Double-head fascia gun

Abstract

The utility model relates to a double-end fascia gun which comprises a main body, a power motor and a fascia impact assembly, the power motor is a double-end motor, and output shafts are arranged at the two ends of the power motor; the two fascia impact assemblies are symmetrically arranged at the two ends of the motor, each fascia impact assembly comprises a fascia head piece, a connecting rod and an eccentric piece, the eccentric piece is provided with an eccentric shaft, the fascia head pieces are driven by the connecting rods to do linear reciprocating motion to achieve linear impact, the movement directions of the two fascia head pieces are parallel, and an action gap is formed. The rotating positions of the eccentric shafts of the two eccentric parts are staggered, so that the two fascia head parts stretch out and draw back alternately, and the rubbing effect on the gap part is achieved. Through the double-head motor synchronous driving and differential transmission design, impacting and kneading traction are synchronously achieved, the problem that a traditional fascia gun is single in massage form is solved, and the transmission structure is simple and efficient.

Description

Technical Field

[0001] This utility model relates to the field of fascia massage device technology, and in particular to a double-headed fascia gun. Background Technology

[0002] Fascia guns, as portable deep muscle massage devices, apply impact to muscles and fascia through the high-frequency reciprocating motion of the massage head. This effectively relieves muscle fatigue, loosens fascial adhesions, and promotes local blood circulation, and is widely used in post-exercise recovery and daily muscle relaxation. Existing fascia guns primarily use a single-head high-frequency linear impact mechanism. This mechanism uses a motor-driven eccentric wheel to move a single massage head in a linear reciprocating motion, relying on the high-frequency mechanical impact force at a single point to achieve deep fascial release. However, this type of fascia gun has a limited massage method, only providing a pounding impact and failing to create a kneading or stretching effect on muscles. Its effectiveness in relieving muscle knots and localized muscle tension is limited. To compensate for the functional deficiencies of single-head fascia guns, attempts have been made to achieve a kneading effect by using complex linkage and eccentric wheel combinations to create relative left-right oscillations between two massage heads. However, such structures are cumbersome to design, require high transmission precision, are prone to wear and jamming, and cannot simultaneously achieve both impact and kneading effects. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology by providing a double-headed fascia gun, which overcomes the single massage mode of the existing fascia gun and provides a double-headed fascia gun that can simultaneously achieve impact and kneading and traction with a simple transmission structure.

[0004] The technical solution of this utility model is as follows: A double-headed fascia gun includes a main body, a power motor, and a fascia impact assembly. The power motor is a double-headed motor with output shafts at both ends. The fascia impact assembly has two sets, which are symmetrically arranged at both ends of the double-headed motor.

[0005] Each fascial impact assembly includes a fascial head, a connecting rod, and an eccentric component. The eccentric component is equipped with an eccentric shaft, the central axis of which is eccentrically positioned relative to the central axis of the output shaft of the power motor. One end of the connecting rod is a connecting end, and the other end is equipped with an assembly head that is assembled with the fascial head. The connecting end is rotatably sleeved on the eccentric shaft. The eccentric component is connected to the output shaft of the power motor. The eccentric shaft drives the fascial head to perform linear reciprocating motion via the connecting rod to achieve linear impact.

[0006] The two fascia heads move in parallel directions and form a pre-set gap between them.

[0007] The eccentric shafts of the two eccentric components rotate at different positions, so that the two fascia heads make alternating linear reciprocating motions in the front-back direction to achieve a kneading effect on the internal part of the action gap.

[0008] Using the above technical solution, the dual output shafts of the dual-head motor synchronously drive two sets of symmetrical fascia impact components, causing the two fascia heads to perform synchronous linear reciprocating motions parallel to each other, achieving synchronous linear high-frequency impact. Compared with traditional single-head fascia guns, it can act on two different points of the human muscle. The two fascia heads form an alternating extension and contraction motion effect through the staggered arrangement of two eccentric shafts. When one fascia head extends forward to impact the muscle, the other fascia head retracts backward. In the next rotation cycle, the extended fascia head retracts and the retracted fascia head extends. The two fascia heads can alternately extend and contract to squeeze and relax the muscle sandwiched in the middle, simulating the action of human hand kneading muscles. This replaces the single-head single-pounding mode and can achieve both impact and kneading massage effects simultaneously without the need for additional complex transmission mechanisms. It not only solves the problem of the single massage form of traditional single-head fascia guns, but also avoids the problems of structural complexity, easy wear and jamming caused by adding additional transmission mechanisms. The overall transmission path is short, the power loss is small, and the working stability is better. By utilizing the preset spacing, it creates a wrapping massage to the target muscles. It can also simulate the kneading and pinching techniques in manual massage through the alternating extension and contraction of the two fascia heads, which can cover a larger area of ​​muscle tissue and achieve a deeper relaxation effect.

