A wideband adaptive vibration isolation pedestal suitable for multi-head embroidery machine

Abstract

This application relates to a broadband adaptive vibration damping foot for multi-head embroidery machines, including a protective component and a vibration damping component disposed inside the protective component; the protective component forms a protective space for accommodating the vibration damping component; the vibration damping component includes a damper, a lower positioning cup, a main spring, an upper positioning cup, a positioning seat, a return spring, and a positioning sleeve. The stiffness of the main spring is different from that of the return spring. The positioning seat moves axially under the guidance of the positioning sleeve. The main spring and the return spring generate different elastic responses. The damper is used to dissipate vibration energy. By adjusting the initial compression of the main spring and the return spring, as well as the spring stiffness and damping parameters of the vibration damping foot at different positions, the vibration damping foot adapts to the different frequencies and amplitudes of vibrations generated by different heads and speeds of the multi-head embroidery machine, realizing graded elastic buffering and damping energy dissipation, reducing the machine body vibration and the transmission of vibration to the installation ground during the operation of the long-body multi-head embroidery machine, and improving the operational stability of the equipment.

Description

Technical Field

[0001] This application relates to the field of vibration reduction in embroidery machines, and in particular to a broadband adaptive vibration damping foot suitable for multi-head embroidery machines. Background Technology

[0002] An embroidery machine is a textile device used to create pre-set embroidery patterns on the surface of fabrics. It is widely used in clothing, home textiles, footwear, and decorative items. With increasing demands for embroidery techniques and production efficiency, multi-head embroidery machines are evolving towards longer bodies, more heads, higher operating speeds, and continuous production. A multi-head embroidery machine typically includes multiple heads spaced along the length of the machine body. Each head drives the needle bar, presser foot, and other components in high-speed reciprocating motion via a transmission mechanism. During actual operation, different heads may operate in different states depending on the embroidery pattern and work procedure, resulting in variations in their operating speed, start / stop status, and load, thus causing complex dynamic vibrations throughout the machine.

[0003] Existing multi-head embroidery machines typically use feet or vibration-damping pads at the bottom of the machine to contact the ground, supporting the weight of the machine and cushioning vibrations generated during operation. Traditional feet usually employ rubber pads, elastic pads, or simple spring structures with single stiffness, and their vibration damping performance is typically designed for a specific load or frequency range.

[0004] However, for embroidery machines with long bodies and multiple heads, different heads will generate excitation forces of different frequencies and amplitudes when operating at different speeds. Furthermore, the vibrations generated by multiple heads may overlap after being transmitted through the machine body, causing different degrees of vibration at different locations on the machine body. Additionally, when the embroidery machine is installed on a concrete floor, metal platform, wooden floor, or other foundations with varying rigidity, the support stiffness between the feet and the installation surface, as well as the vibration transmission characteristics, will also change.

[0005] Existing single-structure vibration damping feet are usually unable to adapt to the different vibration conditions mentioned above simultaneously. When the foot stiffness is set too high, although it can improve the support stability of the machine body, its ability to absorb and buffer some medium and high frequency vibrations is limited, and the vibration can easily be transmitted to the installation ground through the foot. When the foot stiffness is set too low, although it can improve the isolation effect of some low frequency vibrations, it can easily lead to a decrease in the support stability of the machine body, which may cause large machine body sway when multiple machine heads are not working synchronously or when the equipment is running at high speed.

[0006] Furthermore, the vibration damping characteristics of traditional vibration damping feet are usually relatively fixed, making it difficult to adjust their vibration damping state according to the operating speed of different machine heads, different operating loads, and different support conditions of the installation ground. This results in significant differences in the vibration damping effect of the same set of feet under different working environments. For long-body multi-head embroidery machines, the vibrations generated by each machine head may also propagate along the length of the machine body and form local vibration amplification, causing inconsistent vibration levels in different areas of the machine body, further affecting the operational stability of the equipment and the accuracy of embroidery processing.

