Adjustable quantitative feeding device

Abstract

The utility model relates to an adjustable quantitative feeding device which comprises a base, a plurality of sets of feeding pieces arranged on the base at equal intervals, a plurality of sets of conveying pieces arranged on the base at equal intervals, a plurality of sets of conveying pieces arranged on the base at equal intervals, a plurality of sets of conveying pieces arranged on the base at equal intervals, and a plurality of sets of conveying pieces arranged on the base at equal intervals, the driving assembly comprises a fixing plate, a fixing column, a first connecting rod, a second connecting rod, a universal joint, a fixing frame, a ratchet wheel assembly and two groups of gears; the device is connected with a crankshaft of a punching machine, so that when the crankshaft drives an upper die to move upwards to reset, an upper pressing roller and a lower pressing roller are driven to rotate to feed a steel plate, and when the crankshaft drives the upper die to move downwards to punch the steel plate, the steel plate stops moving; in this way, the smoothness and stability of matched operation during plate feeding and punching can be guaranteed, meanwhile, the device is simple in structure, the feeding and discharging frequency of the steel plate can be matched with the operation frequency of a punching machine without additionally installing a driving source and an electric control assembly, and practicability is high.

Description

Technical Field

[0001] The present application relates to the technical field of plate processing, and in particular to an adjustable quantitative feeding device. Background Art

[0002] At present, when stamping is required for sheet metal parts, they are generally produced by stamping and forming through a punch press. The design principle of the punch press is to convert circular motion into linear motion. The main motor drives the flywheel, which drives the gears, crankshaft, connecting rods, etc. through the clutch to achieve the linear motion of the slider, thereby driving the upper mold to move through the slider, so that the upper mold can cut and extrude the sheet metal after moving down through the cooperation with the lower mold.

[0003] In the related art, when stamping plates, steel coils are generally used as feeders. In order to ensure that the punch press can perform continuous stamping operations, manufacturers generally install a feeding device on one side of the punch press, and use the feeding device to feed the steel plates in stages and in a quantitative manner. Generally, an electronic control component, a drive component and a plurality of feeding rollers are installed in the feeding device. The driving component drives the feeding rollers to rotate and feed the steel plates. At the same time, in order to control the frequency of feeding the steel plates, the electronic control component is used to control the speed and start and stop time of the feeding rollers, so that the steel plates can better match the operating frequency of the punch press when feeding.

[0004] However, in actual use, controlling the frequency of steel plate feeding through electronic control components is not only inconvenient for subsequent debugging and maintenance, but also has high costs and is very inconvenient to use.

[0005] In view of the above problems, an adjustable quantitative feeding device is now designed. Utility Model Content

[0006] The embodiment of the present application provides an adjustable quantitative feeding device to solve the problem in the related art that the frequency of steel plate feeding is controlled by an electronic control component, which is not only inconvenient for subsequent debugging and maintenance, but also has a high cost.

[0007] In a first aspect, an adjustable quantitative feeding device is provided, comprising:

[0008] Base:

[0009] A feeding piece, which is provided with a plurality of groups, wherein the plurality of feeding pieces are equidistantly arranged on the base, wherein the feeding piece comprises an upper pressing roller and a lower pressing roller, and the upper pressing roller and the lower pressing roller are both rotatably arranged on the base;

[0010] The driving assembly comprises a fixed plate, a fixed column, a first connecting rod, a second connecting rod, a universal joint, a fixed frame, a ratchet assembly and two groups of gears, the two groups of gears are arranged on one group of feeding parts, the two groups of gears are respectively sleeved on the upper pressure roller and the lower pressure roller, the two groups of gears are meshed with each other, one end of the fixed frame is sleeved on the lower pressure roller installed with the gear, the fixed frame is rotatably connected with the lower pressure roller, the lower end of the second connecting rod is rotatably connected with the end of the fixed frame away from the lower pressure roller, one end of the universal joint is connected with the upper end of the second connecting rod, the lower end of the first connecting rod is connected with the other end of the universal joint, the fixed plate is used to be installed on the crankshaft of the punch press, the fixed column is arranged on the fixed plate, the upper end of the first connecting rod is sleeved on the fixed column and rotatably connected thereto, the ratchet assembly is arranged on the fixed frame and connected to the lower pressure roller installed with the gear, when the fixed frame rotates with the axis of the lower pressure roller as the axis, the lower pressure roller is driven to rotate unidirectionally through the ratchet assembly.

