A steamed bun dough forming device

Abstract

This invention belongs to the field of food machinery technology, and in particular to a steamed bun forming device. It performs square-to-round forming without changing the temperature of the dough. The device includes a forming frame, on which, from front to back, are a pressing and shaping mechanism, a steamed bun cutting mechanism, and a rolling roller mechanism. A steamed bun shaping gripper is located behind the rolling roller mechanism on the forming frame. The steamed bun shaping gripper includes a support frame with guide rods arranged in a crisscross pattern. Gripper assemblies are located on both sides of the guide rods. A drive assembly on the support frame drives the gripper assemblies to move along the guide rods, causing the four gripper assemblies to close or open. Because the steamed bun shaping gripper has four gripper assemblies, each with a shaping clamping plate whose inner surface is curved, the gripper can close under the drive assembly to perform final shaping of the steamed bun, resulting in a more aesthetically pleasing final product.

Description

Technical Field

[0001] This invention belongs to the field of food machinery technology, specifically relating to a steamed bun dough forming device. Background Technology

[0002] A steamed bun machine is a device used to process dough into steamed bun blanks, which are then steamed to make steamed buns. The machine can continuously process dough into steamed bun blanks in batches, significantly improving the efficiency of steamed bun production. In our previous generation of steamed bun machines (see Chinese patent document CN114504005A), the process was accomplished by a set of steamed bun blank forming components. These components included pressing blocks, opposing rotating wheels, extrusion blocks, cutting blades, and a post-cutting shaping device. Multiple pressing blocks were provided, their bottom surfaces matching the top shape of the steamed bun blanks to be produced. The opposing rotating wheels used lateral extrusion to separate the dough into individual steamed bun blanks. The extrusion blocks used longitudinal extrusion to further separate the adhered portions between the initially separated steamed bun blanks. The cutting blades were used to completely cut off the adhered portions between the steamed bun blanks, and the post-cutting shaping device was used to trim the cuts on the steamed bun blanks.

[0003] The following aspects of this previous generation steamed bun machine need improvement: (1) During the shaping process of the steamed bun dough by the shaping device, the main task is to shape the top of the steamed bun into an arc shape and then to shape the cuts on both sides of the steamed bun dough to the bottom of the steamed bun dough. The final steamed bun dough is not aesthetically pleasing enough, so it needs to be further shaped. (2) In this previous generation steamed bun machine, when the cutting blade cuts the dough strips that stick together between adjacent steamed bun dough, only the process of cutting the dough strips is performed. The function is simple and the function of the entire cutting mechanism is not fully developed. (3) In this previous generation steamed bun machine, because the dough strips that connect between adjacent steamed bun dough are wider after being vertically squeezed by the extrusion block, the cuts formed after the dough strips are cut by the cutting blade are larger. When the cuts are repaired later, scars are easily left on the steamed bun dough, resulting in the surface of the steamed buns not being smooth enough and easily having obvious scars or cracks. Summary of the Invention

[0004] The present invention aims to provide a steamed bun dough forming device, which can shape the steamed bun dough to make the steamed bun dough more aesthetically pleasing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A steamed bun forming device is provided, including a forming frame. From front to back, a pressing and shaping mechanism, a steamed bun cutting mechanism, and a rolling roller mechanism are arranged on the forming frame. Multiple sets of first molding block assemblies for shaping the top of the steamed bun are also provided on the forming frame. A steamed bun shaping gripper is located behind the rolling roller mechanism on the forming frame. The steamed bun shaping gripper includes a support frame. The support frame has first and second guide rods arranged in a cross pattern. Gripper assemblies are respectively provided on both sides of the first and second guide rods. The support frame has a driving assembly for driving the gripper assemblies to move along the first or second guide rods, causing the four gripper assemblies to retract or open. Each gripper assembly includes a gripper bracket and a shaping clamping plate. The shaping clamping plate is located at the bottom of the gripper bracket, and the inner surface of the shaping clamping plate is arc-shaped.

[0007] Preferably, the driving assembly includes a rotating disk disposed on the support frame, the rotating disk having four arc-shaped guide grooves, each of the gripper brackets having a guide wheel disposed in the guide groove, and the driving assembly further including a first swing rod connected to the rotating disk, the first swing rod being used to drive the rotating disk to rotate back and forth.

[0008] Preferably, the gripper bracket includes a vertical rod, the top of which is provided with a movable slider corresponding to the first guide rod or the second guide rod, the bottom of which is provided with a horizontal bar, and the rear side of the shaping clamp is provided with a clamping plate connecting rod that intersects with the horizontal bar, the clamping plate connecting rod being connected to the horizontal bar via an adjustable connecting component; a central pressure plate is also provided at the bottom of the support frame, the central pressure plate being located between the four gripper assemblies.

[0009] Preferably, a pre-cutting gripper for the steamed bun blank is also provided on the forming frame between the pressing and shaping mechanism and the steamed bun blank cutting mechanism. The pre-cutting gripper for the steamed bun blank includes two gripper assemblies arranged opposite to each other. Each gripper assembly includes a vertical blade and a blade handle. The vertical blade is mounted on the blade handle, and a first spring is provided between the vertical blade and the blade handle, so that the vertical blade can extend and retract on the blade handle when subjected to force. The vertical blade includes a blade body, and a vertical cutting edge is provided on one side of the blade body. A pressing cutting edge is provided on the side of the cutting edge.

[0010] Preferably, the blade body of the vertical blade is provided with a handle guide hole that matches the handle, the lower part of the handle is disposed in the handle guide hole, and a bottom cover connected to the handle is provided at the bottom of the blade body; a spring groove is provided on the handle, the first spring is disposed in the spring groove, and the upper middle part of the handle guide hole is enlarged into a spring hole that matches the first spring.

[0011] Preferably, the lower end of the cutting edge extends downward relative to the blade body; the bottom surface of the cutting edge is a plane; and the extrusion cutting edge is an arc-shaped cutting edge.