[0007] Regarding the aforementioned technologies, the inventors believe that existing embroidery machine feet mainly suffer from problems such as a limited range of vibration reduction frequencies, insufficient adaptability to different vibration conditions, difficulty in balancing support stability and vibration absorption performance, and difficulty in adapting to the vibration transmission characteristics of different installation surfaces. Especially for embroidery machines with long bodies and numerous heads, how to enable the feet to effectively absorb and buffer vibrations of different frequencies generated by different head rotation speeds, and adapt to the support conditions of different installation surfaces, has become a technical problem that needs to be solved in this field. Summary of the Invention

[0008] In order to improve the technical problems of existing long-body multi-head embroidery machines, which are difficult to effectively absorb and buffer multi-frequency and complex vibrations generated under different machine head speeds, different working conditions and different installation ground conditions, and traditional footings have limited vibration reduction frequency range, insufficient adaptability and difficulty in balancing machine support stability and wide-frequency vibration reduction effect, this application provides a wide-frequency adaptive vibration reduction footing suitable for multi-head embroidery machines.

[0009] The broadband adaptive vibration damping foot for multi-head embroidery machines provided in this application adopts the following technical solution: A wideband adaptive vibration damping foot for multi-head embroidery machines includes a protective component and a vibration damping component disposed inside the protective component; The protective assembly includes a lower protective plate, a protective outer jacket, and a protective cover plate. The lower protective plate is used to contact the installation ground. The protective outer jacket is disposed above the lower protective plate, and the protective cover plate is disposed above the protective outer jacket. The lower protective plate, the protective outer jacket, and the protective cover plate together form a protective space for accommodating the shock absorption assembly. The shock absorption assembly includes a damper, a lower positioning cup, a main spring, an upper positioning cup, a positioning seat, a return spring, and a positioning sleeve; The fixed end of the damper is connected to the lower protective plate, the damping end of the damper is connected to the lower positioning cup, the two ends of the main spring abut against the lower positioning cup and the upper positioning cup respectively, and the upper positioning cup is connected to the positioning seat; The positioning seat is movably disposed along the bearing direction of the lower protective plate, the positioning sleeve is sleeved on the outside of the positioning seat and guides the movement direction of the positioning seat, and the return spring is disposed between the positioning seat and the positioning sleeve. The stiffness of the main spring is different from that of the return spring. The main spring is used to bear the main static load and dynamic load of the multi-head embroidery machine body. The return spring is used to provide auxiliary elastic restoring force after the positioning seat is displaced. The damper is used to dissipate the vibration energy generated when the main spring and the return spring undergo elastic deformation. The main spring, the return spring, and the damper together form a composite vibration reduction structure with different elastic response ranges, so that the vibration reduction foot can produce different degrees of elastic deformation and damping buffer for different frequency vibrations generated by different machine heads operating at different speeds in a multi-head embroidery machine.

[0010] By adopting the above technical solution, a composite elastic support is formed by using main springs and return springs with different stiffnesses, and combined with a damper to dissipate vibration energy. This gives the vibration damping foot a graded elastic deformation and damping buffering capacity, which can adaptively absorb and buffer vibrations of different frequencies and amplitudes generated by different machine heads operating at different speeds in multi-head embroidery machines. At the same time, the positioning sleeve guides the positioning seat to ensure the stability of the load transmission direction during vibration damping, reduce machine body vibration and vibration transmission to the installation ground, and improve the overall stability and vibration damping effect of long-body multi-head embroidery machines during operation.

[0011] Optionally, a first threaded seat is fixedly provided on the top of the lower protective plate, and the lower end of the protective outer sleeve is threadedly connected to the first threaded seat; The top of the protective jacket is fixedly provided with a second threaded seat, and the protective cover plate is threadedly connected to the second threaded seat; The first threaded seat and the second threaded seat are respectively used to adjust the assembly position between the protective outer jacket, the protective lower plate, and the protective cover plate to form a preset installation space for the shock absorption assembly.

