Amplitude adjusting mechanism for variable amplitude fascia gun

Abstract

The utility model discloses an amplitude adjusting mechanism for a variable amplitude fascia gun in the field of massage equipment, which comprises an executing mechanism and an input mechanism which are arranged between a swing arm and an eccentric wheel, the executing mechanism comprises a driving block and a sliding block, and the sliding block is arranged on the eccentric wheel in a sliding mode through a limiting guide structure. The swing arm is rotationally connected with the sliding block, the driving block drives the sliding block to slide through a sliding fit structure, the distance from a rotating shaft of the sliding block and the swing arm to a rotating shaft of the motor is changed, and the input mechanism drives the driving block to move without limiting rotation of the driving block along with the eccentric wheel. The motor and the eccentric distance adjusting mechanism are arranged on the two sides of the eccentric wheel respectively, so that the motor and the eccentric distance adjusting mechanism are assembled independently and do not affect each other, assembly, overhaul and maintenance are convenient, and cost is low. And then the movement is converted into the radial movement of the sliding block along the eccentric wheel under the matching of the inclined surface, so that the stepless adjustment of the eccentric distance is realized.

Description

Technical Field

[0001] The utility model relates to the field of massage equipment, in particular to an amplitude regulating mechanism for a variable amplitude fascia gun. Background Art

[0002] The fascia gun, also known as the deep myofascial impactor, is a soft tissue massage tool that relaxes the body's soft tissues through high-frequency impacts. The existing fascia gun drives the massage head to make linear reciprocating motion through the piston. The massage head contacts the human body and generates high-frequency vibrations that act on the deep muscles, which reduces local tissue tension, relieves pain, and promotes blood circulation.

[0003] The limit distance of the reciprocating motion of the massage head is called the amplitude of the fascia gun. The amplitude is not the larger the better nor the smaller the better, and different muscles are adapted to different amplitudes. The use of corresponding amplitudes for different muscles can improve the massage effect and efficiency. For example, when the gastrocnemius muscle is in a fatigued state, the efficiency of relieving muscle fatigue using a fascia gun with an amplitude of 10mm is better than that of 7mm and 16mm, and the massage efficiency of a fascia gun with an amplitude of 10mm is 25% higher than that of a fascia gun with an amplitude of 7mm, while a fascia gun with an amplitude of 16mm is not suitable for the gastrocnemius muscle and even has a risk of injury. Therefore, in order to improve the massage effect, it is necessary to select a suitable amplitude for different massage parts. In view of this, there are currently many fascia guns with adjustable amplitudes on the market. For example, the patent document with the publication number CN117860552A discloses a fascia massage gun with an adjustable stroke, but its disadvantage is that part of the adjustment mechanism needs to pass through the motor, the structure is relatively complex, and the assembly and maintenance are relatively troublesome, and the production cost is relatively high. Utility Model Content

[0004] In order to overcome the above-mentioned deficiencies of the existing amplitude adjustment mechanism of the fascia gun, the technical problem to be solved by the utility model is: to provide an amplitude adjustment mechanism for a variable amplitude fascia gun which has a simple structure and is easy to assemble and maintain.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The amplitude adjustment mechanism for a variable amplitude fascia gun comprises an eccentric wheel fixedly connected to the rotating shaft of a motor and a swing arm with one end hinged to a piston rod, wherein the other end of the swing arm is connected to the eccentric wheel through an eccentric distance adjustment mechanism, and the eccentric distance adjustment mechanism comprises an actuator and an input mechanism, wherein the input mechanism is located on the side of the eccentric wheel away from the motor, and the actuator is connected between the input mechanism and the eccentric wheel; the actuator comprises a driving block and a sliding block, wherein the sliding block is slidingly arranged on the eccentric wheel through a limiting guide structure, and one end of the swing arm close to the eccentric wheel is rotatably connected to the sliding block, and the driving block is connected to the sliding block through a sliding matching structure and drives the sliding block to slide, so that the distance from the rotating axis of the sliding block and the swing arm to the rotating axis of the motor changes; the input mechanism drives the driving block to move, but does not limit the driving block from rotating with the eccentric wheel.

[0007] The limiting guide structure has both limiting and guiding functions, and is used to limit the sliding block to slide on the eccentric wheel. The sliding direction is limited to the distance between the rotating axis of the sliding block and the swing arm to the rotating axis of the motor, thereby realizing the adjustment of the eccentricity. The sliding matching structure is used to realize the transmission connection between the driving block and the sliding block, and the position of the sliding block on the eccentric wheel is changed by moving the driving block. Since the driving block and the sliding block will rotate with the eccentric wheel, in order to prevent the input mechanism from rotating therewith, the input mechanism is set to drive the driving block to move, but does not limit the driving block from rotating with the eccentric wheel.