[0011] In some embodiments, the ratchet assembly includes a ratchet body, a first pawl, a second pawl, a first tension spring and a second tension spring. The ratchet body is sleeved on a lower pressure roller on which a gear is installed. The first pawl and the second pawl are distributed in a ring shape on both sides of the ratchet body. The first pawl is rotatably set on a fixed frame and cooperates with the ratchet body. The two ends of the first tension spring are respectively connected to the first pawl and the fixed frame. The second pawl is rotatably set on a base and cooperates with the ratchet body. The two ends of the second tension spring are respectively connected to the second pawl and the base.

[0012] In some embodiments, the fixing column is slidably disposed on the fixing plate.

[0013] In some embodiments, the fixing plate is provided with a guide groove;

[0014] The fixing column includes a bolt, a limit block and two groups of nuts. The limit block is slidably set in a guide groove. The bolt passes through the limit block and the first connecting rod and is rotatably connected to the first connecting rod. The two groups of nuts are both sleeved on the bolt and threadedly connected to the bolt. The two groups of nuts are respectively located on both sides of the first connecting rod.

[0015] Some embodiments further include a hand wheel, which is disposed on one of the sets of gears.

[0016] The embodiment of the present application provides an adjustable quantitative feeding device, because the device can be connected with the crankshaft of the punch press, when the crankshaft drives the upper mold to move up and down, the fixed column is driven to rotate around the crankshaft through the fixed plate, so that when the fixed column rotates, the fixed frame is pulled by the first connecting rod, the universal joint and the second connecting rod to rotate up and down around the axis of the lower pressure roller, and at the same time, the upper pressure roller and the lower pressure roller are driven to rotate in one direction through the coordinated transmission with the ratchet assembly and the two sets of gears, so that when the crankshaft drives the upper mold to move up and reset, it drives the upper pressure roller and the lower pressure roller to rotate to feed the steel plate, and the crankshaft drives the upper mold to move down to press the steel plate When punching, the upper and lower pressure rollers stop rotating and the steel plate remains still to facilitate the punching operation. This linkage through a purely mechanical structure can not only ensure the smoothness and stability of the plate feeding and coordinated operation during punching, but also the device has a simple structure, can be used in harsh working environments, and is easy to maintain. The loading and unloading frequency of the steel plate can be matched with the operating frequency of the punch press without the need to install additional drive sources and electronic control components. It has low cost and is easy to install and operate. When in use, the length of each feeding of the steel plate can be adjusted as needed, which enhances the applicability of the device and its practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of a three-dimensional structure provided in an embodiment of the present application;

[0019] Figure 2 Provided in the embodiments of this application Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 3 A schematic diagram of a three-dimensional structure provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of the three-dimensional structure of a fixing column provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of the installation structure of the fixing plate and the fixing column provided in an embodiment of the present application.

[0023] In the figure: 1. base; 2. feeding part; 21. upper pressure roller; 22. lower pressure roller; 3. driving assembly; 31. fixing plate; 311. guide groove; 32. fixing column; 321. bolt; 322. limit block; 323. nut; 33. first connecting rod; 34. second connecting rod; 35. universal joint; 36. fixing frame; 37. ratchet assembly; 371. ratchet body; 372. first pawl; 373. second pawl; 374. first tension spring; 375. second tension spring; 38. gear; 4. handwheel. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0025] The embodiment of the present application provides an adjustable quantitative feeding device, which can solve the problem in the related art that the frequency of steel plate feeding is controlled by an electronic control component, which is not only inconvenient for subsequent debugging and maintenance, but also has a high cost.