[0012] By adopting the above technical solution, the adjustable connection between the lower protective plate, the outer protective plate, and the protective cover plate is realized by using the first threaded seat and the second threaded seat respectively. This gives the protective components good assembly flexibility and allows the axial height of the protective space to be adjusted according to the size and installation status of the shock-absorbing components, providing suitable installation space for the shock-absorbing components. At the same time, the threaded connection structure facilitates the disassembly and maintenance of the outer protective plate and the protective cover plate, improving the assembly accuracy, ease of use, and maintenance efficiency of the vibration damping feet.

[0013] Optionally, the axial assembly position between the protective cover and the protective outer sleeve can be adjusted by the second threaded seat to change the relative installation position between the positioning sleeve and the positioning seat, thereby changing the initial compression of the return spring; By adjusting the initial compression of the return spring, the return spring can have different preloads when the vibration damping foot is in a vibration-free state, in order to adapt to multi-head embroidery machine bodies of different weights and different installation ground support conditions.

[0014] By adopting the above technical solution, the axial assembly position between the protective cover and the protective jacket can be adjusted by using the second threaded seat, thereby changing the relative position of the positioning sleeve and the positioning seat. This allows for the adjustment of the initial compression and preload of the return spring, enabling the vibration damping foot to adjust its initial support state according to the weight of the multi-head embroidery machine and the support difference of the installation ground. At the same time, it improves the response capability of the return spring to the vibration of the machine body, allowing the foot to maintain stable support under different load conditions and achieve a better vibration damping effect.

[0015] Optionally, a third threaded seat is fixedly provided on the top of the lower protective plate, and the fixed end of the damper is threadedly connected to the third threaded seat; The damping end of the damper is fixedly provided with a fourth threaded seat, and the lower positioning cup is threadedly connected to the fourth threaded seat; By adjusting the connection position between the damper and the third threaded seat, and the connection position between the lower positioning cup and the fourth threaded seat, the relative installation positions between the damper, the main spring, and the positioning seat are changed, thereby adjusting the initial compression state of the damping assembly.

[0016] By adopting the above technical solution, the axial connection positions between the damper and the lower protective plate, as well as between the lower positioning cup and the damper, can be adjusted using the third and fourth threaded seats respectively. This changes the relative installation positions between the damper, the main spring, and the positioning seat, thereby adjusting the initial compression state of the damping components. This ensures that the main spring and the damper are in a suitable working state after the equipment is installed. At the same time, it facilitates the adjustment of the initial support force and working stroke of the damping feet according to different machine loads, improving the adaptability and stability of the damping structure.

[0017] Optionally, a fifth threaded seat is fixedly provided at the bottom of the positioning seat, and the upper positioning cup is threadedly connected to the fifth threaded seat; The two ends of the main spring abut against the lower positioning cup and the upper positioning cup, respectively. The fifth threaded seat is used to adjust the relative axial position between the upper positioning cup and the positioning seat to change the initial compression of the main spring.

[0018] By adopting the above technical solution, the relative axial position between the upper positioning cup and the positioning seat is adjusted by using the fifth threaded seat, thereby changing the initial compression and preload of the main spring. This allows the main spring to be adaptively adjusted according to the weight of the multi-head embroidery machine body and the load differences at different support positions. At the same time, the lower and upper positioning cups limit and position both ends of the main spring, ensuring the stability of the main spring during compression, reducing the main spring offset or tilt, and improving the load-bearing capacity and vibration damping stability of the vibration damping foot.

[0019] Optionally, the stiffness of the main spring is greater than that of the return spring. The main spring is used to form the main load-bearing and low-frequency vibration buffering part of the vibration damping foot, and the return spring is used to form the auxiliary elastic buffering and reset part. When the multi-head embroidery machine generates low-amplitude vibration, the return spring and the main spring undergo small-amplitude elastic deformation; when the multi-head embroidery machine generates large-amplitude vibration, the compression of the main spring increases, and the vibration energy dissipation is increased through the damper, so as to form a graded vibration reduction response under different load conditions.