[0008] When determining the limiting guide structure between the sliding block and the eccentric wheel, the preferred solution is that the sliding axis defined by the limiting guide structure is perpendicular to the axis of the eccentric wheel and is located in the same plane as the center of the eccentric wheel itself and its rotation center, so that when adjusting the eccentricity, the swing arm can slide in the same plane and the adjustment range of the eccentricity can be maximized. As for the specific structural form of the limiting guide structure, a sliding matching structure of a dovetail groove and a dovetail guide rail, a sliding matching structure of a T-shaped groove and a T-shaped guide rail, or a sliding matching structure of a through hole and a guide rod passing through the through hole can be adopted. The two matching parts in each group of the above sliding matching structures can be respectively arranged on any one of the sliding block and the eccentric wheel.

[0009] For the sliding matching structure between the driving block and the sliding block, the utility model provides the following four solutions:

[0010] Embodiment 1: The sliding matching structure includes a strip groove provided on the sliding block, the length direction of the strip groove is consistent with the sliding direction of the sliding block, the end of the driving block away from the input mechanism slides and penetrates into the strip groove along the axis direction of the motor under the action of the input mechanism, and an inclined guide portion is provided at the end, the axis of the guide portion in the length direction is obliquely intersected with the axis of the strip groove in the length direction, and a guide member slidably connected to the guide portion is provided on the sliding block. The guide portion can be a guide groove, a dovetail guide bar or a T-shaped guide bar provided on the driving block, and the guide member is a guide shaft, a dovetail groove or a T-shaped groove provided in the strip groove and matched with the guide portion.

[0011] Embodiment 2: The sliding matching structure includes a first guide hole obliquely arranged on the sliding block, and a first guide column obliquely arranged on the driving block and slidably connected to the first guide hole. The axis of the first guide hole is obliquely intersected with the sliding axis of the sliding block. The driving block moves along the motor axis under the action of the input mechanism.

[0012] Embodiment three: The sliding matching structure includes a guide block arranged between the sliding block and the driving block, the lower end of the guide block is fixedly connected to the sliding block through a connecting shaft, and the connecting shaft is hinged to the swing arm, and an inclined second guide column is provided at the upper end of the guide block, and the axis of the second guide column is obliquely intersected with the sliding axis of the sliding block, and a second guide hole slidingly connected to the second guide column is provided on the driving block, and the driving block moves along the motor axis direction under the action of the input mechanism.

[0013] Embodiment 4: The sliding fitting structure includes an inclined surface arranged on one side of the sliding direction of the sliding block, and the axis of the extending direction of the inclined surface is obliquely intersected with the sliding axis of the sliding block. The driving block is slidingly connected to the inclined surface of the sliding block through a sliding fitting structure of a dovetail groove and a dovetail guide rail, a sliding fitting structure of a T-slot and a T-guide rail, or a sliding fitting structure of a through hole and a guide rod passing through the through hole. The driving block moves along the axis direction of the motor under the action of the input mechanism.

[0014] The above four embodiments all utilize the bevel transmission principle. With the cooperation of the bevel, the movement of the drive block along the motor axis is converted into the movement of the sliding block along the radial direction of the eccentric wheel, thereby realizing the adjustment of the eccentricity. The reason why the position of the sliding block on the eccentric wheel is adjusted by moving the drive block along the motor axis is that during the operation of the fascia gun, the drive block will rotate with the sliding block and the eccentric wheel, resulting in the positions of the drive block and the sliding block in the radial direction of the eccentric wheel constantly changing, and the input mechanism is not easy to directly transfer the radial force to the drive block. However, the force can be well transferred to the drive block along the motor axis. In addition, when determining the angle of the bevel, the self-locking function of the bevel must be considered. Only the drive block can drive the sliding block to move, and vice versa, the sliding block cannot drive the drive block to move, so as to avoid the reaction force of the swing arm causing the sliding block to move during the massage process.

[0015] For the input mechanism, the utility model provides the following three solutions:

[0016] Embodiment A: The input mechanism comprises an external thread knob, an internal thread knob and a top cover knob, the end of the driving block away from the sliding block is rotatably connected to the external thread knob, and the rotating shaft is coaxial with the rotating shaft of the motor, the side surface of the external thread knob is provided with a limiting portion slidably connected to the limiting plate in the fascia gun housing for limiting the rotation of the external thread knob, the sliding direction of the limiting portion and the limiting plate is consistent with the direction of the motor axis, the internal thread knob is sleeved on the outside of the external thread knob and threadedly connected thereto, the end of the internal thread knob away from the driving block is fixedly connected to the center of the top cover knob, and the top cover knob is rotatably arranged on the fascia gun housing.

