Movable mold lifting device

Abstract

The movable mold lifting device comprises a lathe bed, a sliding table, a lifting seat, a transmission plate, a swing device and a transmission rod, a transverse shaft and a bell hammer shaft are rotationally connected to the lathe bed, and a lifting cam is fixedly arranged at one end of the transverse shaft; the sliding table is horizontally and slidably connected with the lathe bed; the lifting seat is in vertical sliding connection with the sliding table; the lifting cam drives the transmission plate to do reciprocating translation through the reciprocating movement assembly; the swing device comprises an upper clock hammer arm and a lower clock hammer arm, and the two sides of the upper clock hammer arm and the two sides of the lower clock hammer arm are connected through buffer assemblies respectively. The lower clock hammer arm is rotationally connected with one end, far away from the lifting cam, of the transmission plate; the reciprocating translation transmission plate drives the lower clock hammer arm to do reciprocating swing around the axis of the clock hammer shaft; one end of the transmission rod is fixedly arranged in the middle of the bell hammer shaft, and the other end of the transmission rod is rotationally connected with a sliding block which is horizontally and slidably connected with the bottom of the lifting seat. The device can effectively buffer the impact and vibration generated when the lifting seat moves in place, effectively reduce the shaking of the lifting seat, and ensure the matching precision of the movable mold and the fixed mold.

Description

Technical Field

[0001] This invention relates to the field of cold heading machine technology, and in particular to a moving mold lifting device. Background Technology

[0002] In the multi-station stamping process of cold heading machine, multiple moving dies located at the front end of the slide table are driven by the moving die lifting device to move up and down reciprocally. Each moving die cooperates with the fixed die at the corresponding position to complete the step-by-step or multiple processing operations of the workpiece.

[0003] Specific application scenarios include two typical processes: one is a two-stroke process with one die, where the moving die works with the fixed die at the same position to complete two stamping actions during the lifting and lowering process; the other is a multi-die multi-stroke process, where multiple moving dies can be aligned with multiple vertically arranged fixed dies by moving vertically once. Each moving die completes a single stamping with its corresponding fixed die after moving, and finally achieves multi-process processing of the workpiece in a single lifting and lowering cycle. This is suitable for workpieces with special structures that are difficult to move by grippers, and can reduce the risk of damage during workpiece transfer and improve processing stability.

[0004] To avoid rigid collisions between the lifting seat and the limiting components when the lifting seat reaches the preset position, existing mold lifting devices typically incorporate a buffer structure. For example, Chinese Patent Publication No. CN101722271B discloses a two-die three-punch upsetting machine and its working method. This device includes a lifting drive plate, a lifting slider, a return spring, and an outer swing component. The elasticity of the return spring buffers the impact force generated when the lifting plate reaches the preset position. However, this buffer structure relies solely on a single spring for its buffering function. During operation, the lifting plate faces buffering demands at both the top dead center and the bottom dead center. Adjusting the spring force of a single spring to accommodate these two buffering requirements necessitates repeated adjustments, making the process extremely cumbersome. Furthermore, the lifting drive plate is hidden inside the gears, requiring the removal of external structures such as the gears to access the drive plate during maintenance, further complicating the repair process.

[0005] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a moving mold lifting device to solve the above problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A moving mold lifting device, comprising: The bed has a horizontal axis and a bell hammer axis that are rotatably connected to it, and a lifting cam is fixed at one end of the horizontal axis. The slide table is horizontally connected to the bed. The lifting seat is vertically slidably connected to the slide table, and the front end of the lifting seat is provided with several moving molds; The transmission plate and the lifting cam drive the transmission plate to reciprocate translation via a reciprocating motion component; The swinging device includes an upper bell hammer arm fixed on the bell hammer shaft and a lower bell hammer arm rotatably connected to the bell hammer shaft. The two sides of the upper bell hammer arm and the lower bell hammer arm are respectively connected by a buffer assembly. The lower bell hammer arm is rotatably connected to the end of the transmission plate away from the lifting cam. The reciprocating transmission plate drives the lower bell hammer arm to swing back and forth around the axis of the bell hammer shaft. At least one transmission rod, one end of which is fixed to the middle of the bell hammer shaft, and the other end of which is rotatably connected to a slider, which is horizontally slidably connected to the bottom of the lifting seat.

[0008] Furthermore, it also includes an upper limit assembly installed on the top of the slide table and a lower limit assembly installed on the top of the lifting seat; the upper limit assembly abuts against the top of the lifting seat to limit the highest position of movement of the lifting seat; the lower limit assembly abuts against the slide table to limit the lowest position of movement of the lifting seat.

