Front through stroke adjusting device of cold header

Abstract

The front through stroke adjusting device comprises a rack, a crankshaft, a main connecting rod, a large connecting rod, a small connecting rod, a rotating shaft, a cam and a front through push rod are installed on the rack, the cam is in transmission connection with the front through push rod through a transmission assembly, the crankshaft drives the main connecting rod to swing back and forth, the main connecting rod drives the large connecting rod to swing, and 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, more than two protruding parts are arranged on the peripheral wall of the cam, the protruding heights of the protruding parts are different, and the protruding parts of the cam are 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 invention relates to the field of cold heading machines, and in particular to a forward stroke regulating device for cold heading machines. 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.

[0006] At the same time, the punch of the cold heading machine is a key component of hammering. It will deviate or wear under long-term hammering, resulting in the punch position not being able to accurately hammer the mold. Inaccurate punch position will cause parts and unloading to be abnormal. The processed products may be inaccurate in size or even have defects such as cracks. Therefore, the position of the punch is related to the quality of the product. Summary of the invention

[0007] In order to solve the above problems, the object of the present invention is to provide a front-through stroke adjustment device for a cold heading machine with a large front-through push rod stroke adjustment range, thereby improving the applicability of the cold heading machine.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a front stroke adjustment device 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 and one end of the large connecting rod are respectively rotatably installed on a central axis, so that the main connecting rod drives the large connecting rod to swing, and 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, 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, and more than two protrusions are arranged on the peripheral wall of the cam, and 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.

[0009] The protrusion is in the shape of a right-angled trapezoid and increases gradually according to a certain height. A punch is installed at the end of the front push rod, and the position of the punch is adjustable.

[0010] A die seat for telescopic movement is provided corresponding to the punch, and a front side plate is installed on the frame, and an "L"-shaped hanging plate is connected to the upper end of the front side plate, and a hanging groove is provided on the hanging plate, and an adjustment plate that can move up and down along the front end surface of the front side plate is provided, and a Z-direction adjusting screw is provided at the upper end of the adjusting plate, and the Z-direction adjusting screw is adjustably hung on the hanging groove through a washer and a nut, and the die seat is connected to the adjusting plate, and the adjusting plate and the front side plate are respectively provided with guide holes for the punch to pass through, and the upper and lower ends of the die seat are respectively provided with through holes, and sleeves are provided in the through holes, and a fixing bolt passes through the sleeve and is connected to the adjusting plate, and a gap is left between the sleeve and the through hole of the die seat, and the sleeve is fixedly sleeved on the fixing bolt, and horizontally placed X-direction adjusting screws are respectively screwed on both sides of the die seat, and the ends of the two X-direction adjusting screws are respectively inserted into the through holes and abut against the sleeve, so that the die seat can be adjusted up, down, left and right.

[0011] 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.

[0012] The peripheral wall of the regulating wheel is provided with toggle grooves evenly distributed around the circumference.

[0013] 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.

[0014] 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.

[0015] The beneficial effect of the present invention 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 to different strokes through the transmission assembly during the reciprocating swing, thereby achieving the technical effect of a large adjustment range of the stroke of the front push rod, 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.

[0016] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of a specific embodiment of the present invention; Figure 2 A cutaway view of a specific embodiment of the present invention; Figure 3 It is a three-dimensional diagram of a cam in a specific embodiment of the present invention; Figure 4 A three-dimensional diagram of an adjustment wheel in a specific embodiment of the present invention; Figure 5 It is a partial structural stereogram of a specific implementation method of the present invention.

[0018] 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 part; 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; 30 is a push plate; 12 is a punch; 14 is a die seat; 15 is a front side plate; 151 is a hanging plate; 16 is an adjusting plate; 17 is a Z-direction adjusting screw; 18 is a X-direction adjusting screw; 110 is a sleeve; 20 is a fixing bolt. DETAILED DESCRIPTION

[0019] The present invention is specifically described below through examples, which are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention.