[0017] Embodiment B: The input mechanism includes a thumbwheel and a threaded wheel with an external thread. A plurality of through holes are provided around the threaded wheel along its axial direction. The threaded wheel is threadedly connected to an external bracket with an internal thread. The thumbwheel is rotatably arranged at the end of the external bracket and is slidably connected to the through holes on the threaded wheel through a plurality of connecting columns. The end of the drive block away from the sliding block is rotatably connected to the threaded wheel, and the rotating shaft is coaxial with the rotating shaft of the motor.

[0018] Embodiment C: The input mechanism comprises a knob cover, a knob and a sliding bracket, wherein the knob cover is rotatably arranged on the fascia gun housing, the knob is installed at the inner center of the knob cover, the knob is connected to the sliding bracket by a thread, the sliding block is rotatably arranged on the sliding bracket, and the rotating shaft is coaxial with the rotating shaft of the motor, and the sliding bracket is provided with a plurality of guide columns which are parallel to the rotating shaft of the motor and are slidably connected to the guide holes on the motor bracket.

[0019] The above three embodiments all adopt the screw nut transmission principle, and the rotational motion of the top cover knob, the dial wheel and the knob cover is converted into the linear motion of the outer thread knob, the thread wheel and the sliding bracket respectively through the threaded matching, thereby driving the drive block to move along the axis direction of the motor. The threaded connection can also realize the fine adjustment of the moving distance of the drive block, thereby realizing the stepless adjustment of the amplitude of the fascia gun.

[0020] The beneficial effects of the utility model are as follows: by arranging the motor and the eccentricity adjustment mechanism on both sides of the eccentric wheel respectively, the two can be assembled independently without affecting each other, and the assembly, inspection and maintenance are relatively convenient, and no motor modification is involved, and the cost is low; the eccentricity adjustment mechanism is divided into an input mechanism and an actuator, wherein the actuator converts the movement of the driving block along the motor axis into the radial movement of the sliding block along the eccentric wheel through the cooperation of the driving block and the sliding block, thereby driving the swing arm to approach or move away from the rotation center of the eccentric wheel to achieve eccentricity adjustment, and then change the amplitude of the fascia gun; the input mechanism converts the rotational motion of the knob into the linear motion of the driving block by utilizing the screw nut transmission principle, the amplitude adjustment is convenient, and the amplitude can be infinitely adjusted, thereby meeting different massage needs and improving the massage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model when the eccentricity is minimum;

[0022] Figure 2 This is a schematic diagram of the structure of the first embodiment of the utility model when the eccentricity is maximum;

[0023] Figure 3 This is a schematic diagram of the connection structure between the slider and the eccentric wheel in the first embodiment of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the second embodiment of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the third embodiment of the utility model;

[0026] Figure 6 This is a structural front view of the fourth embodiment of the utility model;

[0027] Figure 7 This is a structural side view of the fourth embodiment of the utility model;

[0028] Figure 8 It is a top view of the structure of the fourth embodiment of the present utility model.

[0029] The markings in the figure are: 1-motor, 2-actuator, 3-input mechanism, 4-eccentric wheel, 5-piston rod, 6-swing arm, 7-fascia gun housing, 8-external bracket, 9-motor bracket, 11-rotating shaft, 21-driving block, 22-sliding block, 23-guide block, 31-external tooth knob, 32-internal tooth knob, 33-top cover knob, 34-push wheel, 35-threaded wheel, 36-knob cover, 37-knob, 38- Sliding bracket, 41-dovetail guide rail, 71-limiting plate, 91-guide hole, 211-guide part, 212-first guide column, 213-second guide hole, 221-dovetail groove, 222-strip groove, 223-guide member, 224-first guide hole, 225-inclined surface, 231-second guide column, 232-connecting shaft, 311-limiting part, 341-connecting column, 351-through hole, 381-guide column. DETAILED DESCRIPTION

[0030] The utility model is further described below in conjunction with the accompanying drawings.

[0031] It should be noted that if there are directional indication terms in the present invention, such as up, down, left, right, front, and back directions and orientation terms, they are for the purpose of facilitating the description of the relative position relationship between components, and are not for the absolute position of the related components or the position relationship between components. They are only used to explain the relative position relationship and movement of the components in a certain posture. If the specific posture changes, the directional indication will also change accordingly. If there are terms related to quantity in the present invention, such as "multiple", "multiple", "several", etc., they specifically refer to two or more.