[0009] Furthermore, the reciprocating moving assembly includes a guide block rotatably connected to the end of the horizontal shaft, and the transmission plate has an installation groove extending along its length direction. The guide block is embedded in the installation groove and slidably connected to the installation groove. Rollers are rotatably connected to both sides of the transmission plate located in the installation groove, and the two rollers slide along the two corresponding arc surfaces of the lifting cam respectively.

[0010] Furthermore, the guide block includes a T-shaped block and a cover plate. The T-shaped block and the cover plate are connected to form two guide grooves arranged vertically. The two guide grooves are slidably connected to the mounting grooves respectively. The T-shaped block has a through hole extending to the cover plate, and the through hole is rotatably connected to the horizontal shaft.

[0011] Furthermore, the ends of the horizontal axis and the bell hammer axis extend outside the bed, the lifting cam and the guide block are both located outside the bed, and the guide block is located on the side of the lifting cam away from the bed.

[0012] Furthermore, the buffer assembly includes a first screw, a buffer spring, and an adjusting nut. The first screw passes through the lower bell hammer arm and the upper bell hammer arm in sequence and is screwed to the adjusting nut. The buffer spring is sleeved on the first screw, and its two ends abut against the upper bell hammer arm and the adjusting nut, respectively.

[0013] Furthermore, the lower bell hammer arm is provided with an adjustment column that can be adjusted in the vertical direction, and the adjustment column is rotatably connected to the end of the transmission plate away from the lifting cam.

[0014] Furthermore, the lower bell hammer arm has an adjustment groove extending vertically, and the adjustment column includes a sliding part and a rotating part. The sliding part is slidably connected to the adjustment groove, and a second screw is rotatably connected inside the adjustment groove. The second screw is screwed to the sliding part; the rotating part is rotatably connected to the transmission plate.

[0015] Furthermore, a counterweight assembly is provided at the end of the bell hammer shaft away from the upper bell hammer arm, the counterweight assembly being used to balance the bell hammer shaft.

[0016] Furthermore, the bottom of the lifting seat is provided with a horizontally placed I-shaped slide rail, and there are two transmission rods and two sliders. The end of one transmission rod is rotatably connected to one slider through a short shaft, and one slider is slidably connected to one side of the slide rail.

[0017] Beneficial effects: The present invention provides a moving mold lifting device, which has the following beneficial effects: (1) The swing device uses two buffer components to connect the upper bell hammer arm and the lower bell hammer arm; when the lifting seat moves to the highest or lowest position, the buffer components can effectively absorb the impact and vibration during the transmission process, and the two buffer components can press the lifting seat in the upward and downward directions respectively, reduce the shaking of the lifting seat, avoid the moving mold from shifting position due to vibration, thereby ensuring the positioning accuracy of the moving mold and improving the consistency of workpiece processing quality; (2) The lifting cam, reciprocating moving component, swing device and transmission plate are arranged synchronously on the outside of the bed, without the obstruction of the bed structure; the operator can directly adjust the swing device and transmission plate, and at the same time facilitate the disassembly and maintenance of vulnerable parts, greatly simplifying the operation process. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the moving mold lifting device provided by the present invention; Figure 2 This is a partial structural diagram of the moving mold lifting device provided by the present invention; Figure 3 This is a front sectional view of the structural diagram of the moving mold lifting device provided by the present invention; Figure 4 This is a structural diagram of the upper and lower limit components in the moving mold lifting device provided by the present invention; Figure 5 An exploded view of the moving mold lifting device provided by the present invention; Figure 6 This is a cross-sectional view of the swing device in the moving mold lifting device provided by the present invention; Figure 7 This is a cross-sectional view of the reciprocating moving component in the moving mold lifting device provided by the present invention.

[0019] Reference numerals: Bed 1, Guide seat 11, Horizontal shaft 2, Lifting cam 21, End cover 22, Bell hammer shaft 3, Cantilever 31, Slide table 4, Upper limit assembly 41, First limit screw 411, Limit nut 412, Lower limit assembly 42, Lifting seat 5, Moving mold 51, Slide rail 52, Limit block 53, Transmission plate 6, Mounting groove 61, Oil guide channel 62, Reciprocating movement assembly 7, Guide block 71, T-block 711, Cover plate 71 2. Guide groove 713, through hole 714, oil groove group 715, roller 72, swing device 8, upper bell hammer arm 81, mounting cavity 811, lower bell hammer arm 82, adjusting groove 821, buffer assembly 83, first screw 831, buffer spring 832, adjusting nut 833, washer 834, adjusting column 84, sliding part 841, rotating part 842, second screw 85, transmission rod 9, slider 91, short shaft 92, fixed mold 10. Detailed Implementation

[0020] This invention provides a moving mold lifting device. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0021] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0022] In this invention, "front" refers to the direction in which the moving mold moves towards the fixed mold, and "rear" is the opposite direction to "front".

