Quick-change cutter device capable of controlling contact force

Abstract

The application provides a quick-change cutter device capable of controlling contact force, which is applied to the technical field of cutters and comprises a rotary motion assembly, a non-rotary motion assembly and a motor in transmission cooperation with the rotary motion assembly; the rotary motion assembly comprises a transmission head II, a transmission key, a spring seat, a spring II and an outer shell, the outer wall of the outer shell is provided with a cutter assembly; the transmission key is connected with the spring seat, a key groove matched with the transmission key is formed in the outer shell, and the upper end surface of the transmission key is kept in contact with the end surface of the key groove in the outer shell under the pre-compression force of the spring II; the non-rotary motion assembly comprises a shaft sleeve connected with the shaft in alignment, the shaft is connected with a mold, the taper of the shaft sleeve is the same as the taper of the shaft, and the taper angle of the shaft sleeve is smaller than the friction angle between the shaft and the shaft sleeve; the elastic force of the spring II is used for buffering the axial force of the material extruded by the mold to the cutter assembly, so that the contact force between the cutter assembly and the end surface of the mold is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cutting knives, and particularly relates to a quick-change cutting knife device capable of controlling contact force. BACKGROUND

[0002] The puffing machine is widely used in the fields of feed, food, plastic and battery slurry, and its main working principle is to convert mechanical energy into heat energy, that is, the heat generated by the rotation of the machine is used to extrude and cook the food or feed. For example, in the application of the puffing machine in the production process of feed, the material is uniformly mixed and cooked by extruding and rubbing the material by the screw, and then is extruded through the die hole. After extrusion, the material is puffed due to the expansion of gas. The material extruded from the die hole needs to be cut into small particles immediately, and the cutting effect directly affects the quality of the particles and also affects the subsequent drying and spraying effect.

[0003] The cutting knife of the puffing machine is made of high-hardness elastic material. During production, the blade is tightly attached to the die and rotates at a high speed (1500 rpm). Therefore, the cutting knife inevitably wears and deforms. When the blade wears or deforms to a certain extent, it needs to be replaced. The replacement of the cutting knife assembly generally takes tens of minutes to several tens of minutes. After the puffing machine production line is started, it generally needs to run for tens of minutes to several tens of minutes to reach a stable state. During this period, the produced feed is waste.

[0004] A Chinese invention patent with publication number CN117817754A discloses a puffing machine cutting knife quick-change device, an assembly method thereof and a cutting knife quick-change method, relating to a cutting knife quick-change structure, which comprises a taper shaft fixed at the end of the die of the puffing machine, a quick-change cutting knife assembly connected to the taper shaft, and a motor cooperating with the quick-change cutting knife assembly. The driving end of the motor is provided with a transmission head one. The quick-change cutting knife assembly comprises a transmission head two connected with the transmission head one, a rotating movement component rotating under the drive of the transmission head two, and a taper sleeve connected with the rotating movement component and used for sleeving the taper shaft. The rotating movement component comprises a blade, which abuts against the end face of the die to cut the material extruded from the die hole. The axis of the taper shaft is coaxial with the axis of the die and perpendicular to the end face of the die. The taper angles of the taper shaft and the taper sleeve are the same, and the taper angle is smaller than the friction angle between the taper shaft and the taper sleeve. The present application can complete the replacement of the cutting knife device within tens of seconds, and even without stopping the machine.

[0005] Although the above-mentioned patent can realize the quick replacement of the cutting knife, the cutting knife and the die are in rigid contact, the contact force between the cutting knife and the die cannot be accurately controlled, and the contact force cannot be adjusted according to the discharge load of the die. If the contact force is too large, the cutting knife will deform and wear quickly. The deformed and worn cutting knife will separate from the end face of the die, thereby affecting the cutting effect. SUMMARY

[0006] In view of the above problems in the prior art, the present application aims to provide a quick-change cutting tool device capable of controlling the contact force between the cutting tool and the end face of the mold, thereby reducing the wear of the cutting tool, prolonging the service life of the cutting tool, and reducing the frequency of downtime for tool replacement.

[0007] A quick-change cutting tool device capable of controlling the contact force, comprising a rotating motion assembly, a non-rotating motion assembly, and a motor in transmission cooperation with the rotating motion assembly.