[0026] See also Figure 1-Figure 3 , an adjustable quantitative feeding device, comprising: a base 1, a feeding member 2 and a driving assembly 3, wherein the feeding member 2 is provided with a plurality of groups, and the plurality of feeding members 2 are equidistantly arranged on the base 1, and the feeding member 2 comprises an upper pressing roller 21 and a lower pressing roller 22, and the upper pressing roller 21 and the lower pressing roller 22 are both rotatably arranged on the base 1;

[0027] The driving assembly 3 includes a fixed plate 31, a fixed column 32, a first connecting rod 33, a second connecting rod 34, a universal joint 35, a fixed frame 36, a ratchet assembly 37 and two groups of gears 38. The two groups of gears 38 are arranged on one group of the feeding members 2, and the two groups of gears 38 are respectively sleeved on the upper pressure roller 21 and the lower pressure roller 22. The two groups of gears 38 are meshed with each other. One end of the fixed frame 36 is sleeved on the lower pressure roller 22 on which the gear 38 is installed. The fixed frame 36 is rotatably connected to the lower pressure roller 22. The lower end of the second connecting rod 34 is rotatably connected to the end of the fixed frame 36 away from the lower pressure roller 22. One end of the universal joint 35 is connected to the upper end of the second connecting rod 34, and the lower end of the first connecting rod 33 is connected to the other end of the universal joint 35.

[0028] The fixing plate 31 is used to be installed on the crankshaft of the punch press, the fixing column 32 is arranged on the fixing plate 31, the upper end of the first connecting rod 33 is sleeved on the fixing column 32 and is rotatably connected thereto, the ratchet assembly 37 is arranged on the fixing frame 36 and is connected to the lower pressing roller 22 equipped with a gear 38, when the fixing frame 36 rotates with the axis of the lower pressing roller 22 as the axis, the lower pressing roller 22 is driven to rotate in one direction through the ratchet assembly 37;

[0029] In this way, when the steel plate needs to be punched, the steel plate can be placed between the multiple upper pressing rollers 21 and the multiple lower pressing rollers 22, and the end of the steel plate can be placed on the punching machine, so that the steel plate can be limited by the multiple upper pressing rollers 21 and the lower pressing rollers 22;

[0030] Then, when the punch press is running to punch the steel plate, the crankshaft on the punch press will rotate, so that when the crankshaft on the punch press rotates, it will drive the fixed plate 31 to rotate, so that the fixed column 32 rotates around the crankshaft, so that when the fixed column 32 rotates, it will pull the fixed frame 36 to rotate up and down around the axis of the lower pressure roller 22 through the first connecting rod 33, the universal joint 35 and the second connecting rod 34;

[0031] In this way, when the crankshaft of the punch press rotates to drive the upper mold to move upward, the crankshaft will drive the fixed column 32 to rotate downward, so that the fixed column 32 will push the fixed frame 36 to rotate downward through the first connecting rod 33 and the second connecting rod 34, so that the fixed frame 36 will drive the lower pressure roller 22 to rotate through the ratchet assembly 37, and at the same time, the lower pressure roller 22 will drive the upper pressure roller 21 to reverse through the meshing transmission of two sets of gears 38, so that the steel coil can be conveyed through the cooperative extrusion of the upper pressure roller 21 and the lower pressure roller 22, so that when the upper mold moves upward, the steel coil can be quantitatively fed;

[0032] When the crankshaft drives the upper die to move downward, the crankshaft drives the fixed column 32 to rotate upward, so that the fixed column 32 drives the fixed frame 36 to rotate upward, and then the fixed frame 36 does not drive the lower pressing roller 22 to rotate through the one-way transmission of the ratchet assembly 37, so that the punch press does not load the steel plate when punching the steel plate;