[0012] Preferably, the steamed bun cutting mechanism includes a drive frame with two blade assemblies for clamping each other. The drive frame drives the two blade assemblies to move closer or further apart along the clamping direction. Each blade assembly includes a blade with its inner side curved outwards into an arc shape. The bottom of the blade has a cutting edge, and the top of the blade is mounted on the drive frame via a blade holder. The mechanism also includes a second molding block assembly, which includes a second molding block and a molding support. The two sides of the second molding block are arc-shaped surfaces that match the inner sides of the blades. The second molding block is mounted on the molding support and positioned between the two blades. The bottom of the second molding block is an upwardly arched arc-shaped bottom surface.

[0013] Preferably, the blade holder includes a guide block and a telescopic slider. The guide block has a guide hole that matches the telescopic slider. The upper part of the telescopic slider is disposed in the guide hole. The top of the guide block has an upper end cap that is connected to the telescopic slider. A second spring is provided between the guide block and the telescopic slider. The top of the blade is connected to the telescopic slider.

[0014] Preferably, the drive frame includes a first cross arm, a third guide rod in the front-rear direction on the first cross arm, and second cross arms on both sides of the first cross arm on the third guide rod, with the blade holder mounted on the second cross arms; a rotary support shaft is also provided on the first cross arm, a rotatable linkage frame is provided on the rotary support shaft, and vertical shafts are provided on the second cross arms on both sides; the linkage frame has two connecting rods rotatably connected to the vertical shafts respectively; the drive frame further includes a second swing rod for driving the linkage frame to swing.

[0015] The molding support includes a fourth guide rod that can move up and down and is disposed at one end of the first cross arm. The second molding block is disposed at the bottom of the fourth guide rod, and a third spring is sleeved on the fourth guide rod. The third spring is sandwiched between the second molding block and the first cross arm.

[0016] Preferably, the pressing and shaping mechanism includes clamping rollers and vertical extrusion blocks arranged at intervals, and each of the first molding block components is staggered among the clamping rollers, vertical extrusion blocks, steamed bun blank initial cutting grippers, steamed bun blank cutting mechanism, and rolling roller mechanism.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The steamed bun forming device is equipped with a steamed bun shaping gripper, which includes a support frame. The support frame is provided with a first guide rod and a second guide rod arranged in a cross pattern. Gripper assemblies are respectively provided on both sides of the first guide rod and the second guide rod. The support frame is provided with a drive assembly for driving the gripper assemblies to move along the first guide rod or the second guide rod, so that the four gripper assemblies can perform a closing or opening action. Since the steamed bun shaping gripper has four gripper assemblies, each gripper assembly is provided with a shaping clamping plate. The inner surface of the shaping clamping plate is an arc surface, so that it can close under the drive assembly to perform the final shaping of the steamed bun, making the final formed steamed bun more beautiful. Moreover, the steamed bun forming device performs square-to-round forming without changing the temperature of the dough itself.

[0019] 2. The steamed bun forming device includes a steamed bun cutting mechanism comprising a drive frame with two cutting blade assemblies for clamping from front to back. Each cutting blade assembly includes a blade plate with its inner side curved outwards into an arc shape, and a first molding assembly comprising a molding block disposed between the two blade plates. The bottom of the molding block has an upwardly arched arc-shaped bottom surface. Because the inner side of the blade plate in the steamed bun cutting mechanism is curved outwards, and a molding block is disposed between the cutting blades on both sides, the steamed buns can be shaped while the dough connecting the steamed buns is being cut. In addition, because the cutting method of the steamed bun cutting mechanism involves cutting with the blade edge while simultaneously driving the two cutting blade assemblies to clamp from front to back through the drive frame, the dough is pulled towards the cutting blades while being cut. Compared to simple cutting, this pulling cutting method results in a more thorough breakage of the dough.

[0020] 3. The steamed bun forming device is equipped with a steamed bun initial cutting gripper, which includes two gripper components arranged opposite to each other. The gripper components include a cutter and a handle. The cutter is installed on the handle and includes a blade body. One side of the blade body has a vertical cutting edge. The side of the cutting edge is the cutting edge. The steamed bun initial cutting gripper can clamp and cut the dough strips that connect adjacent steamed buns horizontally, so that the dough strips that connect adjacent steamed buns will become narrower and thinner. Therefore, when the thinner dough strips that connect adjacent steamed buns are completely cut off by other components in the later stage, the cut is smaller and the small cut is easier to shape, so that the surface of the final formed steamed bun is smoother and the surface of the steamed bun will not have scars or cracks. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the steamed bun dough forming device of the present invention.

[0023] Figure 2 This is one of the three-dimensional structural schematic diagrams of the steamed bun blank shaping clamp in one embodiment of the steamed bun blank forming device of the present invention.

[0024] Figure 3 This is the second three-dimensional structural schematic diagram of the steamed bun shaping clamp in one embodiment of the steamed bun forming device of the present invention.

[0025] Figure 4 This is a three-dimensional structural diagram of the steamed bun blank forming device of the present invention, showing the steamed bun blank shaping gripper without the rotating disk installed.

[0026] Figure 5 This is one of the three-dimensional structural schematic diagrams of the gripper assembly in the steamed bun forming device of the present invention.

[0027] Figure 6 This is the second three-dimensional structural schematic diagram of the gripper assembly in the steamed bun forming device of the present invention.

[0028] Figure 7 This is a three-dimensional structural diagram of the steamed bun blank initial cutting clamp in one embodiment of the steamed bun blank forming device of the present invention.

[0029] Figure 8 This is a three-dimensional structural diagram of the gripper assembly of the steamed bun blank initial cutting gripper in one embodiment of the steamed bun blank forming device of the present invention.

[0030] Figure 9 This is a front view of the assembled cutter and handle in one embodiment of the steamed bun dough forming device of the present invention, specifically in one embodiment of the initial cutting gripper for steamed bun dough.

[0031] Figure 10 for Figure 9 AA sectional view.

[0032] Figure 11 This is a three-dimensional structural diagram of the cutter in one embodiment of the steamed bun dough forming device of the present invention, specifically in one embodiment of the steamed bun dough initial cutting clamp.

[0033] Figure 12 This is a three-dimensional structural diagram of the steamed bun cutting mechanism in one embodiment of the steamed bun forming device of the present invention.

[0034] Figure 13 This is one of the three-dimensional structural schematic diagrams of the cutting blade assembly in the steamed bun blank cutting mechanism of an embodiment of the steamed bun blank forming device of the present invention.