[0008] The rotating motion assembly comprises a transmission head II, a transmission key, a spring seat, a spring II, and a housing, the outer wall of the housing is provided with a cutting tool assembly, the inner part of the housing is divided into a first chamber and a second chamber, and the first chamber and the second chamber are in communication in the axial direction.

[0009] The transmission key is connected with the spring seat, a key groove adapted to the transmission key is formed on the housing, one end of the spring II is in contact with the spring seat, and the other end is in contact with the bottom wall of the second chamber of the housing, and under the pre-compression force of the spring II, the upper end surface of the transmission key is in contact with the end surface of the key groove on the housing.

[0010] The non-rotating motion assembly comprises a shaft sleeve in alignment connection with the shaft, the shaft is connected with the mold, the taper of the shaft sleeve is the same as that of the shaft, and the taper angle of the shaft sleeve is smaller than the friction angle between the shaft and the shaft sleeve, and after the alignment connection of the shaft and the shaft sleeve, the cutting tool assembly is in contact with the end face of the mold.

[0011] One end of the housing is provided with the transmission head II, the transmission head II is in transmission connection with the transmission head I, and the transmission head I is connected with the driving end of the motor.

[0012] The elastic force of the spring II is used for buffering the axial force of the material extruded by the mold to the cutting tool assembly, reducing the contact force between the cutting tool assembly and the end face of the mold, and adjusting the contact force between the cutting tool assembly and the end face of the mold by controlling the displacement of the spring II.

[0013] Preferably, the non-rotating motion assembly further comprises a spring I, a spring pin, and an oil-free bushing, the oil-free bushing is sleeved with the shaft sleeve, the oil-free bushing is installed on the housing through the rolling bearing II, the spring pin is connected with the spring seat through the rolling bearing I, one end of the spring I is in contact with the spring pin, and the other end is in contact with the shaft sleeve; under the pre-compression force of the spring I, the end surface of the oil-free bushing is in contact with the shoulder of the shaft sleeve, so that the shaft sleeve always protrudes out of the housing.

[0014] Preferably, the transmission key, the spring seat, the spring II, and the spring pin are located in the second chamber, the shaft sleeve and the oil-free bushing are located in the first chamber of the housing, and the spring I is located at the communication between the first chamber and the second chamber.

[0015] Preferably, one end of the transmission head two is located in the interior of the shell and abuts against the spring seat, and the spring seat and the corresponding position on the transmission head two are provided with a groove for clamping the transmission key;

[0016] The other end of the transmission head two coaxially engages with the transmission head one, the transmission head two comprises a central engagement column, an engagement tooth one arranged around the engagement column, and a guide surface one arranged on the engagement tooth one, and the transmission head one comprises an insertion hole matched with the engagement column, an engagement tooth two matched with the engagement tooth one, and a guide surface two matched with the guide surface one.

[0017] Preferably, the axis of the shaft is coaxial with the axis of the mold and perpendicular to the end surface of the mold.

[0018] Preferably, the cutter assembly comprises a cutter rod, a cutter, and a pressing plate, one end of the cutter rod is detachably connected with the shell, and the other end is detachably installed with the cutter through the pressing plate, and the pressing plate is used for pressing the cutter on the cutter rod.

[0019] The beneficial effects of the present application are that the quick-change cutter device with controllable contact force divides the interior of the shell into a first chamber and a second chamber, and makes the first chamber and the second chamber communicate in the axial direction, and the spring two is arranged in the second chamber of the shell, and the structural design among the spring two, the transmission key, and the spring seat enables the elastic force of the spring two to adjust the contact force between the cutter assembly and the end surface of the mold, thereby avoiding excessive or insufficient contact force, reducing the wear of the cutter, prolonging the service life of the cutter, and reducing the frequency of downtime for tool replacement. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, illustrate the application, and are used to explain the application without limiting the application. In the drawings:

[0021] Fig. 1 is a sectional view of the mold connected with the present application;

[0022] Fig. 2 is a sectional view of the interior of the shell of the present application;

[0023] Fig. 3 is an exploded view of the present application.