[0020] By adopting the above technical solution, a composite elastic support structure with different stiffness is formed between the main spring and the return spring. When the multi-head embroidery machine vibrates at low amplitude, it is buffered by two levels of elastic elements. When the vibration amplitude is large, the main spring is used to further compress and dissipate the vibration energy in conjunction with the damper, thereby forming a graded vibration reduction response that varies with the vibration amplitude. At the same time, it takes into account the machine body load-bearing and vibration buffering requirements, expands the effective working range of the vibration damping feet, reduces resonance and vibration amplification under different operating conditions, and improves the operating stability of long-body multi-head embroidery machines.

[0021] Optionally, the positioning sleeve is fitted onto the outside of the positioning seat, and the return spring is located between the positioning seat and the positioning sleeve; The positioning seat can reciprocate along the axial direction under the guidance of the positioning sleeve, and the positioning sleeve restricts the radial offset of the positioning seat; The main spring and the return spring correspond to different axial compression strokes, so that the positioning seat has different axial displacement ranges under different vibration amplitudes, thereby forming a vibration reduction structure with graded compression strokes.

[0022] By adopting the above technical solution, the positioning sleeve guides the positioning seat axially and restricts its radial offset, so that the positioning seat maintains stable axial movement during vibration, avoiding uneven spring force or jamming of the damping component due to sway. At the same time, the main spring and the return spring have different compression strokes, which can produce different degrees of elastic deformation according to the vibration amplitude, thereby forming a graded compression and graded buffering effect, expanding the effective working stroke of the damping foot, and improving the adaptability to different amplitude vibrations of multi-head embroidery machines.

[0023] Optionally, the damper is a damper with different damping coefficients for different feet, and the damping force of the damper can be adjusted according to the axial displacement speed of the positioning seat so that the damper can provide different vibration energy dissipation capabilities at different vibration frequencies corresponding to different operating speeds of the multi-head embroidery machine.

[0024] By adopting the above technical solution, the vibration damping feet set at different support positions of the multi-head embroidery machine can be configured with dampers of different damping coefficients according to the vibration characteristics of the corresponding positions, thereby forming differentiated damping support. At the same time, the dampers generate corresponding damping forces according to the axial displacement velocity of the positioning seat, and specifically dissipate energy for vibrations of different frequencies and amplitudes generated at different operating speeds, thereby enhancing the ability to suppress local and overall vibrations of the machine body, reducing the propagation of vibration energy along the machine body and the installation ground, and improving the operational stability of the multi-head embroidery machine.

[0025] Optionally, a shock-absorbing pad is provided on the outer side of the lower protective plate, and the shock-absorbing pad is located between the lower protective plate and the installation ground; The elastic stiffness of the shock-absorbing pad is less than that of the main spring, and it is used to absorb the relative vibration between the lower protective plate and the installation ground, so as to reduce the transmission of vibration generated by the multi-head embroidery machine to the installation ground. The shock-absorbing pad, the main spring, the return spring, and the damper form a multi-stage vibration reduction path along the load transmission direction of the multi-head embroidery machine.

[0026] By adopting the above technical solution, a damping pad with low elastic stiffness is set between the protective lower plate and the installation ground, which can further buffer the high-frequency and small-amplitude relative vibrations generated between the foot and the ground, reducing the direct transmission of vibration to the installation ground; at the same time, the damping pad, main spring, return spring and damper form a multi-stage series vibration reduction path, which absorbs and dissipates vibration energy in stages through the synergistic effect of different elastic elements and damping elements, expands the vibration reduction frequency range, and improves the adaptability to the complex vibration conditions of multi-head embroidery machines.