[0032] like Figure 1-6 As shown, the amplitude adjustment mechanism for a variable amplitude fascia gun provided by the utility model comprises an eccentric wheel 4 fixedly connected to the rotating shaft 11 of the motor 1 and a swing arm 6 hinged to the piston rod 5 at one end, the other end of the swing arm 6 is connected to the eccentric wheel 4 through an eccentric distance adjustment mechanism, the eccentric distance adjustment mechanism comprises an actuator 2 and an input mechanism 3, wherein the input mechanism 3 is located on the side of the eccentric wheel 4 away from the motor 1, and the actuator 2 is connected between the input mechanism 3 and the eccentric wheel 4; the actuator 2 comprises a driving block 21 and a sliding block 22, the sliding block 22 is slidingly arranged on the eccentric wheel 4 through a limiting guide structure, one end of the swing arm 6 close to the eccentric wheel 4 is rotatably connected to the sliding block 22, the driving block 21 is connected to the sliding block 22 through a sliding matching structure and drives the sliding block 22 to slide, so that the distance from the rotating axis of the sliding block 22 and the swing arm 6 to the rotating shaft 11 of the motor 1 changes; the input mechanism 3 drives the driving block 21 to move, but does not limit the driving block 21 from rotating with the eccentric wheel 4.

[0033] The working principle of the fascia gun is to use a crank slider mechanism composed of an eccentric wheel 4, a swing arm 6 and a piston rod 5 to convert the rotation of the motor 1 into the reciprocating motion of the piston rod 5. The eccentricity refers to the distance from the hinge axis of the swing arm 6 and the eccentric wheel 4 to the axis of rotation of the eccentric wheel 4. By adjusting the eccentricity, the reciprocating stroke of the piston rod 5 can be changed, thereby realizing the amplitude adjustment of the fascia gun. The principle of adjusting the eccentricity adopted by the utility model is that a slidable sliding block 22 is provided on the eccentric wheel 4, the swing arm 6 is hinged to the sliding block 22, and the sliding block 22 is restricted to slide on the eccentric wheel 4 under the action of the limiting guide structure, thereby driving the hinge end of the swing arm 6 and the sliding block 22 to approach or move away from the rotation center of the eccentric wheel 4, thereby realizing the adjustment of the eccentricity. The movement of the sliding block 22 is realized by the input mechanism 3 and the driving block 21. The driving block 21 and the sliding block 22 are connected by a sliding matching structure. The input mechanism 3 makes the driving block 21 move in a certain direction. The sliding matching structure transmits the force and displacement generated by the movement of the driving block 21 to the sliding block 22, so that the sliding block 22 moves relative to the eccentric wheel 4 under the action of the limiting guide structure. Since the driving block 21 and the sliding block 22 need to be contacted for transmission, the driving block 21 will rotate with the eccentric wheel 4. Therefore, it is necessary to ensure that the input mechanism 3 does not limit the rotation of the driving block 21 with the eccentric wheel 4.

[0034] The position limiting and guiding structure refers to a structure having both position limiting and guiding functions. In the present utility model, position limiting refers to limiting the sliding block 22 from being separated from the eccentric wheel 4, and guiding refers to enabling the sliding block 22 to slide on the eccentric wheel 4 along its guiding direction. The present utility model provides three specific position limiting and guiding structures, including: Figure 3 The dovetail groove 221 and the dovetail guide rail 41 are shown in the sliding matching structure. Figure 7 The sliding matching structure of the T-slot and the T-shaped guide rail or the sliding matching structure of the through hole and the guide rod passing through the through hole shown in the figure certainly does not exclude other structures with similar functions. The above three structures can realize the limiting and sliding guiding functions of the sliding block 22 and the eccentric wheel 4. Specifically, when setting, the two parts in each matching structure can be respectively set on any one of the sliding block 22 and the eccentric wheel 4, for example, the dovetail groove 221 can be set on the eccentric wheel 4, and the corresponding dovetail guide rail 41 is set on the sliding block 22, or vice versa, the dovetail groove 221 is set on the sliding block 22, and the dovetail guide rail 41 is set on the eccentric wheel 4.

[0035] Considering the stability of the fascia gun, the swing arm 6 usually swings in one plane. Therefore, in order to simplify the structure, the swing arm 6 should not move along the axial direction of the hinge shaft at both ends during the adjustment of the eccentricity. Therefore, the preferred solution of the limit guide structure is that the sliding axis defined by it is perpendicular to the axis of the eccentric wheel 4, that is, Figure 3The axis of the dovetail guide rail 41 is perpendicular to the axis of the eccentric wheel 4, so that during the process of adjusting the eccentricity, the swing arm 6 moves only in the same plane, which can improve the stability of the eccentricity adjustment. In addition, in order to make the movement of the sliding block 22 change the eccentricity intuitively, the sliding axis defined by the limit guide structure, i.e. Figure 3 The axis of the dovetail guide rail 41 shown should be located in the same plane as the center of the eccentric wheel 4 itself and its rotation center, so that efficient adjustment of the eccentricity can be achieved and the adjustment range of the eccentricity can be maximized.