[0035] Figure 14 This is the second three-dimensional structural schematic diagram of the cutting blade assembly in the steamed bun blank cutting mechanism of one embodiment of the steamed bun blank forming device of the present invention.

[0036] Figure 15This is a schematic diagram of the installation of the second molding block assembly in the steamed bun blank cutting mechanism of an embodiment of the steamed bun blank forming device of the present invention.

[0037] Figure 16 This is a three-dimensional structural diagram of the drive frame in the steamed bun blank cutting mechanism of one embodiment of the steamed bun blank forming device of the present invention.

[0038] The labels in the diagram are as follows:

[0039] Steamed bun dough initial cutting clamp 100, clamp assembly 1, vertical blade 11, blade body 111, blade handle guide hole 1111, spring hole 1112, blade edge 112, extrusion blade edge 1121, blade handle 12, spring groove 121, first spring 13, bottom cover 14, first mounting block 15, second mounting block 16;

[0040] Steamed bun blank cutting mechanism 200, drive frame 2, first horizontal arm 21, third guide rod 22, second horizontal arm 23, vertical shaft 231, rotating support shaft 24, connecting rod frame 25, connecting rod part 251, second swing rod 26, roller 261, sliding sleeve 27, cutting blade assembly 3, blade plate 31, guide block 32, telescopic slider 33, sliding rod part 331, upper end cover 34, second spring 35, blade handle 36, second molding block assembly 4, second molding block 41, fourth guide rod 42, third spring 43;

[0041] Steamed bun dough shaping gripper 300, support frame 6, first guide rod 61, second guide rod 62, support arm 63, support block 64, vertical shaft 65, gripper assembly 7, shaping clamping plate 71, guide wheel 72, upright rod 73, moving slider 74, crossbar 75, clamping plate connecting rod 76, moving block 77, drive assembly 8, rotating disk 81, guide groove 811, first swing rod 82, middle pressure plate 9;

[0042] Forming frame 400, first longitudinal bar 401, second longitudinal bar 402, third longitudinal bar 403;

[0043] The components include a clamping roller 500, a rear vertical extrusion block 600, a front vertical extrusion block 700, a rubbing roller mechanism 800, and a first molding block assembly 900. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In one embodiment, a steamed bun forming device is provided, which is used to shape a dough column into individual steamed bun blanks, such as... Figure 1 As shown, the steamed bun forming device includes a top forming frame 400. The forming frame 400 is provided with a first longitudinal rod 401, a second longitudinal rod 402 and a third longitudinal rod 403. The steamed bun forming device is installed on a steamed bun machine. The first longitudinal rod 401 and the second longitudinal rod 402 can be driven by the power device on the steamed bun machine to move closer or further apart from each other. The third longitudinal rod 403 is fixedly installed on the frame of the steamed bun machine. The forming frame 400 is equipped with a pressing and shaping mechanism, a steamed bun blank cutting mechanism 200, and a rolling mechanism 800 from front to back. The pressing and shaping mechanism includes two pairs of clamping rollers 500 spaced apart, a front vertical extrusion block 700, and a rear vertical extrusion block 600. The pressing and shaping mechanism is used to initially press the dough column, which passes through the bottom of the steamed bun blank forming device, into individual steamed bun blanks. The two pairs of clamping rollers 500 extrude from both sides of the dough column, the front vertical extrusion block 700 extrudes from the top of the dough column, and the rear vertical extrusion block 600 further presses and cuts the top of the dough column, improving the separation degree between adjacent steamed bun blanks. The forming frame 400 is also equipped with multiple sets of first molding block assemblies 900 for shaping the top of the steamed bun blanks. The lower end of the first molding block assembly 900 is equipped with a molding block with an arched bottom surface, and the molding block can be elastically raised and lowered.

[0046] The rolling mechanism 800 is used to roll the cut edges of the cut dough into pieces, so that the cut edges do not leave scars on the surface of the dough.

[0047] A dough shaping gripper 300 is provided on the forming frame behind the rolling mechanism F, combined with... Figure 2-6 As shown, the dough shaping gripper 300 includes a support frame 6, which mainly supports other components. The support frame 6 has a first guide rod 61 and a second guide rod 62 arranged in a cross pattern. Each of the first guide rod 61 and the second guide rod 62 includes two cylindrical rods. Gripper assemblies 7 are provided on both sides of the first guide rod 61 and the second guide rod 62, with a total of four gripper assemblies 7. The support frame 6 also has a drive assembly 8 for driving the gripper assemblies 7 to move along the first guide rod 61 or the second guide rod 62. The drive component 8 can synchronously drive the four gripper components 7, causing the four gripper components 7 to retract or open. When the four gripper components 7 retract, they can clamp the steamed bun dough in the middle and shape the four corners of the steamed bun dough. Each gripper component 7 includes a gripper bracket and a shaping clamping plate 71. The gripper bracket is slidably mounted on the first guide rod 61 or the second guide rod 62. The shaping clamping plate 71 is set at the bottom of the corresponding gripper bracket. The inner side of the shaping clamping plate 71 is an arc-shaped surface for shaping the corners of the steamed bun dough.

[0048] Combination Figure 1 As shown, the method of using the shaping clamp for this steamed bun dough is as follows: (1) Figure 1This is a three-dimensional structural diagram of an embodiment of the steamed bun forming device of the present invention. A conveyor belt (not shown in the figure) is provided below the steamed bun forming device. The conveyor belt is used to convey the dough column for making steamed buns forward. At the bottom of the conveyor belt, there is a support plate (not shown in the figure) that is driven up and down by the drive mechanism of the steamed bun machine. When the support plate moves upward, it lifts the conveyor belt and the dough column on it and moves upward, so that the dough column abuts against the shaping components of the steamed bun forming device, and finally the dough column forms individual steamed buns. (2) When the dough column is conveyed by the conveyor belt to the position of the steamed bun shaping gripper, the dough column has been shaped into the initial steamed bun shape by the multiple first molding block components 900 and the clamping roller 500. The dough connecting adjacent steamed buns is cut by the front vertical extrusion block 700, the rear vertical extrusion block 600 and the steamed bun cutting mechanism to form individual steamed buns. The steamed bun shaping gripper is used to shape the four corners of the individual steamed buns. (3) When the conveyor belt transports the steamed bun blank, the steamed bun blank will enter between the four gripper assemblies 7 due to the lifting of the conveyor belt. At this time, the drive assembly 8 drives the four gripper assemblies 7 to close together, so that the inner side of the shaping clamp 71 of the four gripper assemblies 7 is close to the four corners of the steamed bun blank and squeezed appropriately, thereby shaping the four corners of the steamed bun blank, making the shaped steamed bun more beautiful.