[0027] Optionally, the vibration damping feet are set at different support positions at the bottom of the multi-head embroidery machine body. The vibration damping feet located at different positions along the length of the machine body have different main spring stiffness, return spring stiffness, main spring preload, return spring preload and / or damping parameters. Among them, the vibration damping feet near the middle of the multi-head embroidery machine body are configured with vibration damping components with large load-bearing stiffness, while the vibration damping feet near the end of the machine body are configured with vibration damping components with large vibration buffer stroke, so as to form differentiated vibration damping support according to the vibration response differences at different positions of the machine body. Multiple vibration damping feet work together to absorb, buffer, and dissipate vibrations of different frequencies and amplitudes generated at different locations on the machine body in different areas, thereby reducing the vibrations propagating along the length of the machine body and the amplification of local vibrations during the operation of a long-body multi-head embroidery machine.

[0028] By adopting the above technical solution, based on the differences in vibration response at different positions of the long body of the multi-head embroidery machine, the spring stiffness, preload, and damping parameters of each vibration damping foot are configured differently, so that different support positions have load-bearing and buffering capabilities that match their vibration characteristics; by strengthening the load-bearing capacity in the middle and increasing the buffer stroke at the ends, the absorption and dissipation of local and overall vibrations are achieved, reducing the vibration propagation along the length of the machine body and the amplification of local vibrations, thereby improving the overall stability and vibration reduction effect of the long-body multi-head embroidery machine during operation.

[0029] In summary, this application includes at least one of the following beneficial technical effects: By using main springs and return springs with different stiffnesses in conjunction with dampers, the vibration damping feet can have different elastic response ranges. This allows for graded buffering and energy dissipation of vibrations of different frequencies and amplitudes generated by different heads and different operating speeds of multi-head embroidery machines, thereby expanding the effective vibration reduction range of the vibration damping feet.

[0030] By adjusting the axial installation position of the relevant components through the first, second, third, fourth, and fifth threaded seats, the initial compression of the return spring and the main spring can be changed respectively. This allows the vibration damping feet to adjust the initial support state according to the weight of the multi-head embroidery machine body and the load differences at different support positions, thereby improving the adaptability of the vibration damping structure.

[0031] The main spring bears the main load, while the return spring provides auxiliary buffering and reset functions. Under low-amplitude and large-amplitude vibration conditions, it forms different degrees of elastic deformation and, together with the damper, dissipates vibration energy, thereby reducing vibration amplitude and vibration amplification.

[0032] The positioning seat moves axially and is guided and radially limited by the positioning sleeve, which can reduce the lateral offset and sway of the positioning seat during vibration, keep the main spring, return spring and damper under stable force, and improve the working reliability and service life of the vibration damping foot.

[0033] The vibration damping feet at different support positions can be configured with dampers of different damping coefficients to match the damping force with the displacement speed of the positioning seat, thereby providing differentiated energy dissipation for vibrations of different frequencies and amplitudes generated by different engine head operating speeds, and enhancing the suppression effect on local vibrations of the engine body.

[0034] The shock-absorbing pad, together with the main spring, return spring and damper, forms a multi-stage vibration reduction path, which can further absorb the relative vibration between the foot and the installation ground, and reduce the transmission of vibration generated by the multi-head embroidery machine to the installation ground.

[0035] Based on the vibration response at different positions along the length of the multi-head embroidery machine, the spring stiffness, preload, buffer stroke, and damping parameters of each vibration damping foot are set differently. This ensures that the middle part of the machine body has a strong load-bearing capacity and the ends of the machine body have a large vibration buffering capacity. In this way, vibrations at different positions are absorbed, buffered, and dissipated in different areas, reducing the propagation of vibrations along the long machine body and the amplification of local vibrations, thereby improving the operational stability of the multi-head embroidery machine. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a wideband adaptive vibration damping foot for multi-head embroidery machines proposed in the embodiments of this application; Figure 2 This is a schematic diagram of the internal structure of the broadband adaptive vibration damping foot for multi-head embroidery machines proposed in the embodiments of this application; Figure 3 This is a cross-sectional structural schematic diagram of the broadband adaptive vibration damping foot for multi-head embroidery machines proposed in the embodiments of this application; Figure 4 This is a schematic diagram of the disassembly structure of the broadband adaptive vibration damping foot for multi-head embroidery machines proposed in the embodiments of this application. Figure 1 .