[0009] A further feature of this invention is that the assembly head can be linearly reciprocated and passed through the corresponding mating port of the main body. An elastic sleeve structure is installed between the outer periphery of the assembly head and the inner wall of the mating port. The assembly head has an assembly hole inside for inserting and assembling the fascia head component.

[0010] With the above-mentioned further design, the mounting head of the connecting rod can be linearly reciprocated through the mating port of the main body. The mating port provides precise axial guidance for the reciprocating motion of the connecting rod, effectively preventing radial offset and wobbling of the connecting rod, ensuring the accuracy of the linear impact, alternating pushing and squeezing, and reverse traction motion trajectory of the fascia head, and ensuring that the massage force is stably applied to the target muscle area without deviation. The elastic sleeve structure between the mounting head and the inner wall of the mating port forms a flexible buffer for the reciprocating motion of the mounting head, which not only reduces the hard contact wear between the mounting head and the mating port and extends the service life of the component, but also effectively buffers the reaction force generated by the fascia head during impact, pushing and pulling, reduces the transmission of vibration to the interior of the main body, reduces the vibration at the grip end, avoids hand numbness, and improves the comfort of gripping and using.

[0011] A further feature of this invention is that the elastic sleeve structure includes a pair of elastic sleeves, with an annular groove with an inner ring opening formed between the opposite ends of the pair of elastic sleeves. A core soaked in lubricating oil is installed in the annular groove, and both the pair of elastic sleeves and the inner ring of the core are in contact with the assembly head.

[0012] With the further configuration described above, the lubricated core is secured within the annular groove between the two elastic sleeves, making core replacement and disassembly very convenient and facilitating future maintenance. The lubricated core maintains continuous lubrication of the assembly head's outer wall, ensuring smooth linear reciprocating motion of the assembly head between the elastic sleeves and the inner ring of the core. This reduces noise and component wear caused by friction, eliminating the need for frequent lubrication replenishment and lowering the frequency of equipment maintenance. It also prevents lubricant leakage that could contaminate the machine or the operating environment.

[0013] A further feature of this invention is as follows: the eccentric component is provided with a shaft connection hole for the insertion of the output shaft of the power motor; the outer wall of the output shaft of the power motor is formed with a plane A; the inner wall of the shaft connection hole of the eccentric component is formed with a plane B; the output shaft and the shaft connection hole are circumferentially limited by the fit between plane A and plane B; the eccentric component is provided with a fixing hole that extends radially to the shaft connection hole; a locking member is inserted into the fixing hole and abuts against the positioning groove on the plane A of the output shaft to lock and fix the eccentric component to the motor output shaft.

[0014] With the aforementioned further design, when assembling the eccentric component, simply align the output shaft with the shaft connection hole and insert it. The fit between plane A and plane B quickly completes the circumferential positioning, preventing slippage and misalignment of the eccentric component as it rotates with the output shaft. This simplifies the assembly process and ensures transmission stability during long-term use. The locking component, after passing through the fixing hole, rests against plane A. On one hand, it uses compressive force to prevent the eccentric component from axially shifting along the output shaft. On the other hand, the planar structure provides a larger contact surface, and the locking mechanism via the positioning groove is more secure, preventing the locking component from loosening after prolonged vibration. This significantly improves the reliability of the connection between the eccentric component and the output shaft. The dual fixing structure of planar limiting and radial locking makes the connection between the eccentric component and the output shaft more stable, ensuring the motion stability of the fascia impact assembly.

[0015] A further feature of this invention is as follows: the main body includes a gripping part, a working part, and a long rod part with a curved structure connecting the gripping part and the working part; the power motor and the fascia impact assembly are both arranged inside the working part, and the two fascia head pieces are arranged along the length direction of the working part; the gripping part has a built-in power supply and a circuit board located on one side of the power supply, and the gripping part is provided with control buttons, and the control buttons, the power motor, and the power supply are all electrically connected to the circuit board.