[0049] The effect of the steamed bun shaping gripper is as follows: Since the steamed bun shaping gripper is equipped with four gripper components 7, each gripper component 7 is equipped with a shaping clamping plate 71. The inner side of the shaping clamping plate 71 is an arc surface, so under the drive of the drive component 8, it can close up to perform the final shaping of the steamed bun, making the final shaped steamed bun more beautiful. Moreover, the steamed bun forming device performs square-to-round forming without changing the temperature of the dough itself.

[0050] Furthermore, in another embodiment, such as Figure 2-6 As shown, the driving assembly 8 of the steamed bun shaping gripper includes a rotating disk 81 mounted on a support frame 6. The rotating disk 81 has four arc-shaped guide grooves 811, which are arranged in an array at the same included angle. Each gripper bracket is provided with a guide wheel 72. The outer circumference of the guide wheel 72 is provided with an annular groove that engages with the rotating disk 81. The guide wheel 72 is correspondingly positioned in the guide groove 811. The driving assembly 8 also includes a first swing rod 82 connected to the rotating disk 81. The first swing rod 82 is used to drive the rotating disk 81 to rotate back and forth.

[0051] The working principle of this dough shaping clamp is as follows: (Combined with...) Figure 1As shown, the support frame 6 of the dough shaping gripper is fixedly installed on the third longitudinal rod 403 of the entire dough forming device. The dough forming machine is equipped with a power component that can drive the first swing arm 82 to swing back and forth within a certain angle. When the first swing arm 82 swings back and forth, it drives the rotating disk 81 to rotate back and forth. For example, in Figure 1 When the rotating disk 81 rotates clockwise, the outer edge of the guide groove 811 drives the guide wheel 72 to move inward along the corresponding guide rod, thus achieving a closing action. When the rotating disk 81 rotates counterclockwise, the inner edge of the guide groove 811 drives the guide wheel 72 to move outward along the corresponding guide rod, thus achieving an opening action. In this way, the rotating disk 81 can drive the four gripper assemblies 7 to move synchronously.

[0052] Furthermore, in another embodiment, such as Figure 1-6 As shown, the gripper bracket of the steamed bun shaping clamp includes a vertical rod 73. The top of the vertical rod 73 is provided with a movable slider 74 corresponding to either the first guide rod 61 or the second guide rod 62. The movable slider 74 has a sliding sleeve mounting hole, and the sliding sleeve is installed to assemble with the first guide rod 61 or the second guide rod 62. At the bottom of the vertical rod 73 is a horizontal bar 75. A clamping plate connecting rod 76, intersecting the horizontal bar 75, is located on the rear side of the shaping clamping plate 71. The horizontal bar 75 and the clamping plate connecting rod 76 are perpendicularly intersecting. The clamping plate connecting rod 76 is connected to the horizontal bar 75 via an adjustable connecting component, which can be a screw. This allows adjustment of the installation position of the clamping plate connecting rod 76 on the horizontal bar 75, thereby adjusting the installation position of the shaping clamping plate 71. By adjusting the installation position of the shaping clamping plate 71, the shaping area and the squeezing force on the steamed bun can be changed.

[0053] Furthermore, in another embodiment, such as Figure 2-6 As shown, the dough shaping clamp has a first adjustment groove in the crossbar 75, a moving block 77 in the first adjustment groove, and a second adjustment groove in the clamping plate connecting rod 76. An adjustable connecting component passes through the second adjustment groove and is connected to the moving block 77. The moving block 77 can move along the first adjustment groove. The bottom of the moving block 77 has a screw hole. The adjustable connecting component is a screw screwed onto the moving block 77.

[0054] Furthermore, in another embodiment, such as Figure 2-6 As shown, the first guide rod 61 and the second guide rod 62 of the dough shaping clamp intersect perpendicularly. This intersection angle is suitable for shaping the four corners of the dough.

[0055] Furthermore, in another embodiment, such as Figure 2-6As shown, the support frame 6 of the steamed bun shaping gripper includes a support arm 63. The support arm 63 is used to install on the frame of the steamed bun machine where the steamed bun shaping gripper is located. The support arm 63 is provided with a support block 64. The support block 64 is provided with holes for corresponding installation of the first guide rod 61 and the second guide rod 62. The first guide rod 61 and the second guide rod 62 are fixedly installed on the support block 64. A vertical shaft 65 is also provided in the middle of the support block 64. The vertical shaft 65 is non-rotatable. The rotating disk 81 is assembled on the vertical shaft 65 through bearings.

[0056] Furthermore, in another embodiment, such as Figure 2-6 As shown, the steamed bun shaping gripper also has a central pressure plate 9 at the bottom of the support frame 6. The central pressure plate 9 is fixed to the bottom of the vertical shaft 65 and is located between the four gripper assemblies 7. The central pressure plate 9 is used to perform micro-pressure shaping on the top surface of the steamed bun, making the steamed bun more aesthetically pleasing.

[0057] Furthermore, such as Figure 1 and Figure 7-10 As shown, a steamed bun blank initial cutting gripper 100 is also provided on the forming frame 400 between the pressing and shaping mechanism and the steamed bun blank cutting mechanism 200. The steamed bun blank initial cutting gripper 100 includes two gripper assemblies 1 arranged opposite each other. The two gripper assemblies 1 have the same structure and are arranged symmetrically from left to right. Taking the left gripper assembly 1 as an example, the gripper assembly 1 includes a vertical blade 11 and a blade handle 12. The vertical blade 11 is mounted on the blade handle 12, and the blade handle 12 is a vertical rod. A first spring 13 is provided between the vertical blade 11 and the blade handle 12, so that the vertical blade 11 can extend and retract on the blade handle 12 when subjected to force. Specifically, when the vertical blade 11 is subjected to force, the blade can extend and retract on the blade handle 12. When the blade 11 is subjected to upward resistance pressure, it can move upward along the handle 12, causing the first spring 13 to compress or extend. When the upward resistance pressure is released, under the restoring force of the first spring 13, the blade 11 returns to its original position downward. The blade 11 includes a blade body 111, and a vertical blade edge 112 is provided on one side of the blade body 111. The blade edge 112 is roughly a triangular prism, which gradually narrows from one side to the other. The narrowest part of the blade edge 112 is the extrusion blade edge 1121. The blade edge of each of the two gripper assemblies 1 clamps the adjacent steamed bun dough pieces to perform initial cutting.