[0037] Figure 5 This is a schematic diagram of the disassembly structure of the broadband adaptive vibration damping foot for multi-head embroidery machines proposed in the embodiments of this application. Figure 2 .

[0038] Explanation of reference numerals in the attached drawings: 1. Protective component; 101. Lower protective plate; 102. First threaded seat; 103. Protective outer sleeve; 104. Second threaded seat; 105. Protective cover plate; 106. Third threaded seat; 107. Shock-absorbing pad; 2. Shock-absorbing component; 201. Damper; 202. Fourth threaded seat; 203. Lower positioning cup; 204. Main spring; 205. Upper positioning cup; 206. Positioning seat; 207. Fifth threaded seat; 208. Return spring; 209. Positioning sleeve. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0040] This application discloses a wideband adaptive vibration damping foot for multi-head embroidery machines. For example... Figures 1 to 4As shown, the vibration damping feet are set at the bottom of the multi-head embroidery machine body to support the weight of the multi-head embroidery machine body and absorb, buffer and dissipate vibrations of different frequencies and amplitudes generated during the operation of the multi-head embroidery machine. The vibration damping feet include a protective component 1 and a shock-absorbing component 2 set inside the protective component 1. The protective component 1 is mainly used to form the installation and protection space for the shock absorber component 2 and to isolate the shock absorber component 2 from the external environment. The shock absorber component 2 is used to bear the load transmitted by the body of the multi-head embroidery machine and to reduce the vibration of the machine body through elastic deformation and damping energy dissipation. The protective component 1 includes a lower protective plate 101, a protective outer jacket 103 and a protective cover plate 105. The lower protective plate 101 serves as the bottom load-bearing structure of the shock absorber foot. Its bottom is used to contact the installation ground, and its top is used to install the shock absorber component 2. The protective outer jacket 103 is set above the lower protective plate 101, and the protective cover plate 105 is set on top of the protective outer jacket 103. The lower protective plate 101, the protective outer jacket 103 and the protective cover plate 105 together form a protective space for accommodating the shock absorber component 2. By setting the shock absorber component 2 inside the protective component 1, the shock absorber component 2 can be prevented from being directly exposed to the external environment, reducing the possibility of dust, fiber debris and other foreign objects entering the interior of the shock absorber component 2. At the same time, it can prevent the shock absorber component 2 from being subjected to external collisions and improve the long-term reliability of the shock absorber foot. A first threaded seat 102 is fixedly provided on the top of the lower protective plate 101. The lower end of the protective outer sleeve 103 is threadedly connected to the first threaded seat 102, so that the protective outer sleeve 103 can be installed on the lower protective plate 101. A second threaded seat 104 is fixedly provided on the top of the protective outer sleeve 103. The protective cover plate 105 is threadedly connected to the second threaded seat 104, so that the protective cover plate 105 can be installed on the top of the protective outer sleeve 103. Through the threaded connection structure formed by the first threaded seat 102 and the second threaded seat 104, a detachable structure is formed between the lower protective plate 101, the protective outer sleeve 103 and the protective cover plate 105. When the shock absorber 2 needs to be repaired, replaced or adjusted, the protective cover plate 105 can be removed from the second threaded seat 104 and the protective outer sleeve 103 can be removed from the first threaded seat 102, thereby exposing the shock absorber 2, which facilitates the maintenance of the damper 201, the main spring 204 and the return spring 208. The first threaded seat 102 and the second threaded seat 104 can also adjust the installation space inside the protective assembly 1 by changing the axial position of the threaded connection, so that the protective assembly 1 can adapt to the shock-absorbing assembly 2 of different specifications. A shock-absorbing pad 107 is also provided on the outer side of the lower protective plate 101. The shock-absorbing pad 107 is disposed between the lower protective plate 101 and the installation ground to form an elastic contact layer between the lower protective plate 101 and the installation ground. When the multi-head embroidery machine vibrates during operation, some of the vibration is transmitted to the shock-absorbing pad 107 through the lower protective plate 101. The shock-absorbing pad 107 undergoes elastic deformation and absorbs some of the vibration energy, thereby reducing the transmission of vibration to the installation ground. Since different installation grounds have different stiffnesses, such as concrete ground, steel installation platform or other foundation grounds with different elastic properties, the damping pad 107 can serve as a flexible transition structure between the damping foot and the installation ground, reducing the adverse effects of different ground support conditions on the damping effect.