[0024] In the drawings, 1 is a mold, 2 is a shaft, 3 is an oil-free bushing, 4 is a shaft sleeve, 5 is a spring one, 6 is a spring pin, 7 is a shell, 8 is a rolling bearing two, 9 is a spring two, 10 is a spring seat, 11 is a transmission key, 12 is a transmission head two, 13 is a transmission head one, 14 is a motor, 15 is a rolling bearing one, 16 is a cutter rod, 17 is a cutter, and 18 is a pressing plate. DETAILED DESCRIPTION

[0025] Example 1

[0026] like Figs. 1 to 3 As shown, a quick-change cutter device with controllable contact force includes a rotary motion component, a non-rotational motion component, and a motor 14 that is driven and coordinated with the rotary motion component.

[0027] On one hand, the rotary motion assembly includes a second transmission head 12, a transmission key 11, a spring seat 10, a second spring 9, and a housing 7. The outer wall of the housing 7 is equipped with a cutter assembly. The interior of the housing 7 is divided into a first chamber and a second chamber, which are connected in the axial direction.

[0028] The transmission key 11, spring seat 10, and spring 9 are located in the second chamber. The transmission key 11 is connected to the spring seat 10. The outer shell 7 has a keyway adapted to the transmission key 11. One end of the spring 9 contacts the spring seat 10, and the other end contacts the bottom wall of the second chamber of the outer shell 7.

[0029] Under the pre-compression force of spring 29, the upper end face of the transmission key 11 remains in contact with the end face of the keyway on the outer casing 7. At this time, the pre-compression force F of spring 29 is... 20 =k2·x 20 .

[0030] On the other hand, the non-rotating motion component includes a spring 5, a spring pin 6, a bushing 4, and an oil-free bushing 3. The bushing 4 and the oil-free bushing 3 are located in the first cavity of the housing 7. The oil-free bushing 3 is sleeved with the bushing 4 and is mounted on the housing 7 via a rolling bearing 8. The spring pin 6 is located in the second cavity of the housing 7 and is connected to the spring seat 10 via a rolling bearing 15. The spring 5 is located at the connection between the first and second cavities. One end of the spring 5 contacts the spring pin 6, and the other end contacts the bushing 4.

[0031] Under the pre-compression force of spring 5, the end face of the oilless bushing 3 remains in contact with the shoulder of the bushing 4, ensuring that the bushing 4 always extends out of the outer casing 7. The pre-compression force F of spring 5... 10 =k1×x 10 .

[0032] Further, one end of the transmission head two 12 is located inside the shell 7 and abuts against the spring seat 10, and the other end of the transmission head two 12 is in transmission connection with the transmission head one 13, which is connected with the driving end of the motor 14. The other end of the shell 7 is connected with the shaft 2 through the shaft sleeve 4, so that the cutter assembly is in contact with the mold 1. The shaft 2 is connected with the mold 1, and the axis of the shaft 2 is coaxial with the axis of the mold 1 and perpendicular to the end surface of the mold 1. The motor 14 drives the transmission head one 13 and the transmission head two 12 to rotate, thereby driving the cutter assembly on the shell 7 to rotate, so that the cutter assembly cuts the material extruded from the mold 1.

[0033] Specifically, one end of the transmission head two 12 is located inside the shell 7 and abuts against the spring seat 10, and the corresponding positions of the spring seat 10 and the transmission head two 12 are provided with grooves for clamping the transmission key 11.

[0034] The other end of the transmission head two 12 is coaxially engaged with the transmission head one 13. The transmission head two 12 includes a central engagement column, an engagement tooth one arranged around the engagement column, and a guide surface one arranged on the engagement tooth one. The transmission head one 13 includes an insertion hole matched with the engagement column, an engagement tooth two matched with the engagement tooth one, and a guide surface two matched with the guide surface one.

[0035] The taper of the shaft sleeve 4 is the same as the taper of the shaft 2, and the taper angle of the shaft sleeve 4 is smaller than the friction angle between the shaft 2 and the shaft sleeve 4. Therefore, once the shaft sleeve 4 is installed on the shaft 2 and tightly fitted, the shaft sleeve 4 and the shaft 2 are frictionally locked through frictional force, so that the cutter device cannot fall off the shaft 2.

[0036] The cutter assembly includes a cutter rod 16, a cutter 17, and a pressing plate 18. One end of the cutter rod 16 is detachably connected with the shell 7, and the other end is detachably installed with the cutter 17 through the pressing plate 18. The pressing plate 18 is used to press the cutter 17 on the cutter rod 16.