[0058] Combination Figure 1 As shown, the initial cutting and clamping method for this steamed bun dough is as follows: (1) Figure 1The frame 400 of the steamed bun forming device is provided with a first longitudinal bar 401 and a second longitudinal bar 402. The two gripper components 1 of the steamed bun initial cutting gripper are respectively installed on the first longitudinal bar 401 and the second longitudinal bar 402. The first longitudinal bar 401 and the second longitudinal bar 402 can be driven by the drive mechanism of the steamed bun forming device to move closer to each other or further away from each other, thereby causing the two gripper components 1 of the steamed bun initial cutting gripper to move closer to each other or further away from each other. (2) When the dough column is conveyed by the conveyor belt to the position of the initial cutting gripper of the steamed bun, the dough column has been shaped into the initial shape of the steamed bun by the front vertical extrusion block 700, the two pairs of clamping rollers 500 and the rear vertical extrusion block 600. The front vertical extrusion block 700 is mainly for vertical extrusion, and the rear vertical extrusion block 600 is thinner at the bottom and is used for vertical pressing and cutting. At this time, there is still dough strip connected between adjacent steamed buns. When the two gripper components 1 approach each other, they can further pre-cut the dough strip connected between adjacent steamed buns, making the connected dough strip narrower and thinner or even broken (depending on the distance between the two gripper components 1 when they approach each other), in preparation for the subsequent complete cutting of the dough strip.

[0059] The advantages of this initial cutting gripper for steamed bun dough are as follows: In the entire steamed bun dough forming device, the initial cutting component preceding the initial cutting gripper is the rear vertical extrusion block 600. The rear vertical extrusion block 600 longitudinally cuts the dough strips connecting the steamed bun doughs formed by the two pairs of clamping rollers 500. The dough strips after longitudinal cutting by the rear vertical extrusion block 600 are relatively wide. After being clamped and transversely cut by the initial cutting gripper, the dough strips connecting adjacent steamed bun doughs narrow and become thinner. Therefore, when other components completely cut off the thinner dough strips connecting adjacent steamed bun doughs, the cut is smaller, and the smaller cut is easier to shape, resulting in a smoother surface on the final shaped steamed bun dough, and preventing damage to the steamed bun's surface after steaming. Because the vertical blade 11 can extend and retract on the blade handle 12 under force, the conveyor belt supported by the support plate at the bottom makes soft contact with the vertical blade 11, avoiding damage to the conveyor belt and allowing for more free vertical movement of the conveyor belt.

[0060] Furthermore, in another embodiment, such as Figure 10-11As shown, the initial cutting gripper for the steamed bun dough has a handle guide hole 1111 in the blade body 111 of the upright blade 11 that matches the handle 12. The lower part of the handle 12 is located in the handle guide hole 1111. A bottom cover 14 connected to the handle 12 is located at the bottom of the blade body 111, supporting the blade body 111. A spring groove 121 is provided in the middle of the handle 12, and a first spring 13 is located in the spring groove 121. The upper middle area of ​​the handle guide hole 1111 is expanded into a spring hole 1112 that matches the first spring 13. The lower end of the first spring 13 rests on the stepped surface at the bottom of the spring hole 1112. When the upright blade 11 is subjected to upward pressure, the upright blade 11 slides upward relative to the handle 12, compressing the first spring 13. When the upright blade 11 is no longer subjected to upward pressure, the first spring 13 rebounds downward, causing the upright blade 11 to slide downward relative to the handle 12 and return to its original position.

[0061] Furthermore, in another embodiment, such as Figure 7-11 As shown, the lower end of the blade 112 of the initial cutting gripper for the steamed bun dough extends downward relative to the blade body 111. The downward extension length of the blade body 111 depends on the distance the vertical blade 11 moves upward relative to the handle 12, to ensure that the bottom cover 14 does not hit the bottom conveyor belt. Figure 7-9 As shown, the bottom surface of the blade 111 used for initial cutting of the steamed bun dough is flat, ensuring surface contact between the bottom surface of the blade 111 and the bottom conveyor belt, thus preventing damage to the conveyor belt. Figure 7-8 As shown, the bottom cover 14 of the initial cutting clamp for the steamed bun dough is connected to the bottom surface of the knife handle 12 by screws. In other embodiments, the bottom cover 14 and the knife handle 12 can also be directly screwed together.

[0062] Furthermore, in another embodiment, such as Figure 7-8 As shown, the extrusion blade 1121 of the initial cutting clamp of the steamed bun dough is an arc-shaped blade. When the arc-shaped blunt blade comes into contact with the dough strip connecting adjacent steamed bun dough, it will not leave obvious indentations on the dough strip, making the surface of the steamed bun dough smooth.

[0063] Furthermore, in another embodiment, such as Figure 7-8As shown, the clamping assembly 1 for the initial cutting of the steamed bun dough also includes a first mounting block 15 and a second mounting block 16. The top of the knife handle 12 is installed in the first mounting block 15, and the first mounting block 15 is installed at the bottom of the second mounting block 16. A knife handle fixing hole is provided at the bottom of the first mounting block 15, and the top of the knife handle 12 is installed in the knife handle fixing hole. The knife handle is then fixed by a set screw on the side of the first mounting block. The bottom of the second mounting block 16 has a transverse groove, and the top of the first mounting block 15 has a transverse protrusion that matches the transverse groove. Both the transverse groove and the transverse protrusion are dovetail-shaped, allowing adjustment of the installation position of the first mounting block 15 at the bottom of the second mounting block 16, thereby adjusting the distance between the vertical blades 11 of the two clamping assemblies 1. After the first mounting block 15 is installed, screws are screwed into the side of the second mounting block 16 to clamp the transverse protrusion. The top of the second mounting block 16 also has a longitudinal groove, combined with... Figure 1 As shown, a slide rail is provided at the bottom of the first longitudinal rod 401 and the second longitudinal rod 402, and a longitudinal groove is matched with the slide rail, so that the installation position of the second mounting block 16 on the first longitudinal rod 401 (or the second longitudinal rod 402) can be adjusted, and then it can be fixed by setting a set screw on the side of the second mounting block.