[0036] The sliding matching structure between the driving block 21 and the sliding block 22 mainly utilizes the inclined plane transmission principle to convert the movement of the driving block 21 in one direction into the movement of the sliding block 22 in another direction through the inclined plane contact. To achieve this function, the utility model provides the following four embodiments:

[0037] Embodiment 1: Figure 1-3 As shown, the sliding matching structure includes a strip groove 222 arranged on the sliding block 22, the length direction of the strip groove 222 is consistent with the sliding direction of the sliding block 22, and the end of the driving block 21 away from the input mechanism 3 slides and penetrates in the strip groove 222 along the axis direction of the motor 1 under the action of the input mechanism 3, and an inclined guide part 211 is provided at this end, and the axis of the length direction of the guide part 211 is obliquely intersected with the axis of the length direction of the strip groove 222, and the sliding block 22 is provided with a guide member 223 slidably connected to the guide part 211. Oblique intersection means that two lines are located in the same plane and intersect, and the angle of intersection is not 0° and 90°. The working process of this scheme is that when the driving block 21 is moved along the axis direction of the motor 1, because the guide part 211 and the length direction of the strip groove 222 form a certain angle, and the guide member 223 cannot move along the axis direction of the motor 1, it can only move along the length direction of the strip groove 222 under the guidance of the guide part 211, thereby driving the sliding block 22 to move along the length direction of the strip groove 222 to achieve the adjustment of the eccentricity. Figure 1 , Figure 2 As shown, they are schematic diagrams of the positional relationship between the driving block 21 and the sliding block 22 when the eccentricity is minimum and maximum, respectively. When setting the inclination angle of the guide portion 211, the self-locking function of the inclined surface can be considered, that is, the guide portion 211 can drive the guide member 223 to move, and vice versa, the guide member 223 cannot drive the guide portion 211 to move, so as to avoid the reaction force during the fascia gun massage process causing the sliding block 22 and the driving block 21 to move.

[0038] For the sliding connection between the guide portion 211 and the guide member 223, the present invention also provides a variety of solutions, such as Figure 1As shown, the guide portion 211 is a guide groove provided on the driving block 21, and the guide member 223 is a guide shaft provided in the strip groove 222 and matching the guide groove. Alternatively, the guide portion 211 may be a dovetail guide bar, and the guide member 223 may be a dovetail groove provided in the strip groove 222 and matching the guide portion 211. Alternatively, the guide portion 211 may be a T-shaped guide bar, and the guide member 223 may be a T-shaped groove provided in the strip groove 222 and matching the guide portion 211.

[0039] Embodiment 2: Figure 4 As shown, the sliding matching structure includes a first guide hole 224 obliquely arranged on the sliding block 22, and a first guide column 212 obliquely arranged on the driving block 21 and slidably connected to the first guide hole 224. The axis of the first guide hole 224 is obliquely intersected with the sliding axis of the sliding block 22. The driving block 21 moves along the axis direction of the motor 1 under the action of the input mechanism 3. Its working process is that when the driving block 21 is moved along the axis direction of the motor 1, because the first guide hole 224 and the sliding axis of the sliding block 22 form a certain angle, and the sliding block 22 cannot move along the axis direction of the motor 1, it can only move along the direction limited by the limiting guide structure under the guiding action of the first guide column 212 to achieve the adjustment of the eccentricity. Compared with the first embodiment, this scheme directly uses the cooperation of the inclined first guide hole 224 and the first guide column 212 to realize the movement of the sliding block 22, and the overall structure is simpler.

[0040] Embodiment 3: Figure 5 As shown, the sliding matching structure includes a guide block 23 arranged between the sliding block 22 and the driving block 21, the lower end of the guide block 23 is fixedly connected to the sliding block 22 through a connecting shaft 232, and is hinged to the swing arm 6 at the same time, and the upper end of the guide block 23 is provided with an inclined second guide column 231, the axis of the second guide column 231 is obliquely intersected with the sliding axis of the sliding block 22, and the driving block 21 is provided with a second guide hole 213 that is slidably connected to the second guide column 231, and the driving block 21 moves along the axis direction of the motor 1 under the action of the input mechanism 3. The working principle of this scheme is the same as that of the second embodiment, except that the setting positions of the guide hole and the guide column are different. In addition, since the driving block 21 in both the first and second embodiments must pass through the sliding block 22, in order to avoid interference, the swing arm 6 needs to be sleeved outside the entire sliding block 22, a larger bearing will be used, and the size of the swing arm 6 will also be increased. In this embodiment, the guide block 23 is connected to the sliding block 22 via a smaller connecting shaft 232, and then the swing arm 6 is rotatably connected to the connecting shaft 232, so that the bearing and the swing arm 6 can be set smaller, thereby saving costs.