[0037] The elastic force of the spring two 9 is used to buffer the axial force of the material extruded from the mold 1 to the cutter assembly, so as to reduce the contact force between the cutter assembly and the end surface of the mold 1. The contact force between the cutter assembly and the end surface of the mold 1 is adjusted by controlling the displacement of the spring two 9.

[0038] Working principle: the quick-change cutter device with controllable contact force is used in the following way:

[0039] The quick-change cutter device is installed on the shaft 2 through the alignment connection of the shaft sleeve 4 and the shaft 2. At this time, the distance between the cutter assembly and the mold 1 is x1.

[0040] The mobile motor 14 engages the transmission head one 13 and the transmission head two 12 and adjusts the engagement angle; the spring one 5 buffers the impact between the transmission head one 13 and the transmission head two 12, and the rotating motion assembly rotates under the elasticity of the spring one 5, so that the angle of engagement of the transmission head one 13 and the transmission head two 12 is correct.

[0041] The mobile motor 14 continues to compress the spring one 5 until the cutter assembly contacts the end face of the mold 1. It should be noted that the compression amount of the spring two 9 remains unchanged before the cutter assembly contacts the end face of the mold 1, and the compression amount of the spring one 5 is x+x1 after the cutter assembly contacts the end face of the mold 1. 10 The spring force F of the spring one 5 is k1·(x+x1). 12 10 The mobile motor 14 continues to compress the spring one 5 until the cutter assembly contacts the end face of the mold 1. It should be noted that the compression amount of the spring two 9 remains unchanged before the cutter assembly contacts the end face of the mold 1, and the compression amount of the spring one 5 is x+x1 after the cutter assembly contacts the end face of the mold 1.

[0042] The mobile motor 14 continues to compress the spring one 5 until the cutter assembly contacts the end face of the mold 1. It should be noted that the compression amount of the spring two 9 remains unchanged before the cutter assembly contacts the end face of the mold 1, and the compression amount of the spring one 5 is x+x1 after the cutter assembly contacts the end face of the mold 1. 22 The spring force F of the spring one 5 is k1·(x+x1). 20 +x2), wherein x is the pre-compression amount of the spring two 9, and x2 is the displacement of the transmission key 11 relative to the shell 7, i.e. the compression amount of the spring two 9 being compressed again. 20

[0043] When the cutter 17 wears, the cutter 17 can automatically move forward under the action of the spring two 9 to compensate for the wear, so that the cutter 17 always maintains contact with the end face of the mold 1.

[0044] In addition, when the cutter assembly is installed, the extruder has not started working, so the end face of the mold 1 does not have a discharge load. If the cutter 17 is in contact with the end face of the mold 1 at this time, i.e. there is no contact force between the two, when the extruder is in a working state, the discharge load of the end face of the mold 1 will extrude the cutter 17 to increase the contact force between the cutter 17 and the end face of the mold 1, causing the cutter 17 to deform and thus accelerating the wear of the cutter 17.

[0045] Therefore, the spring two 9 needs to be further compressed when the cutter assembly is installed, so that the transmission key 11 is separated from the shell 7, and the second chamber of the shell 7 has a distance of x2 for the spring two 9 to adjust the length, so that the spring two 9 can adjust its length according to the size of the discharge load when the mold 1 discharges, thereby adjusting the contact force between the cutter 17 and the end face of the mold 1, and reducing the wear of the cutter 17 by the mold 1 when the extruder is working normally.

[0046] ​​When the external device of the die 1 is in stable operation, the material extruded from the die 1 impacts on the cutter assembly, giving the cutter assembly an axial force F. In the embodiment, the pre-compression force of the spring 2 is smaller than the axial force F when the bulking machine is in operation, so that the secondary compression amount x2 of the spring 2 is greater than 0 and as small as possible when the cutter is adjusted, and the spring 2 adjusts the contact force between the cutter 17 and the end face of the die 1 by the elastic force when the bulking machine is in normal operation.

[0047] Ideally, when F=F 22 , the contact force between the cutter assembly and the die 1 is 0, which can avoid the wear caused by the friction between the cutter 17 and the die 1. Normally, there is a contact force between the cutter 17 and the end face of the die 1, and the cutter 17 will be worn after long-term use. The cutter 17 can be moved forward by the elastic force of the spring 2, so that the cutter 17 is always in contact with the end face of the die 1.