[0064] In one embodiment, a dough cutting mechanism for steamed buns is provided, such as... Figure 12-14 As shown, the steamed bun cutting mechanism includes a drive frame 2, which is driven by the forming frame 400 on the steamed bun forming device where the steamed bun cutting mechanism is located. Two cutting blade assemblies 3 for clamping front and back are provided on the drive frame 2. The two cutting blade assemblies 3 are arranged symmetrically front and back. The cutting blade assembly 3 includes a blade plate 31. The inner side of the blade plate 31 is curved outward into an arc shape. The arc-shaped inner side can shape the two sides of the steamed bun. The bottom of the blade plate 31 is provided with a cutting edge. The cutting edge is thinner than the upper area of ​​the blade plate 31, which is beneficial for cutting the dough strip connecting adjacent steamed buns. The top of the blade plate 31 is mounted on the drive frame 2 through a blade plate frame. The drive frame 2 is used to drive the two cutting blade assemblies 3 to move closer or further away from each other in the clamping direction. The movement of the cutting blade assemblies 3 moving closer or further away from each other in the clamping direction can cut the dough strip connecting adjacent steamed buns and shape the two sides of the cut steamed bun.

[0065] The steamed bun cutting mechanism also includes a second molding block assembly 4, which includes a second molding block 41 and a molding bracket. The molding bracket supports the second molding block 41, which is mounted on the molding bracket. The molding bracket can be assembled with the drive frame 2 and then mounted on the steamed bun machine where the steamed bun cutting mechanism is located. Alternatively, the molding bracket can be mounted separately on the steamed bun machine where the steamed bun cutting mechanism is located. The second molding block 41 is located between two blades 31. The bottom of the second molding block 41 is an upwardly arched arc-shaped bottom surface. By setting the second molding block 41, when the two blades 31 press the steamed bun back and forth, the second molding block 41 can shape the top surface of the steamed bun at the top.

[0066] Combination Figure 1 As shown, the steamed bun blank cutting mechanism is used as follows: (1) When the dough column on the lower side of the steamed bun blank forming device is conveyed to the location of the steamed bun blank cutting mechanism by the conveyor belt, the dough column has been shaped into the initial steamed bun blank shape by the multiple first molding block components and the two pairs of clamping rollers 500 in front, and the dough strip connecting the adjacent steamed buns is squeezed into a small dough strip by the front vertical extrusion block 700 and the rear vertical extrusion block 600. The steamed bun blank cutting mechanism is used to cut the dough strip. Since the conveyor belt is lifted, the dough strip will press against the blade of the blade plate 31 in the right cutting blade component 3 of the steamed bun blank cutting mechanism, thereby cutting the dough strip. At the same time, the two cutting blade components 3 in front and behind the steamed bun blank cutting mechanism will clamp each other in front and behind under the drive of the drive frame 2, further breaking the cut dough strip. The clamping of the two cutting blade components 3 in front and behind can also shape the two sides of the cut steamed bun blank, while the second molding block 41 shapes the top surface of the steamed bun blank in the upper part.

[0067] The effects of this steamed bun cutting mechanism are as follows: Because the inner side of the blade in the steamed bun cutting mechanism is curved outward and a molding block is provided between the cutters on both sides, it can shape the cut steamed buns while cutting the dough strips connecting them. In addition, because the cutting method of this steamed bun cutting mechanism is to cut with the blade edge while driving the two cutter assemblies 3 to clamp each other front and back through the drive frame 2, the dough strip is pulled towards the cutter side when it is cut. Compared with simple cutting, this pulling cutting method makes the dough strip break more thoroughly.

[0068] Furthermore, in another embodiment, such as Figure 13-14As shown, the blade holder of the steamed bun cutting mechanism includes a guide block 32 and a telescopic slider 33. The telescopic slider 33 can slide up and down along the guide block 32. The guide block 32 has a guide hole that matches the telescopic slider 33. The upper part of the telescopic slider 33 is set in the guide hole. The top of the guide block 32 has an upper end cover 34 that is connected to the telescopic slider 33. The upper end cover 34 is connected to the upper end of the telescopic slider 33 by screws to prevent the telescopic slider 33 from detaching from the guide block 32. A second spring 35 is also provided between the guide block 32 and the telescopic slider 33 so that the telescopic slider 33 can be reset. The top of the blade 31 is connected to the telescopic slider 33. The top of the blade 31 has a handle 36, which is installed at the lower part of the telescopic slider 33.

[0069] The extension and retraction mechanism of the blade 31 in the steamed bun cutting mechanism is as follows: When the conveyor belt at the bottom of the steamed bun machine, supported by the support plate, contacts the blade 31, the conveyor belt can lift the blade 31 upwards. The telescopic slider 33 moves upwards relative to the guide block 32, and the second spring 35 is compressed. After the steamed bun cutting mechanism completes the action of cutting the steamed bun, the conveyor belt at the bottom, supported by the support plate, descends, and the blade 31 is no longer subjected to upward resistance. Under the elastic action of the second spring 35, the blade 31 moves downwards and returns to its original position. Because the blade 31 can extend and retract vertically when subjected to force, the contact between the conveyor belt at the bottom, supported by the support plate, and the blade 31 is soft, avoiding damage to the conveyor belt, and allowing for more free vertical movement of the conveyor belt.

[0070] Furthermore, in another embodiment, such as Figure 13-14 As shown, the telescopic slider 33 in the steamed bun cutting mechanism is inverted T-shaped, including an upper sliding rod part 331 and a crossbar part at the bottom of the sliding rod part 331. A second spring 35 is provided on each side of the sliding rod part 331 between the guide block 32 and the telescopic slider 33. Spring receiving holes are provided on the bottom surface of the guide block 32 and the top surface of the crossbar part of the telescopic slider 33, respectively. The upper and lower ends of the second spring 35 are set in the corresponding spring receiving holes. By providing second springs 35 on both sides, the stability of the blade 31 is improved.