[0033] In this way, the crankshaft drives the upper die to move upward and reset, and drives the upper pressing roller 21 and the lower pressing roller 22 to rotate to load the steel plate. At the same time, the steel plate will push the stamped plate from the punching machine during loading, thereby realizing automatic unloading of the workpiece. Then, when the crankshaft drives the upper die to move downward to stamp the steel plate, the upper pressing roller 21 and the lower pressing roller 22 can stop rotating, so that the steel plate remains stationary for convenient stamping operation.

[0034] In this way, the device can be linked with the punch press, and the loading and unloading frequency of the steel plate can be matched with the operating frequency of the punch press without installing a separate drive source and electronic control components. In this way, the linkage through a purely mechanical structure can not only ensure the smoothness and stability of the coordinated operation during the feeding and punching of the plate, but also the device has a simple structure, can be applied to harsh working environments, is easy to maintain, and has a lower cost than electronic control devices, is easy to install and operate, and has strong practicality;

[0035] At the same time, a universal joint 35 is provided between the first connecting rod 33 and the second connecting rod 34, so that the angle between the first connecting rod 33 and the second connecting rod 34 can be changed within a certain range, thereby meeting the power transmission of the device and avoiding the first connecting rod 33 and the second connecting rod 34 from getting stuck during the transmission process, thereby ensuring the smoothness of the device during operation.

[0036] See also Figure 2 In this embodiment, the ratchet assembly 37 includes a ratchet body 371, a first ratchet pawl 372, a second ratchet pawl 373, a first tension spring 374 and a second tension spring 375. The ratchet body 371 is sleeved on the lower pressure roller 22 on which the gear 38 is installed. The first ratchet pawl 372 and the second ratchet pawl 373 are distributed in a ring shape on both sides of the ratchet body 371.

[0037] The first pawl 372 is rotatably disposed on the fixing frame 36 and matched with the ratchet body 371, the two ends of the first tension spring 374 are respectively connected to the first pawl 372 and the fixing frame 36, the second pawl 373 is rotatably disposed on the base 1 and matched with the ratchet body 371, and the two ends of the second tension spring 375 are respectively connected to the second pawl 373 and the base 1;

[0038] In this way, through the elastic force of the first tension spring 374 and the second tension spring 375, the first pawl 372 and the second pawl 373 can always be closely attached to the ratchet body 371, so that the first pawl 372 and the second pawl 373 can better cooperate with the ratchet body 371;

[0039] In this way, when the crankshaft drives the upper mold to move upward and drives the fixing frame 36 to rotate downward, the fixing frame 36 drives the first pawl 372 to rotate downward, so that the first pawl 372 cooperates with the ratchet body 371, and the first pawl 372 will push the ratchet body 371 to rotate, and at the same time the second pawl 373 does not cooperate with the ratchet body 371, so that the ratchet body 371 will drive the lower pressure roller 22 to rotate, thereby feeding the steel plate;

[0040] When the crankshaft drives the upper mold to move downward and drives the fixing frame 36 to rotate upward, the fixing frame 36 drives the first pawl 372 to rotate upward, and the first pawl 372 will not cooperate with the ratchet body 371, thereby not driving the ratchet body 371 to rotate, so that the steel plate can remain stationary;

[0041] At the same time, the second pawl 373 will cooperate with the ratchet body 371 to limit and fix the ratchet body 371, so as to prevent the first pawl 372 from driving the ratchet body 371 to rotate through friction, causing the lower pressure roller 22 to rotate, and causing the steel plate to move back and affect the feeding accuracy of the steel plate. In this way, the length of the steel plate can be kept consistent each time it is fed, so that the accuracy of the steel plate feeding each time is guaranteed by the second pawl 373. In this way, the steel plate can be accurately and quantitatively fed through the cooperation of the first pawl 372 and the second pawl 373, which is highly practical.