[0048] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments or equivalently replace some technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A quick-change cutter device with controllable contact force, characterized in that, Includes rotary motion components, non-rotary motion components, and motors that drive and cooperate with the rotary motion components (14); The rotary motion assembly includes a second transmission head (12), a spring seat (10), a second spring (9), and a housing (7). A cutter assembly is installed on the outer wall of the housing (7). The interior of the housing (7) is divided into a first chamber and a second chamber, which are connected in the axial direction. One end of the outer shell (7) is provided with a transmission head two (12) driven and connected by a motor (14). The transmission head two (12) is connected to the spring seat (10) for transmission. The spring seat (10) is provided with a transmission protrusion for transmitting rotational torque. The outer shell (7) is provided with a hole adapted to the transmission protrusion. The length of the hole is configured to allow the transmission protrusion to move axially. One end of the second spring (9) is in contact with the spring seat (10), and the other end is in contact with the bottom wall of the second chamber of the outer shell (7). Under the pre-compression force of the second spring (9), the upper end face of the transmission protrusion is in contact with the end face of the upper hole of the outer shell (7). The non-rotating motion component includes a shaft (2) and a bushing (4) that are inserted into each other. After being squeezed by the second transmission head (12), the bushing (4) is kept away from the rotational motion of the rotating motion component by the frictional force formed between it and the shaft (2) of the mold (1). The elastic force of the second spring (9) is used to buffer the axial force of the material extruded from the mold (1) to the cutter assembly, reduce the contact force between the cutter assembly and the end face of the mold (1), and adjust the contact force between the cutter assembly and the end face of the mold (1) by controlling the displacement of the second spring (9). The taper of the bushing (4) is the same as that of the shaft (2), and the taper angle of the bushing (4) is smaller than the friction angle between the shaft (2) and the bushing (4). After the shaft (2) and the bushing (4) are aligned and connected, the cutter assembly contacts the end face of the mold (1). The transmission protrusion is a transmission key (11), and the transmission head (12) is connected to the spring seat (10) via the transmission key (11). The non-rotating motion component also includes a spring (5), a spring pin (6) and a bearing. A bearing is installed between the bushing (4) and the outer shell (7). The spring pin (6) is connected to the spring seat (10) through a rolling bearing (15). One end of the spring (5) is in contact with the spring pin (6) and the other end is in contact with the bushing (4). The bearing includes an oilless bushing (3) and a rolling bearing (8). The oilless bushing (3) is sleeved with the bushing (4). The oilless bushing (3) is installed on the outer shell (7) through the rolling bearing (8). Under the pre-compression force of the spring (5), the end face of the oilless bushing (3) is in contact with the shoulder of the bushing (4), so that the bushing (4) always extends out of the outer shell (7). One end of the transmission head (12) is located inside the outer shell (7) and abuts against the spring seat (10). The spring seat (10) and the corresponding position of the transmission head (12) are provided with grooves that engage with the transmission key (11). The other end of the second transmission head (12) is coaxially meshed with the first transmission head (13). The second transmission head (12) includes a meshing post arranged in the center, a meshing tooth arranged around the meshing post, and a guide surface arranged on the meshing tooth. The first transmission head (13) includes an insertion hole adapted to the meshing post, a meshing tooth that meshes with the meshing tooth, and a guide surface that adapts to the guide surface.

2. The quick-change cutter device with controllable contact force according to claim 1, characterized in that, The transmission protrusion, spring seat (10), spring two (9), and spring pin (6) are located in the second chamber, the bushing (4) and the oil-free bushing (3) are located in the first chamber of the outer shell (7), and the spring one (5) is located at the connection between the first chamber and the second chamber.

3. The quick-change cutter device with controllable contact force according to claim 1, characterized in that, One end of the second transmission head (12) is connected to the outer shell (7), and the other end is connected to the first transmission head (13). The first transmission head (13) is connected to the drive end of the motor (14).

4. The quick-change cutter device with controllable contact force according to claim 1, characterized in that, The axis of the shaft (2) is coaxial with the axis of the mold (1) and perpendicular to the end face of the mold (1).

5. The quick-change cutter device with controllable contact force according to claim 1, characterized in that, The cutter assembly includes a cutter bar (16), a cutter (17) and a pressure plate (18). One end of the cutter bar (16) is detachably connected to the housing (7), and the other end is detachably mounted with the cutter (17) via the pressure plate (18). The pressure plate (18) is used to press the cutter (17) onto the cutter bar (16).

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