[0041] The shock absorption assembly 2 is disposed in the protective space formed by the lower protective plate 101, the protective outer jacket 103 and the protective cover plate 105. The shock absorption assembly 2 includes a damper 201, a lower positioning cup 203, a main spring 204, an upper positioning cup 205, a positioning seat 206, a return spring 208 and a positioning sleeve 209. A third threaded seat 106 is fixedly disposed on the top of the lower protective plate 101. The fixed end of the damper 201 is connected to the third threaded seat 106, thereby fixing the damper 201 on the lower protective plate 101. The damping end of the damper 201 is fixedly equipped with a fourth threaded seat 202. A lower positioning cup 203 is connected to the fourth threaded seat 202. The lower positioning cup 203 is used to receive the lower end of the main spring 204 and transmit the elastic load generated by the main spring 204 to the damper 201. The main spring 204 is located between the lower positioning cup 203 and the upper positioning cup 205. The lower end of the main spring 204 abuts against the lower positioning cup 203, and the upper end of the main spring 204 abuts against the upper positioning cup 205. Positioning seat 206... The upper positioning bowl 205 is positioned above the positioning seat 206, and the bottom of the positioning seat 206 is fixedly provided with a fifth threaded seat 207. The upper positioning bowl 205 is connected to the fifth threaded seat 207, thereby forming a connection between the upper positioning bowl 205 and the positioning seat 206. The positioning seat 206 is used to connect with the body of the multi-head embroidery machine or to bear the load transmitted by the machine body. When the body of the multi-head embroidery machine is subjected to vertical vibration, the load of the machine body is transmitted to the positioning seat 206, causing the positioning seat 206 to produce a corresponding axial displacement.

[0042] The positioning sleeve 209 is fitted onto the outside of the positioning seat 206 to guide and limit its movement. Under the constraint of the positioning sleeve 209, the positioning seat 206 can reciprocate along the bearing direction of the vibration-damping foot. Simultaneously, the positioning sleeve 209 restricts the positioning seat 206 from significant radial displacement, allowing it to primarily move axially. The return spring 208 is positioned between the positioning seat 206 and the positioning sleeve 209, and is fitted onto the outside of the positioning seat 206. When the positioning seat 206 is subjected to vibration loads from the multi-head embroidery machine body, it will cause axial displacement. When the positioning seat 206 moves, the return spring 208 undergoes elastic compression or elastic recovery, generating an elastic restoring force opposite to the displacement direction of the positioning seat 206. When the external vibration load decreases or disappears, the return spring 208 releases the stored elastic potential energy, pushing the positioning seat 206 back to its initial position. Through the cooperation of the positioning sleeve 209 and the return spring 208, the sway of the positioning seat 206 can be limited on the one hand, and the reset speed of the positioning seat 206 can be increased on the other hand, so that the damping component 2 can maintain a stable working state under continuous vibration conditions.

