized in that: The frame is provided with a guide hole for the front push rod to move, and the transmission assembly includes a rotating shaft, a first swing arm, a second swing arm and a return spring. The first swing arm and the second swing arm are respectively connected to the rotating shaft. A roller is provided at the end of the first swing arm, and the roller is close to the cam. The end of the second swing arm can collide with the front push rod. The return spring is installed in a spring groove on the frame, and a push plate is installed at the end of the return spring. The push plate contacts the bottom surface of the first swing arm under the action of the return spring.

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