[0016] With the aforementioned further design, the curved long rod connects the grip and the working part, conforming to ergonomic design. This allows the user's wrist to remain in a natural, relaxed posture during use, preventing wrist soreness from prolonged twisting and exertion during extended massage, thus improving comfort over long periods. The motor and fascia impact components are located in the working part, while the power supply and circuit board are located in the grip, resulting in a more balanced weight distribution. This prevents wrist fatigue due to excessive weight in the working part or instability in the grip due to excessive weight in the grip, optimizing the overall handling feel. Simultaneously, the control buttons are located on the grip, allowing users to directly adjust the speed or turn the device on and off using their fingers without changing their grip posture, making it more convenient and user-friendly. The electrical wiring is routed along the inside of the long rod, integrating and streamlining the power and control circuits, avoiding messy tangles within the main body, and reducing the risk of short circuits due to long-term vibration and friction, thus improving the safety and lifespan of the entire device.

[0017] A further feature of this invention is as follows: the main body comprises a first shell and a second shell, which are separately configured. The first shell and the second shell are joined together to form an installation cavity. A power motor, a fascia impact component, a power supply, and a circuit board are disposed in corresponding positions within the installation cavity. The power supply is installed in a power supply compartment formed by the joining of the first shell and the second shell. The circuit board is installed in a circuit board slot formed by the joining of the first shell and the second shell. The two ends of the power motor are respectively supported and positioned in the compartment support plate of the first shell and covered by the compartment cover plate.

[0018] With the above-mentioned further design, the main body adopts a split first shell and second shell mating structure. After mating, it forms an installation cavity and independent power supply compartment, circuit board slot, etc., realizing the independent installation of each core component. This not only avoids mutual interference and vibration transmission between components, but also improves the stability of each component installation and reduces the probability of failure due to mutual collision and interference. The power motor is supported at both ends by the compartment support plate and covered by the compartment cover plate, which positions the motor, limits the displacement and shaking of the motor when it runs at high speed, ensures the stability of the motor operation, and reduces the noise generated by motor vibration and body resonance. The split shell structure greatly reduces the overall processing difficulty of the main body, eliminating the need to process a complex one-piece internal cavity structure.

[0019] A further feature of this invention is as follows: the first housing and the second housing are connected by inserting a post and inserting a hole and fastened by screws; the first housing and the second housing are joined to form an assembly joint, the assembly joint having an internal fitting port for the connecting rod to pass through, an end cap being fitted on the front end of the assembly joint, the end cap having an opening at the corresponding fitting port position, and the elastic sleeve structure being limited between the end cap and the rear retaining ring of the inner wall of the main body.

[0020] With the above-mentioned further configuration, the first and second housings are pre-positioned through the insertion of pins and holes, and then fastened together with screws. The insertion pre-positioning ensures the accuracy of the two housings' alignment, avoiding misalignment that could affect the installation and positioning of internal components. The screw fastening further enhances the overall stability of the housing connection, strengthens the rigidity of the main structure, effectively resists vibrations caused by motor operation and the impact of the fascia head, and reduces the shaking and deformation of the machine body. The two housings are joined together to form an assembly joint, the interior of which is integrally formed with a mating port for the connecting rod to pass through. An end cap is installed on the outside of the assembly joint. The end cap can effectively limit and protect the elastic sleeve structure and other components inside the mating port, and can also achieve a stable fixation through a threaded connection. At the same time, it is easy to disassemble and assemble, facilitating the later inspection and replacement of the connecting rod, elastic sleeve structure and other components inside the mating port. Attached Figure Description

[0021] Figure 1 This is a structural diagram of a specific embodiment of the present utility model;

[0022] Figure 2 This is an internal structural diagram of a specific embodiment of the present utility model;

[0023] Figure 3 This is an assembly diagram of the power motor and two sets of fascia impact components according to a specific embodiment of the present utility model;

[0024] Figure 4 This is an exploded view of the fascia impact component according to a specific embodiment of the present invention;

[0025] Figure 5 This is a structural diagram of the power motor according to a specific embodiment of the present utility model;

[0026] Figure 6 This is a structural diagram of the eccentric component according to a specific embodiment of the present utility model;

[0027] Figure 7 This is a structural diagram of the eccentric component according to a specific embodiment of the present utility model;

[0028] Figure 8 This is a structural diagram of the elastic sleeve structure according to a specific embodiment of the present utility model;

[0029] Figure 9 This is a diagram showing the internal structure of a pair of elastic sleeves according to a specific embodiment of the present invention;

[0030] Figure 10 This is a first shell structure diagram of a specific embodiment of the present utility model;

[0031] Figure 11 This is a structural diagram of the second shell of a specific embodiment of the present utility model.