[0023] Please see Figures 1 to 7As shown, the present invention provides a moving mold lifting device, including a bed 1, a slide 4, a lifting seat 5, a transmission plate 6, a swing device 8, and at least one transmission rod 9; a horizontal shaft 2 and a bell hammer shaft 3 are rotatably connected on the bed 1, and a lifting cam 21 is fixedly provided at one end of the horizontal shaft 2; the slide 4 is horizontally slidably connected to the bed 1; the lifting seat 5 is vertically slidably connected to the slide 4, and a plurality of moving molds 51 are provided at the front end of the lifting seat 5; the plurality of moving molds 51 are arranged sequentially at the front end of the lifting seat 5 in a vertical direction; in this embodiment, three moving molds 51 are provided, and two fixed molds 10 corresponding to the moving molds 51 are provided to adapt to the cold heading process of two molds and three punches; wherein, the upper moving mold 51 cooperates with the upper fixed mold 10 to perform a first punch on the bar stock; the middle moving mold 51 is used to transfer the workpiece after the first punch to the lower fixed mold 10; the lower moving mold 51 cooperates with the lower fixed mold 10 to perform a second punch on the workpiece after the first punch.

[0024] The transmission plate 6 is movably connected to the lifting cam 21. The lifting cam 21 drives the transmission plate 6 to reciprocate and translate through the reciprocating moving component 7. The swinging device 8 includes an upper bell hammer arm 81 fixed on the bell hammer shaft 3 and a lower bell hammer arm 82 rotatably connected to the bell hammer shaft 3. The two sides of the upper bell hammer arm 81 and the lower bell hammer arm 82 are respectively connected through the buffer component 83. The lower bell hammer arm 82 is rotatably connected to the end of the transmission plate 6 away from the lifting cam 21. The reciprocatingly translating transmission plate 6 drives the lower bell hammer arm 82 to reciprocate and swing around the axis of the bell hammer shaft 3. One end of each transmission rod 9 is fixed in the middle of the bell hammer shaft 3, and the other end is rotatably connected to a slider 91. The slider 91 is horizontally slidably connected to the bottom of the lifting seat 5.

[0025] During operation, the upper moving die 51 first works with the upper fixed die 10 to stamp the bar stock once. Simultaneously, the middle moving die 51 transfers the workpiece stamped once in the previous round to the lower fixed die 10. Then, the slide table 4 retracts and moves forward, the horizontal shaft 2 drives the lifting cam 21 to rotate, and the reciprocating moving assembly 7 drives the transmission plate 6 to move forward, thereby causing the lower bell hammer arm 82 to swing forward at an angle around the axis of the bell hammer shaft 3. The lower bell hammer arm 82 drives the upper bell hammer arm 81 to swing forward synchronously through two buffer assemblies 83. The bell hammer shaft 3 then rotates clockwise around its own axis. Finally, through the sliding and rotating cooperation between the transmission rod 9 and the lifting seat 5, the lifting seat 5 is raised by a distance between the two moving dies 51, so that the middle moving die 51 moves to the upper fixed die 10. At this time, the workpiece that has just completed one stamping in the upper fixed die 10 is transferred to the middle moving die 51. At the same time, the lower moving die 51 works with the lower fixed die 10 to complete a second stamping of the workpiece that was previously transferred to the lower fixed die 10.

[0026] Next, the slide table 4 retracts and moves forward again. The workpiece after the second stamping is ejected by the ejector pin in the lower fixed mold 10 or the lower moving mold 51. The lifting cam 21 drives the transmission plate 6 to move backward through the reciprocating moving component 7, causing the lower bell hammer arm 82 to swing backward at an angle around the axis of the bell hammer shaft 3. The lower bell hammer arm 82 drives the upper bell hammer arm 81 to swing backward synchronously through the two buffer components 83. The bell hammer shaft 3 then rotates counterclockwise around its own axis. Finally, through the sliding and rotating cooperation between the transmission rod 9 and the lifting seat 5, the lifting seat 5 is moved down by the distance between the two moving molds 51, so that the upper moving mold 51 returns to the upper fixed mold 10 and the middle moving mold 51 moves to the lower fixed mold 10, preparing for the next round of bar stamping.

[0027] This device connects the upper bell hammer arm 81 and the lower bell hammer arm 82 by setting two buffer components 83 on the swing device 8. When the lifting seat 5 moves to the designated position, it can effectively buffer the impact and vibration. The two buffer components 83 can press the lifting seat 5 in the upward and downward directions respectively, reducing the shaking of the lifting seat 5 and preventing the moving mold 51 from shifting due to vibration, thereby ensuring the positioning accuracy of the moving mold 51 and improving the consistency of workpiece processing quality. At the same time, with the help of the multi-stage transmission structure of the lifting cam 21, transmission plate 6, swing device 8 and transmission rod 9, the rotational motion of the horizontal shaft 2 can be stably converted into the vertical motion of the lifting seat 5. The transmission path is clear and the power transmission loss is small, which can ensure the synchronization of the movement of the moving mold 51 and the fixed mold 10. The overall transmission is efficient and reliable.