[0071] Furthermore, in another embodiment, such as Figure 12 and Figure 15-16As shown, the drive frame 2 of the steamed bun cutting mechanism includes a first horizontal arm 21, which is used to fix the steamed bun cutting mechanism on the frame of the steamed bun machine. A third guide rod 22 in the front-back direction is provided on the first horizontal arm 21. The third guide rod 22 is a cylindrical guide rod and there are two of them. A second horizontal arm 23 is provided on the third guide rod 22 on both sides of the first horizontal arm 21. The second horizontal arm 23 passes through the third guide rod 22. An end cap is provided at the end of the third guide rod 22 to prevent the second horizontal arm 23 from falling off. The blade holder is installed on the second horizontal arm 23. The second horizontal arm 23 can slide left and right along the third guide rod 22, thereby driving the two cutting blade assemblies 3 to clamp each other front and back. In addition, a return spring (not shown in the figure) is provided on the third guide rod 22 in the area between the two second horizontal arms 23, which is used to reset the two cutting blade assemblies 3 after they are clamped front and back. A rotating support shaft 24 is also provided on the first cross arm 21. The rotating support shaft 24 mainly serves as a support. A rotatable connecting rod frame 25 is provided on the rotating support shaft 24. The connecting rod frame 25 is mounted on the rotating support shaft 24 through bearings, so that the connecting rod frame 25 can rotate. Vertical shafts 231 are respectively provided on the second cross arms 23 on both sides. Connecting rod portions 251 are respectively provided on both sides of the connecting rod frame 25. A shaft hole is provided at the end of the connecting rod portion 251, so that the end of the connecting rod portion 251 is rotatably connected to the vertical shaft 231. The drive frame 2 also includes a second swing rod 26 for driving the connecting rod frame 25 to swing. A roller 261 is provided on the upper side of the end of the second swing rod 26. The second swing rod 26 is fastened to the connecting rod frame 25. When the second swing rod 26 swings, it can drive the connecting rod frame 25 to swing.

[0072] The working principle of the drive frame 2 of the steamed bun cutting mechanism is as follows: Combined with... Figure 1 As shown, Figure 1 This is a schematic diagram of the steamed bun forming device. Figure 1 The forming frame 400 of the steamed bun forming device is provided with a first longitudinal rod 401, a second longitudinal rod 402 and a third longitudinal rod 403. The first cross arm 21 of the drive frame 2 of the steamed bun cutting mechanism is mounted on the third longitudinal rod 403. The third longitudinal rod 403 is a fixed rod. The first longitudinal rod 401 and the second longitudinal rod 402 can be driven by the drive mechanism of the steamed bun forming device to move closer to each other. When the second longitudinal rod 402 moves, it can actuate the roller 261 at the end of the second swing rod 26, causing the second swing rod 26 to swing. The second swing rod 26 then drives the connecting rod frame 25 to swing. Under the action of the connecting rod frame 25, it can drive the two cutting blade assemblies 3 to clamp each other back and forth. When the first longitudinal rod 401 and the second longitudinal rod 402 are driven by the drive mechanism of the steamed bun forming device to move away from each other, under the action of the return spring located between the two second cross arms 23 on the third guide rod 22, the two cutting blade assemblies 3 move away from each other and reset.

[0073] Furthermore, in another embodiment, such as Figure 12 and Figure 15 As shown, the molding support of the steamed bun blank cutting mechanism includes a fourth guide rod 42 that can move up and down and is located at one end of the outer side of the first horizontal arm 21. Two fourth guide rods 42 are arranged side by side. The first horizontal arm 21 is provided with holes corresponding to the fourth guide rods 42. An end cap connected to the top of the first guide rod is provided at the top of the first horizontal arm 21. A second molding block 41 is located at the bottom of the fourth guide rod 42. A third spring 43 is sleeved on the fourth guide rod 42. The third spring 43 is sandwiched between the second molding block 41 and the bottom surface of the first horizontal arm 21.

[0074] When the steamed bun blank on the conveyor belt supported by the support plate at the bottom of the steamed bun machine, where the steamed bun blank cutting mechanism is located, contacts the bottom surface of the second molding block 41, the steamed bun blank can push the second molding block 41 upward. The second molding block 41, together with the fourth guide rod 42, moves upward, and the third spring 43 is compressed. After the steamed bun blank cutting mechanism completes the action of cutting the steamed bun blank, the conveyor belt supported by the support plate at the bottom descends, and the second molding block 41 is no longer subjected to upward resistance. Under the elastic action of the third spring 43, the second molding block 41 moves down and returns to its original position. Because the second molding block 41 can extend and retract vertically when subjected to force, the steamed bun blank on the conveyor belt supported by the support plate at the bottom and the second molding block 41 are in soft contact. The second molding block 41 can adaptively shape the top surface of the steamed bun blank, preventing the steamed bun blank from being flattened, and the vertical movement of the conveyor belt is more free.

[0075] Furthermore, in another embodiment, such as Figure 15 As shown, the two sides of the second molding block 41 of the steamed bun blank cutting mechanism are arc-shaped surfaces that match the inner side of the blade 31. When the two cutting blade assemblies 3 approach each other along the clamping direction, the inner side of the blade 31 matches the outer side of the second molding block 41, making the cavity formed between the blades 31 on both sides and the second molding block 41 at the top relatively regular. There is no gap between the inner side of the blade 31 and the outer side of the second molding block 41, which can better shape the steamed bun blank and prevent the sides of the steamed bun blank from being squeezed and deformed.

[0076] Furthermore, in another embodiment, such as Figure 12 and Figure 15-16 As shown, the second horizontal arm 23 of the steamed bun cutting mechanism is provided with a sliding sleeve 27 that matches the third guide rod 22. By setting the sliding sleeve 27, it is beneficial for the second horizontal arm 23 to slide smoothly on the third guide rod 22.