[0041] Embodiment 4: Figure 6-8As shown, the sliding fit structure includes an inclined surface 225 provided on one side of the sliding block 22 facing its sliding direction, and the axis of the extending direction of the inclined surface 225 is obliquely intersected with the sliding axis of the sliding block 22. The driving block 21 is slidingly connected to the inclined surface 225 of the sliding block 22 through the sliding fit structure of the dovetail groove and the dovetail guide rail, the sliding fit structure of the T-slot and the T-guide rail, or the sliding fit structure of the through hole and the guide rod passing through the through hole. The driving block 21 moves along the axis direction of the motor 1 under the action of the input mechanism 3. The connection method between the driving block 21 and the inclined surface 225 is the same as the connection method between the sliding block 22 and the eccentric wheel 4, that is, the two can slide relative to each other, but cannot be separated from each other, so that the driving block 21 can drive the sliding block 22 to move by utilizing the action of the inclined surface. As shown Figure 6 As shown, when the driving block 21 moves upward, the sliding block 22 moves rightward, and when the driving block 21 moves downward, the sliding block 22 moves leftward.

[0042] For the input mechanism 3, the utility model provides the following three embodiments:

[0043] Example A: Figure 1-3 As shown, the input mechanism 3 includes an outer thread knob 31, an inner thread knob 32 and a top cover knob 33. The end of the driving block 21 away from the sliding block 22 is rotatably connected to the outer thread knob 31, and the rotating shaft is coaxial with the rotating shaft 11 of the motor 1. The side of the outer thread knob 31 is provided with a limiting portion 311 slidably connected to the limiting plate 71 in the fascia gun housing 7 for limiting the rotation of the outer thread knob 31. The sliding direction of the limiting portion 311 and the limiting plate 71 is consistent with the axial direction of the motor 1. The inner thread knob 32 is sleeved on the outside of the outer thread knob 31 and is threadedly connected thereto. The end of the inner thread knob 32 away from the driving block 21 is fixedly connected to the center of the top cover knob 33, and the top cover knob 33 is rotatably set on the fascia gun housing 7. The driving block 21 and the external thread knob 31 can be connected by a bearing to improve the stability and smoothness of the relative rotation between the two. The rotation axis is coaxial with the rotation axis 11 of the motor 1, thereby realizing the coaxial rotation of the driving block 21, the eccentric wheel 4 and the sliding block 22. Figure 2As shown, the limiting portion 311 on the outer thread knob 31 can be in plane contact with the limiting plate 71, thereby limiting the rotation of the outer thread knob 31. The inner thread knob 32 and the top cover knob 33 can be connected by screws, or a cross bone plug assembly can be added to increase stability, ensuring that the top cover knob 33 can stably drive the inner thread knob 32 to rotate. The top cover knob 33 can be rotatably set on the fascia gun housing 7 through the matching structure of the clamping ring and the buckle, and there is an anti-slip structure between the two to provide a force for the axial movement of the outer thread knob 31. The working process of the input mechanism 3 is that when the top cover knob 33 is rotated, the inner thread knob 32 rotates synchronously. Since the outer thread knob 31 cannot rotate, the outer thread knob 31 will move in the axial direction relative to the inner thread knob 32 under the action of the threaded connection, thereby driving the driving block 21 to move along the axis of the motor 1. Under the action of the above-mentioned sliding matching structure, the driving block 21 drives the sliding block 22 to move in the direction specified by its limiting guide structure, thereby realizing eccentricity adjustment.

[0044] Example B: Figure 4 , Figure 5 As shown, the input mechanism 3 includes a thumbwheel 34 and a threaded wheel 35 with external threads. The threaded wheel 35 is provided with a plurality of through holes 351 along its axial direction. The threaded wheel 35 is threadedly connected to an external bracket 8 with internal threads. The thumbwheel 34 is rotatably arranged at the end of the external bracket 8 and is slidably connected to the through holes 351 on the threaded wheel 35 through a plurality of connecting columns 341. The end of the drive block 21 away from the sliding block 22 is rotatably connected to the threaded wheel 35, and the rotating shaft is coaxial with the rotating shaft 11 of the motor 1. Similarly, the drive block 21 and the threaded wheel 35 are preferably connected by a bearing, and the rotating shafts of the two are coaxial with the rotating shaft 11 of the motor 1, so as to realize the coaxial rotation of the drive block 21, the eccentric wheel 4 and the sliding block 22. The thumbwheel 34 also needs to be limited to rotate at the end of the external bracket 8 and cannot be separated from the external bracket 8. The external bracket 8 can adopt the shell structure of the fascia gun or the bracket of the motor 1. The working process of the input mechanism 3 is that when the dial wheel 34 is rotated, the connecting column 341 drives the threaded wheel 35 to rotate. Under the action of the threaded connection, since the external bracket 8 is fixed, the threaded wheel 35 will move along the axis of the external bracket 8. At the same time, the threaded wheel 35 also slides along the connecting column 341 under the action of the through hole 351, thereby driving the driving block 21 to move along the axis of the motor 1. Under the action of the above-mentioned sliding matching structure, the driving block 21 drives the sliding block 22 to move along the direction specified by its limiting guide structure, thereby realizing eccentricity adjustment.