[0028] It should be noted that the cold heading machine is equipped with a drive unit, which drives the horizontal shaft 2 to rotate and the slide table 4 to move back and forth to achieve continuous stamping. The drive unit is prior art and is not within the scope of protection claimed in this invention; its specific structure and working principle will not be described in detail.

[0029] In actual cold heading processes, the core function of the moving die 51 and the fixed die 10 is to cooperate in completing the stamping and transfer of the workpiece. Their basic working principle and the structural design of the moving die 51, which transfers the workpiece stamped once in the upper fixed die 10 to the lower fixed die 10, are widely used in multi-station cold heading equipment in the industry and are considered prior art. Furthermore, the specific structure of the moving die 51 and the fixed die 10 is specifically designed according to the specifications of the workpiece and the stamping process requirements. Those skilled in the art can complete this design based on existing mold design knowledge. Therefore, the specific structure of the moving die 51 and the fixed die 10 is not within the scope of protection claimed in this invention.

[0030] In a preferred embodiment, see [reference] Figure 4It also includes an upper limit assembly 41 installed on the top of the slide table 4 and a lower limit assembly 42 installed on the top of the lifting seat 5. The upper limit assembly 41 abuts against the top of the lifting seat 5 to limit the highest position of movement of the lifting seat 5. Specifically, the top of the lifting seat 5 is provided with a limiting block 53 located above the slide table 4. The upper limit assembly 41 includes a first limiting screw 411 located on the top of the slide table 4 and a limiting nut 412 screwed to the first limiting screw 411. The limiting block 53 is slidably connected to the first limiting screw 411. When the lifting seat 5 moves upward, the limiting block 53 will move upward synchronously with the lifting seat 5 until it abuts against the limiting nut 412, at which point the lifting seat 5 reaches its highest position. By rotating and adjusting the upper and lower positions of the limiting nut 412 on the first limiting screw 411, the highest position of movement of the lifting seat 5 can be flexibly changed.

[0031] The lower limit component 42 abuts against the slide table 4 to limit the lowest movement position of the lifting seat 5. Specifically, the lower limit component 42 includes a second limit screw screwed to the limit block 53. When the lifting seat 5 moves downward, the second limit screw moves downward synchronously with the lifting seat 5 until its bottom abuts against the top of the slide table 4, at which point the lifting seat 5 reaches its lowest movement position. By rotating and adjusting the upper and lower installation positions of the second limit screw on the limit block 53, the lowest movement position of the lifting seat 5 can be flexibly changed. Through the setting of the above-mentioned limit component, the upper and lower movement limit positions of the lifting seat 5 can be flexibly adjusted according to actual processing requirements, ensuring that after the moving mold 51 completes the upper and lower movement with the lifting seat 5, it can accurately maintain coaxiality with the corresponding fixed mold 10, thus ensuring stamping accuracy. It should also be noted that the contact between the limiting block 53 and the limiting nut 412 of the upper limit component 41, and the second limiting screw of the lower limit component 42 and the slide table 4, are all rigid collisions. Since the upper bell hammer arm 81 and the lower bell hammer arm 82 in this device are connected by the buffer component 83, even if the lifting seat 5 has reached the highest or lowest position, and the transmission plate 6 has not yet completed the translation stroke, the two buffer components 83 can effectively buffer the impact and vibration generated in the process, avoid the device shaking caused by rigid collision, and further ensure the stability of operation.

[0032] In a preferred embodiment, see [reference] Figure 2 , 5The reciprocating moving assembly 7 includes a guide block 71 rotatably connected to the end of the horizontal shaft 2. The transmission plate 6 has a mounting groove 61 extending along its length. The guide block 71 is embedded in the mounting groove 61 and slidably connected to it, thus guiding and limiting the movement of the transmission plate 6. Rollers 72 are rotatably connected to both sides of the transmission plate 6 located in the mounting groove 61. The two rollers 72 slide along two corresponding arc surfaces of the lifting cam 21. Specifically, the lifting cam 21 adopts a constant-diameter cam structure. The centers of the two rollers 72 are on the same straight line as the center of the horizontal shaft 2. When the two rollers 72 slide synchronously along the arc surface of the lifting cam 21, the distance between them remains constant, ensuring the stability of the transmission process. When the lifting cam 21 rotates one revolution with the horizontal shaft 2, its arc surface, through contact with the two rollers 72, drives the transmission plate 6 to complete one reciprocating translation along its length.