[0032] In the diagram: Main body 1, power motor 2, fascia impact assembly 3, connecting rod 32, assembly head 321, connecting end 322, assembly hole 323, eccentric part 33, eccentric shaft 331, shaft connection hole 332, fixing hole 333, output shaft 21, plane A211, positioning groove 2111, mating port 11, elastic sleeve structure 4, rear retaining ring 12, end cover 5, elastic sleeve 41, annular groove 42, core 43, plane B3321, gripping part 13, working part 14, long rod part 15, power supply 8, circuit board 9, control button 131, first shell 16, second shell 17, mounting cavity 18, power supply compartment 19, circuit board slot 10, compartment support plate 161, compartment cover plate 101, insertion post 162, insertion hole 171, assembly joint part 103. Detailed Implementation

[0033] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] like Figure 1-11 As shown, the present invention provides a double-headed fascia gun, comprising a main body 1, a power motor 2, and a fascia impact assembly 3. The power motor 2 is a double-headed motor, with output shafts 21 at both ends. The fascia impact assembly 3 consists of two sets, symmetrically arranged at both ends of the double-headed motor.

[0035] Each fascia impact assembly 3 includes a fascia head, a connecting rod 32, and an eccentric component 33. The fascia head can be selected from various types of conventional massage heads, not shown in the figure. An eccentric shaft 331 is integrally provided on the eccentric component 33. The central axis of the eccentric shaft 331 is eccentrically set relative to the central axis of the output shaft 21 of the power motor 2. One end of the connecting rod 32 is a connecting end 322, and the other end is provided with an assembly head 321 that is assembled with the fascia head. The connecting end 322 is rotatably sleeved on the eccentric shaft 331 and cooperates with it through a bearing. The eccentric component 33 is connected to the output shaft 21 of the power motor 2. The eccentric shaft 331 drives the fascia head to perform linear reciprocating motion through the connecting rod 32 to achieve linear impact.

[0036] The two fascia heads move in parallel directions and form a pre-set gap between them.

[0037] The eccentric shafts 331 of the two eccentric components 33 rotate at different positions, thereby causing the two fascia heads to perform alternating linear reciprocating motions in the front-back direction to achieve a kneading effect on the internal parts of the action gap. Of course, the two fascia heads can also perform synchronous linear reciprocating motions in the front-back direction.

[0038] Specifically, the assembly head 321 can reciprocate linearly through the corresponding mating opening 11 of the main body 1. An elastic sleeve structure 4 is installed between the outer periphery of the assembly head 321 and the inner wall of the mating opening 11. The assembly head 321 has an assembly hole 323 inside for inserting the fascia head component. The assembly hole of the connecting rod assembly head and the connecting end of the fascia head component are plugged in, realizing the rapid assembly of the fascia head component and the connecting rod. Specifically, the elastic sleeve structure 4 includes a pair of elastic sleeves 41, which are made of rubber or silicone. An annular groove 42 with an inner opening is formed between the opposite ends of the pair of elastic sleeves 41. A core 43 soaked in lubricating oil is installed in the annular groove 42. The inner rings of the pair of elastic sleeves 41 and the core 43 are in contact with the assembly head 321. The core is made of felt or cotton, which is convenient for absorbing and storing lubricating oil, and can provide lubrication for the reciprocating assembly head for a long time without frequent replenishment.

[0039] Specifically, the eccentric member 33 is provided with a shaft connection hole 332 for the output shaft 21 of the power motor 2 to be inserted. The outer wall of the output shaft 21 of the power motor 2 has a plane A211, and the inner wall of the shaft connection hole 332 of the eccentric member 33 has a plane B3321. The output shaft 21 and the shaft connection hole 332 are matched and engaged by the plane A211 and the plane B3321 to achieve circumferential positioning. The eccentric member 33 is provided with a fixing hole 333 that extends radially to the shaft connection hole 332. A locking member is inserted into the fixing hole 333 and abuts against the positioning groove 2111 on the plane A211 of the output shaft 21 to lock and fix the eccentric member 33 to the motor output shaft 21. The locking member is a screw or bolt.