[0045] Example C: Figure 6-8As shown, the input mechanism 3 includes a knob cover 36, a knob 37 and a sliding bracket 38. The knob cover 36 is rotatably arranged on the fascia gun housing 7, and the knob 37 is installed at the inner center of the knob cover 36. The knob 37 is connected to the sliding bracket 38 by threads. The sliding block 22 is rotatably arranged on the sliding bracket 38, and the rotating shaft is coaxial with the rotating shaft 11 of the motor 1. The sliding bracket 38 is provided with a plurality of guide posts 381 parallel to the rotating shaft 11 of the motor 1 and slidably connected to the guide holes 91 on the motor bracket 9. This scheme is mainly applicable to the sliding matching structure in the above-mentioned embodiment 4. Since the inclined surface 225 is provided on the side of the sliding block 22, the height of the sliding block 22 is relatively high. In order to avoid interference, the swing arm 6 is preferably connected to the top of the sliding block 22, so it is necessary to set a sliding bracket 38 to bypass the swing arm 6 and connect to the sliding block 22. An opening for the swing arm 6 to pass through and swing needs to be reserved on the sliding bracket 38. The lower end of the sliding bracket 38 is slidably connected to the guide hole 91 on the motor bracket 9 through the guide column 381, which can limit the rotation of the sliding bracket 38. The working process of the input mechanism 3 is that when the knob cover 36 is rotated, the knob 37 rotates accordingly. Under the action of the threaded connection, the sliding bracket 38 cannot rotate under the restriction of the guide column 381 and the guide hole 91, and can only slide along the guide hole 91, thereby driving the driving block 21 to move along the axis of the motor 1. Under the action of the above-mentioned sliding matching structure, the driving block 21 drives the sliding block 22 to move along the direction defined by its limit guide structure, thereby realizing the eccentricity adjustment.

Claims

1. An amplitude adjustment mechanism for a variable amplitude fascia gun, comprising an eccentric wheel (4) fixedly connected to a rotating shaft (11) of a motor (1) and a swing arm (6) hinged to a piston rod (5) at one end, wherein the other end of the swing arm (6) is connected to the eccentric wheel (4) via an eccentricity adjustment mechanism, and is characterized in that: The eccentricity adjustment mechanism comprises an actuator (2) and an input mechanism (3), wherein the input mechanism (3) is located on a side of the eccentric wheel (4) away from the motor (1), and the actuator (2) is connected between the input mechanism (3) and the eccentric wheel (4); the actuator (2) comprises a driving block (21) and a sliding block (22), wherein the sliding block (22) is slidably arranged on the eccentric wheel (4) through a limiting guide structure, and one end of the swing arm (6) close to the eccentric wheel (4) is rotatably connected to the sliding block (22); the driving block (21) is connected to the sliding block (22) through a sliding matching structure and drives the sliding block (22) to slide, so that the distance between the rotating axis of the sliding block (22) and the swing arm (6) and the rotating axis (11) of the motor (1) changes; the input mechanism (3) drives the driving block (21) to move, but does not limit the driving block (21) from rotating with the eccentric wheel (4).

2. The amplitude adjustment mechanism for a variable amplitude fascia gun according to claim 1, characterized in that: The sliding axis defined by the position-limiting guide structure is perpendicular to the axis of the eccentric wheel (4) and is located in the same plane as the center of the eccentric wheel (4) itself and its rotation center; the position-limiting guide structure is a sliding matching structure between a dovetail groove (221) and a dovetail guide rail (41), a sliding matching structure between a T-shaped groove and a T-shaped guide rail, or a sliding matching structure between a through hole and a guide rod passing through the through hole.

3. The amplitude adjustment mechanism for a variable amplitude fascia gun according to claim 1, characterized in that: The sliding matching structure comprises a strip groove (222) arranged on the sliding block (22), the length direction of the strip groove (222) is consistent with the sliding direction of the sliding block (22), and the end of the driving block (21) away from the input mechanism (3) slides and penetrates into the strip groove (222) along the axis direction of the motor (1) under the action of the input mechanism (3), and an inclined guide part (211) is provided at this end, the axis of the guide part (211) in the length direction is obliquely intersected with the axis of the strip groove (222) in the length direction, and the sliding block (22) is provided with a guide member (223) slidably connected to the guide part (211).