[0033] Preferably, see Figure 1 To further ensure the stability of the reciprocating translation of the transmission plate 6, a guide seat 11 is fixed on the bed 1; the transmission plate 6 passes through the interior of the guide seat 11 and is slidably connected to the guide seat 11 to ensure that the transmission plate 6 always slides smoothly along its length extension direction and avoids vertical deviation.

[0034] Further, see Figure 5 , 7 The guide block 71 includes a T-shaped block 711 and a cover plate 712. The T-shaped block 711 and the cover plate 712 are connected to form two vertically arranged guide grooves 713. The two guide grooves 713 are slidably connected to the upper and lower sides of the mounting groove 61, respectively. The T-shaped block 711 has a through hole 714 extending to the cover plate 712. The through hole 714 is rotatably connected to the horizontal shaft 2, so that the guide block 71 and the horizontal shaft 2 can rotate relative to each other.

[0035] To ensure smooth horizontal sliding between the guide block 71 and the transmission plate 6, as well as smooth rotation between the guide block 71 and the horizontal shaft 2, the reciprocating moving assembly 7 is also equipped with a lubrication structure. The transmission plate 6 has two cross-shaped oil guide channels 62, which are located above and below the mounting groove 61, respectively, to facilitate the even delivery of lubricating oil to the periphery of the mounting groove 61. Correspondingly, the inner walls of the two guide grooves 713 of the guide block 71 and the inner wall of the through hole 714 are provided with oil groove groups 715, and the oil groove groups 715 at the guide grooves 713 and the oil groove groups 715 at the through hole 714 are interconnected through the vertical holes opened in the T-shaped block 711. In use, lubricating oil can enter the oil groove group 715 of the guide block 71 guide groove 713 through the cross-shaped oil guide channel 62 of the transmission plate 6, lubricating the horizontal sliding contact surface between the guide groove 713 and the mounting groove 61; at the same time, some lubricating oil can flow into the oil groove group 715 of the through hole 714 through the vertical hole, lubricating the rotational contact surface between the through hole 714 and the horizontal shaft 2, thereby achieving synchronous lubrication of the contact surfaces of the relative sliding between the guide block 71 and the transmission plate 6, and the relative rotation between the guide block 71 and the horizontal shaft 2, reducing friction loss and extending the service life of the components.

[0036] In a preferred embodiment, see [reference] Figure 1 , 2 The ends of the horizontal shaft 2 and the bell hammer shaft 3 extend outside the bed 1. The lifting cam 21 and the guide block 71 are both located outside the bed 1, with the guide block 71 located on the side of the lifting cam 21 away from the bed 1. Specifically, the lifting cam 21 is fixed to the end of the horizontal shaft 2, and the guide block 71 is sleeved on the end of the horizontal shaft 2 through its own through hole 714. To restrict the axial movement of the guide block 71, an end cap 22 is also fixed to the end face of the horizontal shaft 2. At this time, both sides of the guide block 71 are in contact with the end cap 22 and the lifting cam 21, respectively, to ensure that the guide block 71 will not move axially when it rotates relative to the horizontal shaft 2. More importantly, since the guide block 71 is installed entirely outside the bed 1 and located outside the lifting cam 21, the transmission rod 9 and the swing device 8, which have a motion transmission relationship with it, are also arranged synchronously outside the bed 1. The above-mentioned design greatly improves the ease of adjustment and maintenance of the device. On the one hand, operators can directly adjust the swing device 8 and the transmission plate 6 without disassembling the internal structure of the bed 1. On the other hand, it makes the replacement of easily damaged parts such as rollers 72 more convenient. During disassembly and assembly, it is only necessary to first remove the end cover 22 on the end face of the horizontal shaft 2, and then disconnect the connection between the swing device 8 and the transmission plate 6. The transmission plate 6 can then be removed as a whole, and the rollers 72 on both sides of the mounting slot 61 can be replaced. The entire process does not involve the internal parts of the bed 1, greatly simplifying the operation process and shortening maintenance downtime.

[0037] In a preferred embodiment, see [reference] Figure 2 , 56. The buffer assembly 83 includes a first screw 831, a buffer spring 832, and an adjusting nut 833. The first screw 831 passes through the lower bell hammer arm 82 and the upper bell hammer arm 81 in sequence and is screwed to the adjusting nut 833. The buffer spring 832 is sleeved on the first screw 831, and its two ends abut against the upper bell hammer arm 81 and the adjusting nut 833, respectively. Specifically, a washer 834 is provided between the buffer spring 832 and the adjusting nut 833 to increase the contact area between the buffer spring 832 and the adjusting nut 833 and improve the uniformity of force distribution. In addition, by rotating the position of the adjusting nut 833 on the first screw 831, the initial compression of the buffer spring 832 can be changed, thereby flexibly adjusting the elastic force of the buffer spring 832 to adapt to the buffering requirements under different working conditions. At the same time, the buffer spring 832 is located outside the upper bell hammer arm 81, which facilitates the replacement of springs with different elastic forces.