[0020] like Figure 1 , Figure 2 As shown, this embodiment discloses a front stroke adjustment device 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, and 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 5, so that 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. The three protrusions 61 make the front push rod 7 have short stroke, medium stroke and long stroke adjustment, so as to adapt to the cold heading needs of different products. A punch is installed at the end of the front push rod 7, and the position of the punch is adjustable.

[0021] Specific as Figure 5 As shown, the position adjustment method of the punch is as follows: a punch seat 14 is provided corresponding to the punch 12, and a guide hole for the punch 12 to move is provided in the die seat 14, a front side plate 15 is installed on the frame, and an "L"-shaped hanging plate 151 is connected to the upper end of the front side plate 15, and a hanging groove is provided on the hanging plate 151, and an adjustment plate 16 that moves up and down along the front end surface of the front side plate 15 is provided, and a Z-direction adjustment screw 17 is provided at the upper end of the adjustment plate 16, and the Z-direction adjustment screw 17 is adjustably hung on the hanging groove through a washer and a nut, and the die seat 14 is connected to the adjustment plate 16, and guide holes for the punch 12 to pass through are respectively provided on the adjustment plate 16 and the front side plate 15, and the upper and lower ends of the die seat 14 are respectively provided with A sleeve 110 is arranged in the perforation, and a fixing bolt passes through the sleeve 110 and is connected to the adjustment plate 16. A gap is left between the sleeve 110 and the perforation of the die seat 14, and the sleeve 110 is fixedly sleeved on the fixing bolt. Horizontally placed X-direction adjusting screws 18 are respectively screwed on both sides of the die seat 14, and the ends of the two X-direction adjusting screws 18 are respectively inserted into the perforations and abut against the sleeve 110, so that the die seat 14 can be adjusted up and down and left and right, and the punch is placed in the guide hole in the die seat 14 for telescopic movement, so as to achieve the technical effect that the position of the punch 12 can be adjusted conveniently and reliably, ensuring that the position of the punch 2 can accurately hammer the mold, thereby greatly improving work efficiency and product quality.

[0022] like Figure 3 As 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 cog 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. Rotating the adjusting wheel 9 can drive the cog 10 to rotate and drive the cam 6 to fine-tune at the same time, thereby fine-tuning the pushing time of the front push rod 7.

[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 arc plate 92, and the arc 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 30 is installed at the end of the return spring 84. The push plate 30 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 the technical effect of a large adjustment range of the front push rod stroke, 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, and the adjustable position of the punch can ensure the precise hammering of the punch, and is easy to operate, thereby greatly improving the quality of the product.

[0028] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. 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 device for 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 and one end of the large 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 a 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 assembly. The protrusion is in a right-angle trapezoidal shape and gradually increases according to a certain height. A punch is installed at the end of the front push rod, and the position of the punch is adjustable.

2. The forward stroke adjustment device of the cold heading machine according to claim 1, characterized in that: A die seat for telescopic movement is provided corresponding to the punch, and a front side plate is installed on the frame, and an "L"-shaped hanging plate is connected to the upper end of the front side plate, and a hanging groove is provided on the hanging plate, and an adjustment plate that can move up and down along the front end surface of the front side plate is provided, and a Z-direction adjusting screw is provided at the upper end of the adjusting plate, and the Z-direction adjusting screw is adjustably hung on the hanging groove through a washer and a nut, and the die seat is connected to the adjusting plate, and the adjusting plate and the front side plate are respectively provided with guide holes for the punch to pass through, and the upper and lower ends of the die seat are respectively provided with through holes, and sleeves are provided in the through holes, and a fixing bolt passes through the sleeve and is connected to the adjusting plate, and a gap is left between the sleeve and the through hole of the die seat, and the sleeve is fixedly sleeved on the fixing bolt, and horizontally placed X-direction adjusting screws are respectively screwed on both sides of the die seat, and the ends of the two X-direction adjusting screws are respectively inserted into the through holes and abut against the sleeves, so that the die seat can be adjusted up, down, left and right.

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

5. The forward stroke adjustment device 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 forward stroke adjustment device 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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