[0040] Specifically, the main body 1 includes a gripping part 13, a working part 14, and a long rod part 15 with a curved structure, fixed or integrally connected between the gripping part 13 and the working part 14. The power motor 2 and the fascia impact component 3 are both arranged inside the working part 14, and the two fascia heads are arranged along the length of the working part 14. The gripping part 13 has a built-in power supply 8 and a circuit board 9 located on one side of the power supply 8. The gripping part 13 is provided with a control button 131, and the control button 131, the power motor 2, and the power supply 8 are all electrically connected to the circuit board 9. The long rod part 15 can be rigid or flexible, and can flexibly adjust the bending angle according to the user's needs for massaging different parts of the body. It can easily massage the back, shoulders, neck, and other parts that are difficult to reach by the user without changing the gripping posture, adapting to the needs of more massage scenarios and making the massage operation more flexible and free.

[0041] Specifically, the main body 1 includes a first shell 16 and a second shell 17 that are separately arranged. The first shell 16 and the second shell 17 are joined together to form an installation cavity 18. A power motor 2, a fascia impact component 3, a power supply 8, and a circuit board 9 are arranged in corresponding positions in the installation cavity 18. The power supply 8 is installed in a power supply compartment 19 formed by the joining of the first shell 16 and the second shell 17. The circuit board 9 is installed in a circuit board slot 10 formed by the joining of the first shell 16 and the second shell 17. The two ends of the power motor 2 are respectively supported and positioned in the compartment support plate 161 of the first shell 16 and covered by a compartment cover plate 101. The compartment cover plate is screwed to the compartment support plate. Specifically, the first shell 16 and the second shell 17 are connected by inserting a post 162 into a socket 171 and fastened with screws. The first shell has an integrally formed post on its inner side, and the second shell has an integrally formed socket at a corresponding position that matches the post. The insertion of the post and the socket achieves the pre-positioning of the two shells. After pre-positioning, screws are inserted at the pre-set holes on the mating edges of the two shells for fastening, so that the two shells fit together to form a complete main structure. Alternatively, the mating edges of the two shells are provided with mutually matching concave and convex interlocking structures for positioning through interlocking. The first shell 16 and the second shell 17 fit together to form an assembly joint 103, and the assembly joint 103 internally forms a connecting rod 3. 2. A through-hole 11 is provided. An end cap 5 is fitted on the front end of the assembly joint 103. The outer wall of the assembly joint formed by the first and second shells is provided with external threads, and the inner wall of the end cap is provided with matching internal threads. The end cap is screwed onto the outer side of the assembly joint to fix it to the main body. The end cap 5 has a hole at the corresponding through-hole 11. The elastic sleeve structure 4 is limited between the end cap 5 and the rear retaining ring 12 integrally formed on the inner wall of the main body 1. The two ends of the elastic sleeves of the elastic sleeve structure abut against the rear retaining ring and the inner side of the end cap respectively. After the end cap is tightened, it forms an axial compression on the elastic sleeve to realize the axial positioning of the elastic sleeve structure. The core is inserted into the annular groove between the two elastic sleeves.

[0042] The working principle of this utility model is as follows:

[0043] When using the massage gun, the user holds the handle and turns on the power. After turning it on, the user adjusts the speed of the motor according to their own tolerance using the control buttons. The user can easily align the two fascia heads with the muscles that need to be massaged without making significant adjustments to their hand position. Driven by the eccentric parts at both ends of the motor, the two fascia heads perform alternating linear reciprocating motions, creating alternating impacts on the target muscles sandwiched in between. When one side of the eccentric shaft rotates closer to the fascia head, the other side rotates further away from the fascia head. During the rotation of the eccentric shaft, the corresponding fascia head is driven to perform linear reciprocating motion through the connecting rod. At this time, the two fascia heads will form an alternating extension and contraction state, with one end extending forward and the other end retracting backward. The two fascia heads push and pull in the front-to-back direction, simulating the kneading and pinching effect of manual massage, which is more relaxing than the single-point impact of traditional single-head fascia guns. At the same time, the entire transmission structure directly transmits the motor power to the connecting rod through the eccentric part to drive the fascia head movement. The transmission path is short, the power loss is small, and the working noise is low. With the cushioning and lubrication of the elastic sleeve, the whole machine has little vibration when held, and there will be no discomfort of hand numbness even after holding it for a long time. The overall structure is simple, the failure rate is low, and maintenance is also very convenient.