[0038] In actual operation, when the transmission plate 6 moves forward, it will drive the lower bell hammer arm 82 to swing forward around the axis of the bell hammer shaft 3. The lower bell hammer arm 82 will drive the upper bell hammer arm 81 to swing forward synchronously through the buffer assembly 83, thereby driving the bell hammer shaft 3 to rotate, and finally causing the lifting seat 5 to move upward along the slide table 4. When the limiting block 53 at the top of the lifting seat 5 abuts against the limiting nut 412 of the upper limit assembly 41, the lifting seat 5 stops moving upward, and the upper bell hammer arm 81 also stops swinging. However, at this time, the transmission plate 6 has not yet finished moving forward, and the lower bell hammer arm 82 continues to swing forward under the continuous push of the transmission plate 6, causing differential deformation of the buffer assemblies 83 on both sides. In the buffer assembly 83 on the left side, the distance between the left side of the lower bell hammer arm 82 and the left side of the upper bell hammer arm 81 is shortened, and the buffer spring 832 is stretched due to its own rebound force. In the buffer assembly 83 on the right side, the distance between the right side of the lower bell hammer arm 82 and the right side of the upper bell hammer arm 81 is increased, and the buffer spring 832 is compressed due to pressure. The buffer springs 832, in both extended and compressed states, work together to absorb the impact force generated by the continuous forward movement of the transmission plate 6, thereby achieving force relief and buffering. This prevents rigid collisions between the lower bell hammer arm 82 and the upper bell hammer arm 81, and between the lifting seat 5 and the limiting assembly, reducing vibration and thus preventing the moving mold 51 from shifting position due to vibration.

[0039] Similarly, when the transmission plate 6 moves backward, it causes the lower bell hammer arm 82 to swing backward around the axis of the bell hammer shaft 3. The lower bell hammer arm 82, through the buffer assembly 83, simultaneously drives the upper bell hammer arm 81 to swing backward, and the bell hammer shaft 3 rotates in the opposite direction. The lifting seat 5 moves downward along the slide table 4. When the lower limit assembly 42 of the lifting seat 5 abuts against the top of the slide table 4, the lifting seat 5 stops moving downward, and the upper bell hammer arm 81 also stops swinging synchronously. However, the transmission plate 6 has not yet moved backward, and the lower bell hammer arm 82 continues to swing backward under the continuous pull of the transmission plate 6. At this time, the deformation state of the buffer assemblies 83 on both sides is opposite to that when moving forward. In the buffer assembly 83 on the left side, the buffer spring 832 is compressed, and in the buffer assembly 83 on the right side, the buffer spring 832 is extended. Through the compression and extension of the buffer spring 832, the impact force generated by the continuous backward movement of the transmission plate 6 can also be absorbed, achieving buffering and force relief, further avoiding rigid collisions between components, and ensuring the stability of the device operation.

[0040] It should be noted that the first screw 831 has a large clearance with the inner holes of the upper bell hammer arm 81, the lower bell hammer arm 82, and the buffer spring 832. This allows the first screw 831 to have space to swing relative to the upper bell hammer arm 81 and the buffer spring 832 when it swings with the lower bell hammer arm 82. This prevents the components from jamming due to insufficient clearance and ensures smooth relative swinging between the lower bell hammer arm 82 and the upper bell hammer arm 81. Simultaneously, to improve the installation stability of the buffer spring 832, the top of the upper bell hammer arm 81 is provided with a mounting cavity 811 adapted to the buffer spring 832, and the lower part of the buffer spring 832 is embedded in the mounting cavity 811. The lateral constraint of the buffer spring 832 by the mounting cavity 811 effectively prevents the buffer spring 832 from shifting laterally during compression or extension, ensuring its stable axial deformation and further improving the operational reliability of the buffer assembly 83.