[0042] See also Figure 4-Figure 5 Specifically, in this embodiment, the fixing column 32 is slidably disposed on the fixing plate 31;

[0043] In this way, when in use, the fixed column 32 can be made to slide on the fixed plate 31, so as to adjust the distance between the fixed column 32 and the axis of the crankshaft of the punch press. When the distance between the fixed column 32 and the axis of the crankshaft increases, the diameter of the fixed column 32 rotation increases, the swing amplitude of the fixed frame 36 becomes larger, and the range of motion of the first pawl 372 increases. In this way, when the first pawl 372 cooperates with the ratchet body 371 to drive the ratchet body 371 to rotate, the amplitude of the rotation of the ratchet body 371 becomes larger, so that the increase in the amplitude of the rotation of the lower pressure roller 22 will increase the length of each feeding of the steel plate;

[0044] On the contrary, when the distance between the fixed column 32 and the crankshaft axis is reduced, the diameter of the fixed column 32 is reduced, and the swing amplitude of the fixed frame 36 is reduced, which leads to a reduction in the rotation amplitude of the first pawl 372 and the ratchet body 371. In this way, the rotation amplitude of the lower pressing roller 22 is increased, which reduces the length of each feeding of the steel plate.

[0045] In this way, the length of each feeding of the steel plate can be adjusted by adjusting the distance between the fixed column 32 and the crankshaft axis, thereby enhancing the applicability of the device and making it highly practical.

[0046] More specifically, the fixing plate 31 is provided with a guide groove 311 , and the fixing column 32 includes a bolt 321 , a limit block 322 and two sets of nuts 323 ;

[0047] The limit block 322 is slidably disposed in the guide groove 311, the bolt 321 penetrates the limit block 322 and the first connecting rod 33 and is rotatably connected to the first connecting rod 33, the two sets of nuts 323 are both sleeved on the bolt 321 and threadedly connected thereto, and the two sets of nuts 323 are respectively located on both sides of the first connecting rod 33;

[0048] In this way, when in use, the staff can put the limit block 322 into the guide groove 311, and then screw one of the nuts 323 to move one of the nuts 323 through the threaded connection with the bolt 321, so as to fix the position of the bolt 321 through the cooperation and extrusion with the limit block 322, and then screw the other nut 323, so that the first connecting rod 33 can be installed and fixed by the two nuts 323, so that the position of the fixing column 32 can be fixed;

[0049] When it is necessary to adjust the position of the fixing column 32, the two nuts 323 are loosened, and then the limit block 322 is allowed to slide in the guide groove 311. After adjusting the position of the bolt 321, the two nuts 323 are tightened. This not only makes it convenient for the staff to adjust the distance between the bolt 321 and the crankshaft axis, but also allows the position of the bolt 321 to be adjusted steplessly, so that the staff can adjust the length of each steel plate loading according to needs, thereby enhancing the applicability of the device and facilitating use.

[0050] Furthermore, it also includes a hand wheel 4, which is arranged on one of the sets of gears 38;

[0051] In this way, before loading the steel plate, the staff can turn the hand wheel 4 to make the upper pressing roller 21 and the lower pressing roller 22 rotate through the meshing transmission of the two sets of gears 38, thereby driving the steel plate to move. In this way, before production, the staff can manually turn the hand wheel 4 to adjust the position of the steel plate in advance, so as to better load and stamp the steel plate, which is convenient for use;

[0052] It should be noted that during the feeding process, the lower pressure roller 22 drives the ratchet body 371 to rotate, and the ratchet body 371 will not cooperate with the first pawl 372 and the second pawl 373, so the staff will not be restricted when turning the hand wheel 4 to feed the steel plate;

[0053] At the same time, when the staff reverses the hand wheel 4 and needs to retract the steel plate, the staff can pry the first pawl 372 and the second pawl 373 apart to move them away from the ratchet body 371. In this way, the first pawl 372 and the second pawl 373 do not cooperate with the ratchet body 371, so that the lower pressure roller 22 can be reversed, driving the steel plate to retract in the opposite direction, thereby facilitating the staff to adjust the position of the steel plate.