[0044] It should be noted that in the description of this utility model, all directional indicators (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0045] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A double-headed fascia gun, comprising a main body (1), a power motor (2), and a fascia impact assembly (3), characterized in that: The power motor (2) is a dual-head motor, with output shafts (21) at both ends; the fascia impact assembly (3) has two sets, which are symmetrically arranged at both ends of the dual-head motor; Each group of fascial impact components (3) includes a fascial head, a connecting rod (32), and an eccentric component (33). The eccentric component (33) is provided with an eccentric shaft (331). The central axis of the eccentric shaft (331) is eccentrically set relative to the central axis of the output shaft (21) of the power motor (2). One end of the connecting rod (32) is a connecting end (322), and the other end is provided with an assembly head (321) that is assembled with the fascial head. The connecting end (322) is rotatably sleeved on the eccentric shaft (331). The eccentric component (33) is connected to the output shaft (21) of the power motor (2). The eccentric shaft (331) drives the fascial head to perform linear reciprocating motion through the connecting rod (32) to achieve linear impact. The two fascia heads move in parallel directions and form a pre-set gap between them. The eccentric shafts (331) of the two eccentric parts (33) are rotated at different positions, so that the two fascia heads make alternating linear reciprocating motions in the front and back direction to achieve the kneading effect on the internal part of the action gap.

2. The double-headed fascia gun according to claim 1, characterized in that: The assembly head (321) can be linearly reciprocated and passed through the corresponding mating port (11) of the main body (1). An elastic sleeve structure (4) is installed between the outer periphery of the assembly head (321) and the inner wall of the mating port (11). The assembly head (321) is provided with an assembly hole (323) for inserting and assembling the fascia head.

3. The double-headed fascia gun according to claim 2, characterized in that: The elastic sleeve structure (4) includes a pair of elastic sleeves (41), with an annular groove (42) with an inner ring opening formed between the opposite ends of the pair of elastic sleeves (41). A core (43) soaked in lubricating oil is installed in the annular groove (42), and the inner rings of the pair of elastic sleeves (41) and the core (43) are in contact with the assembly head (321).

4. The double-headed fascia gun according to claim 1, 2, or 3, characterized in that: The eccentric member (33) is provided with a shaft connection hole (332) for the output shaft (21) of the power motor (2) to be inserted. The outer wall of the output shaft (21) of the power motor (2) has a plane A (211), and the inner wall of the shaft connection hole (332) of the eccentric member (33) has a plane B (3321). The output shaft (21) and the shaft connection hole (332) are matched and engaged by the plane A (211) and the plane B (3321) to achieve circumferential positioning. The eccentric member (33) is provided with a fixing hole (333) that extends radially to the shaft connection hole (332). The locking member passes through the fixing hole (333) and abuts against the positioning groove (2111) on the plane A (211) of the output shaft (21) to lock and fix the eccentric member (33) to the motor output shaft (21).

5. The double-headed fascia gun according to claim 1, 2, or 3, characterized in that: The main body (1) includes a gripping part (13), a working part (14), and a long rod part (15) with a curved structure connected between the gripping part (13) and the working part (14); the power motor (2) and the fascia impact assembly (3) are both arranged inside the working part (14), and the two fascia heads are arranged along the length of the working part (14); the gripping part (13) has a built-in power supply (8) and a circuit board (9) located on one side of the power supply (8), and the gripping part (13) is provided with a control button (131), and the control button (131), the power motor (2) and the power supply (8) are all electrically connected to the circuit board (9).

6. The double-headed fascia gun according to claim 2 or 3, characterized in that: The main body (1) includes a first shell (16) and a second shell (17) that are separately set. The first shell (16) and the second shell (17) are joined together to form an installation cavity (18). A power motor (2), a fascia impact component (3), a power supply (8) and a circuit board (9) are arranged in the corresponding positions of the installation cavity (18). The power supply (8) is installed in the power supply compartment (19) formed by the joining of the first shell (16) and the second shell (17). The circuit board (9) is installed in the circuit board slot (10) formed by the joining of the first shell (16) and the second shell (17). The two ends of the power motor (2) are respectively supported in the compartment support plate (161) of the first shell (16) for positioning and covered by the compartment cover plate (101).

7. The double-headed fascia gun according to claim 6, characterized in that: The first shell (16) and the second shell (17) are connected by inserting a post (162) and inserting a hole (171) and fastened by screws; the first shell (16) and the second shell (17) are joined to form an assembly joint (103), the assembly joint (103) has a mating opening (11) for the connecting rod (32) to pass through, an end cap (5) is mounted on the front end of the assembly joint (103), the end cap (5) has a hole at the corresponding mating opening (11), and the elastic sleeve structure (4) is limited between the end cap (5) and the rear retaining ring (12) of the inner wall of the main body (1).

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