[0041] Further, see Figure 6The lower hammer arm 82 is equipped with an adjustable adjusting column 84, which is rotatably connected to the end of the transmission plate 6 away from the lifting cam 21. By changing the installation position of the adjusting column 84 on the lower hammer arm 82, its distance from the center of the hammer shaft 3 can be changed; when the adjusting column 84 moves up or down, the distance from the connection point of the transmission plate 6 and the lower hammer arm 82 to the axis of the hammer shaft 3 changes accordingly. Specifically, this distance is inversely related to the swing amplitude of the lower hammer arm 82 and the vertical movement distance of the lifting seat 5; when the distance is smaller, under the same translational amount of the transmission plate 6, the swing amplitude of the lower hammer arm 82 is larger, and thus, through the linkage of the hammer shaft 3 and the transmission rod 9, the vertical movement distance of the lifting seat 5 is larger; conversely, when the distance is larger, the swing amplitude of the lower hammer arm 82 is smaller, and the movement distance of the lifting seat 5 is smaller. Thus, by flexibly adjusting the position of the adjusting column 84, the lifting stroke of the moving mold 51 required for processing different workpieces can be precisely adapted, improving the versatility of the device. Meanwhile, the swing device 8 and the transmission plate 6 are both neatly arranged outside the bed 1, without any obstruction from the bed 1 structure, providing ample operating space and facilitating direct observation and maintenance of each component by the operator.

[0042] Furthermore, see Figure 5 , 6 The lower hammer arm 82 has an adjustment groove 821 extending vertically. The adjustment column 84 includes a sliding part 841 and a rotating part 842. The sliding part 841 is slidably connected to the adjustment groove 821. A second screw 85 is rotatably connected within the adjustment groove 821 and is screwed to the sliding part 841. The rotating part 842 is rotatably connected to the transmission plate 6. When it is necessary to adjust the vertical position of the adjustment column 84, simply rotate the second screw 85. Since the second screw 85 is screwed to the sliding part 841 and is rotatably installed within the adjustment groove 821, the rotational motion of the second screw 85 can be converted into the linear motion of the sliding part 841 along the adjustment groove 821, causing the sliding part 841 and the rotating part 842 connected to it to move up and down synchronously, thereby changing the distance between the adjustment column 84 and the center of the hammer shaft 3.

[0043] In a preferred embodiment, see [reference] Figure 3 , 5 The end of the bell hammer shaft 3 furthest from the upper bell hammer arm 81 is equipped with a counterweight assembly, which is used to balance the bell hammer shaft 3. The counterweight assembly balances the torques on both sides of the bell hammer shaft 3, ensuring that the bell hammer shaft 3 always rotates smoothly and reducing vibrations caused by center of gravity shift. Specifically, the counterweight assembly includes a cantilever 31 and a counterweight block. One end of the cantilever 31 is fixedly connected to the end of the bell hammer shaft 3, and the other end extends radially outward along the bell hammer shaft 3, forming an extended lever arm. The counterweight block is detachably installed at the end of the cantilever 31 furthest from the bell hammer shaft 3, and different weights of counterweight blocks can be selected according to actual balancing needs. The counterweight block is not shown in the accompanying drawings.

[0044] In the alternative, the counterweight assembly adopts an elastic balance structure. The counterweight assembly includes a cantilever 31 and a spring. The spring is located above the cantilever 31, and its two ends are movably connected to the end of the cantilever 31 and the bed 1, respectively. The elastic deformation of the spring applies downward pressure to the cantilever 31, thereby balancing the torque on both sides of the bell hammer shaft 3.

[0045] Alternatively, the counterweight assembly includes a cantilever 31 and a tension spring. The tension spring is located below the cantilever 31, and its two ends are movably connected to the end of the cantilever 31 and the bed 1, respectively. The tension spring applies a downward pulling force to the cantilever 31 through its tensile deformation, thereby achieving torque balance of the bell hammer shaft 3 and ensuring its smooth rotation.

[0046] In a preferred embodiment, see [reference] Figure 2 , 5 The lifting seat 5 has a horizontally placed I-shaped slide rail 52 at its bottom. Two transmission rods 9 and two sliders 91 are provided. The end of one transmission rod 9 is rotatably connected to one slider 91 via a short shaft 92, and one slider 91 is slidably connected to one side of the slide rail 52. Through the cooperation of the two transmission rods 9, the two sliders 91, and the I-shaped slide rail 52, when the bell hammer shaft 3 rotates, the two transmission rods 9 simultaneously apply driving force to both sides of the slide rail 52, ensuring that the force on both sides of the slide rail 52 is uniform and balanced. This effectively avoids the phenomenon of offset, tilting, or jamming when the lifting seat 5 moves vertically due to unilateral force, further improving the stability of the lifting seat 5's movement.

[0047] Preferably, the lifting seat 5 and the slide table 4 are connected by a dovetail groove structure, which has a symmetrical dovetail shape in cross section. The mating surfaces of the lifting seat 5 and the slide table 4 fit tightly without obvious gaps. This can effectively limit the lateral movement of the lifting seat 5 during vertical movement, ensuring that the lifting seat 5 always moves smoothly along the preset vertical trajectory, thereby ensuring the positioning accuracy of the moving mold 51 after it moves with the lifting seat 5 and is precisely aligned with the fixed mold 10.