4. The amplitude adjustment mechanism for a variable amplitude fascia gun according to claim 3, characterized in that: The guide portion (211) is a guide groove, a dovetail guide bar or a T-shaped guide bar arranged on the driving block (21), and the guide member (223) is a guide shaft, a dovetail groove or a T-shaped groove arranged in the strip groove (222) and matching the guide portion (211).

5. The amplitude adjustment mechanism for a variable amplitude fascia gun according to claim 1, characterized in that: The sliding matching structure comprises a first guide hole (224) obliquely arranged on the sliding block (22), and a first guide column (212) obliquely arranged on the driving block (21) and slidably connected to the first guide hole (224), wherein the axis of the first guide hole (224) is obliquely intersected with the sliding axis of the sliding block (22), and the driving block (21) moves along the axis direction of the motor (1) under the action of the input mechanism (3).

6. The amplitude adjustment mechanism for a variable amplitude fascia gun according to claim 1, characterized in that: The sliding matching structure comprises a guide block (23) arranged between the sliding block (22) and the driving block (21); the lower end of the guide block (23) is fixedly connected to the sliding block (22) via a connecting shaft (232), and the connecting shaft (232) is hinged to the swing arm (6); the upper end of the guide block (23) is provided with an inclined second guide column (231), the axis of the second guide column (231) is obliquely intersected with the sliding axis of the sliding block (22); the driving block (21) is provided with a second guide hole (213) slidably connected to the second guide column (231); and the driving block (21) moves along the axis direction of the motor (1) under the action of the input mechanism (3).

7. The amplitude adjustment mechanism for a variable amplitude fascia gun according to claim 1, characterized in that: The sliding matching structure comprises an inclined surface (225) arranged on one side of the sliding block (22) facing its sliding direction, the axis of the extending direction of the inclined surface (225) is obliquely intersected with the sliding axis of the sliding block (22), the driving block (21) is slidingly connected to the inclined surface (225) of the sliding block (22) through a sliding matching structure of a dovetail groove and a dovetail guide rail, a sliding matching structure of a T-shaped groove and a T-shaped guide rail, or a sliding matching structure of a through hole and a guide rod passing through the through hole, and the driving block (21) moves along the axis direction of the motor (1) under the action of the input mechanism (3).

8. The amplitude adjustment mechanism for a variable amplitude fascia gun according to any one of claims 1 to 7, characterized in that: The input mechanism (3) includes an outer thread knob (31), an inner thread knob (32) and a top cover knob (33); one end of the driving block (21) away from the sliding block (22) is rotatably connected to the outer thread knob (31), and the rotating shaft is coaxial with the rotating shaft (11) of the motor (1); a side surface of the outer thread knob (31) is provided with a limiting portion (311) slidably connected to a limiting plate (71) in a fascia gun housing (7) for limiting the rotation of the outer thread knob (31); the sliding direction of the limiting portion (311) and the limiting plate (71) is consistent with the axial direction of the motor (1); the inner thread knob (32) is sleeved outside the outer thread knob (31) and is threadedly connected thereto; the end of the inner thread knob (32) away from the driving block (21) is fixedly connected to the center of the top cover knob (33); and the top cover knob (33) is rotatably arranged on the fascia gun housing (7).

9. The amplitude adjustment mechanism for a variable amplitude fascia gun according to any one of claims 1 to 7, characterized in that: The input mechanism (3) comprises a thumbwheel (34) and a threaded wheel (35) with external threads, a plurality of through holes (351) are arranged around the threaded wheel (35) along its axial direction, the threaded wheel (35) is threadedly connected to an external bracket (8) with internal threads, the thumbwheel (34) is rotatably arranged at the end of the external bracket (8) and is slidably connected to the through holes (351) on the threaded wheel (35) through a plurality of connecting columns (341), the end of the driving block (21) away from the sliding block (22) is rotatably connected to the threaded wheel (35), and the rotating shaft is coaxial with the rotating shaft (11) of the motor (1).

10. The amplitude adjustment mechanism for a variable amplitude fascia gun according to any one of claims 1 to 7, characterized in that: The input mechanism (3) includes a knob cover (36), a knob (37) and a sliding bracket (38), wherein the knob cover (36) is rotatably mounted on the fascia gun housing (7), the knob (37) is mounted on the inner center of the knob cover (36), the knob (37) is threadedly connected to the sliding bracket (38), the sliding block (22) is rotatably mounted on the sliding bracket (38), and the rotating shaft is coaxial with the rotating shaft (11) of the motor (1), and the sliding bracket (38) is provided with a plurality of guide columns (381) parallel to the rotating shaft (11) of the motor (1) and slidably connected to the guide holes (91) on the motor bracket (9).

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