[0077] In addition, combined Figure 1 As shown, the first molding block assemblies 900 are staggered among the clamping rollers 500, the front vertical extrusion block 700, the rear vertical extrusion block 600, the steamed bun blank initial cutting clamp 100, the steamed bun blank cutting mechanism 200, and the rolling roller mechanism 800.

[0078] For example, such as Figure 12 As shown, first molding assemblies 900 are respectively provided on the front and rear sides of the dough cutting mechanism 200. The first molding assemblies 900 are respectively located on the front and rear sides of the two cutting assemblies 3. The first molding assembly 900 includes a first molding block at the bottom and a second molding support at the top. The bottom of the first molding block is an upwardly arched arc-shaped bottom surface. The structure of the first molding assembly 900 is similar to that of the second molding block assembly 4 mentioned earlier, and its structure will not be described in detail here. By providing first molding assemblies 900 on the front and rear sides of the dough cutting mechanism 200, the purpose is to press down the adjacent dough pieces on both sides of the dough piece below the dough cutting mechanism when the dough cutting mechanism is working, to prevent the dough pieces on both sides from being pulled and displaced during the operation of the dough cutting mechanism. It also has the function of shaping the top surface of the dough piece.

[0079] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0080] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steamed bun forming device, comprising a forming frame, wherein a pressing and shaping mechanism, a steamed bun cutting mechanism, and a rolling roller mechanism are arranged from front to back on the forming frame, and multiple sets of first molding block assemblies for shaping the top of the steamed bun are also provided on the forming frame, characterized in that: A dough shaping gripper is provided on the forming frame behind the rolling roller mechanism. The dough shaping gripper includes a support frame, on which a first guide rod and a second guide rod are arranged in a cross pattern. Gripper assemblies are provided on both sides of the first guide rod and the second guide rod. A drive assembly is provided on the support frame to drive the gripper assemblies to move along the first guide rod or the second guide rod, so that the four gripper assemblies can retract or open. Each gripper assembly includes a gripper bracket and a shaping clamping plate. The shaping clamping plate is located at the bottom of the gripper bracket, and the inner surface of the shaping clamping plate is an arc-shaped surface. The gripper bracket includes a vertical rod, the top of which is provided with a movable slider corresponding to the first guide rod or the second guide rod, the bottom of which is provided with a horizontal bar, and the rear side of the shaping clamp is provided with a clamping plate connecting rod that intersects with the horizontal bar. The clamping plate connecting rod is connected to the horizontal bar via an adjustable connecting component. A central pressure plate is also provided at the bottom of the support frame, and the central pressure plate is located between the four gripper assemblies. A steamed bun blank initial cutting gripper is also provided on the forming frame between the pressing and shaping mechanism and the steamed bun blank cutting mechanism. The steamed bun blank initial cutting gripper includes two gripper assemblies arranged opposite to each other. The gripper assembly includes a vertical blade and a blade handle. The vertical blade is mounted on the blade handle, and a first spring is provided between the vertical blade and the blade handle, so that the vertical blade can extend and retract on the blade handle when it is subjected to force. The vertical blade includes a blade body, and a vertical blade edge is provided on one side of the blade body. A pressing blade edge is provided on the side of the blade edge. The steamed bun cutting mechanism includes a drive frame with two blade assemblies for clamping each other. The drive frame drives the two blade assemblies to move closer or further apart along the clamping direction. Each blade assembly includes a blade with its inner side curved outwards into an arc shape. The bottom of the blade has a cutting edge, and the top of the blade is mounted on the drive frame via a blade holder. The mechanism also includes a second molding block assembly, which includes a second molding block and a molding support. The two sides of the second molding block are arc-shaped surfaces that match the inner sides of the blades. The second molding block is mounted on the molding support and positioned between the two blades. The bottom of the second molding block is an upwardly arched arc-shaped bottom surface. The pressing and shaping mechanism includes clamping rollers and vertical extrusion blocks arranged at intervals. Each of the first molding block components is staggered among the clamping rollers, vertical extrusion blocks, steamed bun blank initial cutting clamps, steamed bun blank cutting mechanism, and rolling roller mechanism.

2. The steamed bun forming device according to claim 1, characterized in that: The drive assembly includes a rotating disk mounted on the support frame. The rotating disk has four arc-shaped guide grooves, and each of the gripper brackets is provided with a guide wheel. The guide wheel is correspondingly mounted in the guide groove. The drive assembly also includes a first swing rod connected to the rotating disk. The first swing rod is used to drive the rotating disk to rotate back and forth.

3. The steamed bun forming device according to claim 1, characterized in that: The blade body of the vertical blade is provided with a handle guide hole that matches the handle. The lower part of the handle is disposed in the handle guide hole. A bottom cover connected to the handle is provided at the bottom of the blade body. A spring groove is provided on the handle. The first spring is disposed in the spring groove. The upper middle part of the handle guide hole is enlarged into a spring hole that matches the first spring.

4. The steamed bun dough forming device according to claim 1, characterized in that: The lower end of the blade extends downward relative to the blade body; the bottom surface of the blade is flat; the extrusion blade is an arc-shaped blade.

5. The steamed bun forming device according to claim 1, characterized in that: The blade holder includes a guide block and a telescopic slider. The guide block has a guide hole that matches the telescopic slider. The upper part of the telescopic slider is disposed in the guide hole. The top of the guide block has an upper end cap that is connected to the telescopic slider. A second spring is provided between the guide block and the telescopic slider. The top of the blade is connected to the telescopic slider.

6. The steamed bun forming device according to claim 1, characterized in that: The drive frame includes a first horizontal arm, on which a third guide rod in the front-rear direction is provided. Second horizontal arms are respectively provided on both sides of the first horizontal arm via the third guide rod, and the blade holder is mounted on the second horizontal arms. A rotating support shaft is also provided on the first horizontal arm, and a rotatable linkage frame is provided on the rotating support shaft. Vertical shafts are respectively provided on the second horizontal arms on both sides. The linkage frame has two connecting rods respectively rotatably connected to the vertical shafts. The drive frame also includes a second swing rod for driving the linkage frame to swing. The molding support includes a fourth guide rod that can move up and down and is disposed at one end of the first cross arm. The second molding block is disposed at the bottom of the fourth guide rod, and a third spring is sleeved on the fourth guide rod. The third spring is sandwiched between the second molding block and the first cross arm.

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