[0054] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0055] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0056] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An adjustable quantitative feeding device, characterized in that: It includes: Base(1): A feeding piece (2), which is provided with a plurality of groups, wherein the plurality of feeding pieces (2) are equidistantly arranged on the base (1), wherein the feeding piece (2) comprises an upper pressing roller (21) and a lower pressing roller (22), wherein the upper pressing roller (21) and the lower pressing roller (22) are both rotatably arranged on the base (1); A driving assembly (3), comprising a fixed plate (31), a fixed column (32), a first connecting rod (33), a second connecting rod (34), a universal joint (35), a fixed frame (36), a ratchet assembly (37) and two groups of gears (38), wherein the two groups of gears (38) are arranged on one group of feeding members (2), the two groups of gears (38) are respectively sleeved on an upper pressure roller (21) and a lower pressure roller (22), the two groups of gears (38) are meshed with each other, one end of the fixed frame (36) is sleeved on a lower pressure roller (22) on which the gears (38) are installed, the fixed frame (36) is rotatably connected to the lower pressure roller (22), the lower end of the second connecting rod (34) and the fixed frame (36) are away from the lower pressure roller (22), one end of the universal joint (35) is rotatably connected to the upper end of the second connecting rod (34), the lower end of the first connecting rod (33) is connected to the other end of the universal joint (35), the fixed plate (31) is used to be installed on the crankshaft of the punch press, the fixed column (32) is arranged on the fixed plate (31), the upper end of the first connecting rod (33) is sleeved on the fixed column (32) and rotatably connected thereto, the ratchet assembly (37) is arranged on the fixed frame (36) and connected to the lower pressure roller (22) equipped with a gear (38), when the fixed frame (36) rotates with the axis of the lower pressure roller (22) as the axis, the ratchet assembly (37) drives the lower pressure roller (22) to rotate in one direction.

2. An adjustable quantitative feeding device as claimed in claim 1, characterized in that: The ratchet assembly (37) includes a ratchet body (371), a first pawl (372), a second pawl (373), a first tension spring (374) and a second tension spring (375). The ratchet body (371) is sleeved on a lower pressure roller (22) on which a gear (38) is installed. The first pawl (372) and the second pawl (373) are distributed in a ring shape on both sides of the ratchet body (371). The first pawl (372) is rotatably set on a fixed frame (36) and cooperates with the ratchet body (371). The two ends of the first tension spring (374) are respectively connected to the first pawl (372) and the fixed frame (36). The second pawl (373) is rotatably set on the base (1) and cooperates with the ratchet body (371). The two ends of the second tension spring (375) are respectively connected to the second pawl (373) and the base (1).

3. An adjustable quantitative feeding device as claimed in claim 1, characterized in that: The fixing column (32) is slidably arranged on the fixing plate (31).

4. An adjustable quantitative feeding device as claimed in claim 3, characterized in that: The fixing plate (31) is provided with a guide groove (311); The fixing column (32) comprises a bolt (321), a limit block (322) and two groups of nuts (323); the limit block (322) is slidably arranged in the guide groove (311); the bolt (321) passes through the limit block (322) and the first connecting rod (33) and is rotatably connected to the first connecting rod (33); the two groups of nuts (323) are both sleeved on the bolt (321) and threadedly connected thereto; the two groups of nuts (323) are respectively located on both sides of the first connecting rod (33).

5. The adjustable quantitative feeding device according to claim 1, characterized in that: It also comprises a hand wheel (4), wherein the hand wheel (4) is arranged on one of the sets of gears (38).

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