[0048] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solution and inventive concept of the present invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. A movable die lifting device characterized by comprising: The utility model relates to a kind of automatic injection device, including: Bed body (1), the horizontal shaft (2) and the bell crank shaft (3) are rotatably connected on bed body (1), and the end of horizontal shaft (2) is fixed with lifting cam (21); Slide table (4), with bed body (1) horizontal sliding connection; Lifting seat (5), with slide table (4) vertical sliding connection, and lifting seat (5) front end is equipped with several movable mould (51); Transmission plate (6), lifting cam (21) drives transmission plate (6) to reciprocate by reciprocating moving assembly (7); Swing device (8), including the upper bell arm (81) being fixed on bell crank shaft (3), and the lower bell arm (82) being rotatably connected with bell crank shaft (3), and the two sides of upper bell arm (81) and lower bell arm (82) are connected by buffer assembly (83) respectively;Lower bell arm (82) is rotatably connected with the end of transmission plate (6) away from lifting cam (21), and reciprocating transmission plate (6) drives lower bell arm (82) to reciprocate around the axis of bell crank shaft (3); At least one transmission rod (9), one end of each transmission rod (9) is fixed in the middle of bell crank shaft (3), and the other end is rotatably connected with sliding block (91), and sliding block (91) is horizontally slidably connected with the bottom of lifting seat (5).

2. The movable die lifting device according to claim 1, characterized in that, Further including upper limit component (41) installed on the top of slide table (4) and lower limit component (42) installed on the top of lifting seat (5);Upper limit component (41) is abutted with the top of lifting seat (5) to limit the highest position of lifting seat (5) movement;Lower limit component (42) is abutted with slide table (4) to limit the lowest position of lifting seat (5) movement.

3. The movable die lifting device according to claim 1, wherein The reciprocating moving assembly (7) includes a guide block (71) rotatably connected to the end of the horizontal shaft (2), the transmission plate (6) has an installation slot (61) extending along its length direction, the guide block (71) is embedded in the installation slot (61) and slidably connected with the installation slot (61), and the transmission plate (6) is rotatably connected with two rollers (72) on both sides of the installation slot (61), and the two rollers (72) slide along the two corresponding arc surfaces of the lifting cam (21) respectively.

4. The movable die lifting device according to claim 3, characterized in that The guide block (71) includes a T-shaped block (711) and a cover plate (712), the T-shaped block (711) and the cover plate (712) are connected to form two guide slots (713) arranged in an up-down direction, and the two guide slots (713) are slidably connected with the installation slot (61) respectively;The T-shaped block (711) is provided with a through hole (714) extending to the cover plate (712), and the through hole (714) is rotatably connected with the horizontal shaft (2).

5. The movable die lifting device according to claim 3, wherein The ends of the horizontal shaft (2) and the bell crank shaft (3) extend to the outside of the bed body (1), the lifting cam (21) and the guide block (71) are located on the outside of the bed body (1), and the guide block (71) is located on the side away from the bed body (1) of the lifting cam (21).

6. The movable die lifter of claim 1, wherein The buffer assembly (83) comprises a first screw rod (831), a buffer spring (832) and an adjusting nut (833), the first screw rod (831) is in threaded connection with the adjusting nut (833) after sequentially penetrating through the lower clock hammer arm (82) and the upper clock hammer arm (81); the buffer spring (832) is sleeved on the first screw rod (831) and abuts against the upper clock hammer arm (81) and the adjusting nut (833) at two ends respectively.

7. The movable die lifter of claim 1, wherein The lower clock hammer arm (82) is provided with an adjusting column (84) which is vertically position-adjustable, and the adjusting column (84) is rotationally connected with the end of the transmission plate (6) away from the lifting cam (21).

8. The movable die lifting device according to claim 7, wherein The lower clock hammer arm (82) is provided with an adjusting groove (821) extending in the vertical direction, the adjusting column (84) comprises a sliding part (841) and a rotating part (842), the sliding part (841) is in sliding connection with the adjusting groove (821), the adjusting groove (821) is rotationally connected with a second screw rod (85) therein, and the second screw rod (85) is in threaded connection with the sliding part (841); the rotating part (842) is rotationally connected with the transmission plate (6).

9. The movable die lifter of claim 1, wherein, The clock hammer shaft (3) is provided with a counterweight assembly at the end away from the upper clock hammer arm (81), and the counterweight assembly is used for balancing the clock hammer shaft (3).

10. The movable die lifting device according to claim 1, wherein The lifting seat (5) is provided with an I-shaped slide rail (52) horizontally arranged at the bottom, the transmission rod (9) and the sliding block (91) are both provided with two, the end of one transmission rod (9) is rotationally connected with one sliding block (91) through a short shaft (92), and one sliding block (91) is in sliding connection with one side of the slide rail (52).

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