[0043] In this embodiment, the main spring 204 and the return spring 208 are elastic elements with different stiffnesses. The stiffness of the main spring 204 is greater than that of the return spring 208. The main spring 204 mainly bears the static weight of the multi-head embroidery machine body and the main dynamic load during operation. The return spring 208 is mainly used to provide auxiliary elastic support and reset function. When the multi-head embroidery machine is in normal working condition, the weight of the machine body is transmitted to the lower protective plate 101 through the positioning seat 206, the upper positioning bowl 205, the main spring 204, the lower positioning bowl 203 and the damper 201. When the machine head of the multi-head embroidery machine generates a small amplitude high-frequency vibration, the positioning seat 206 generates a small axial displacement, and the main spring 204 and the return spring 208 undergo corresponding elastic deformation to buffer the small amplitude vibration. When multiple machine heads are running at the same time or the machine head running speed is increased, causing the machine body to generate a larger amplitude vibration, the displacement of the positioning seat 206 increases, the main spring 204 generates a large compression deformation, and transmits a large dynamic load to the damper 201. Because the main spring 204 and the return spring 208 have different stiffnesses, they produce different elastic responses under the same displacement conditions, resulting in different elastic response ranges for the vibration damping feet. This avoids the problem that using a single stiffness spring only has a good vibration damping effect for a certain vibration condition, and allows the vibration damping feet to adapt to different frequencies of vibration generated by different heads and different speeds of multi-head embroidery machines.

[0044] In this embodiment, the initial installation state of the shock-absorbing component 2 can be adjusted through the threaded connection structure of the protective component 1. The protective outer sleeve 103 is connected to the protective lower plate 101 through the first threaded seat 102, and the protective cover plate 105 is connected to the protective outer sleeve 103 through the second threaded seat 104. By changing the axial installation position of the protective cover plate 105 relative to the protective outer sleeve 103, the initial relative position between the positioning sleeve 209, the positioning seat 206, and the return spring 208 can be changed, thereby changing the initial compression of the return spring 208. In the actual installation process, the initial preload of the return spring 208 can be adjusted according to the weight of the multi-head embroidery machine body, the number of machine heads, and the position of the shock-absorbing foot. For locations with heavy loads, the initial preload of the return spring 208 can be appropriately increased to improve the initial support capacity of the vibration damping foot. For locations requiring a larger dynamic buffer stroke, the initial preload of the return spring 208 can be appropriately reduced to give the positioning seat 206 more dynamic movement space. Furthermore, through the connection between the fifth threaded seat 207 and the upper positioning bowl 205, the position of the upper positioning bowl 205 relative to the positioning seat 206 can be adjusted, thereby changing the initial compression of the main spring 204. Therefore, in this embodiment, the initial working state of the main spring 204 and the return spring 208 can be adjusted respectively, so that the vibration damping foot can adapt to multi-head embroidery machines of different weights and different installation positions.

[0045] Since the main spring 204 and the return spring 208 have different stiffnesses and are located in different structural positions, the positioning seat 206 has different elastic responses under different vibration amplitudes. Under small vibration conditions, the positioning seat 206 produces a small axial movement, and the main spring 204 and the return spring 208 are slightly compressed, which is mainly used to absorb the small periodic vibrations generated by the high-speed reciprocating motion of the machine head. As the vibration amplitude increases, the axial movement of the positioning seat 206 increases, the compression of the main spring 204 further increases, and the vibration damping foot enters a larger elastic buffer stroke. When a large impact load occurs, the main spring 204 and the return spring 208 together generate a large elastic deformation, while the damper 201 generates a large damping effect to suppress the rapid movement of the positioning seat 206. Therefore, the main spring 204, the return spring 208, and the damper 201 form a vibration reduction path of graded compression and graded energy dissipation.

[0046] In this embodiment, the damper 201 can adopt different damping coefficients depending on the installation position of the vibration damping foot on the body of the multi-head embroidery machine. Since different heads of the long-body multi-head embroidery machine may have different operating speeds and operating states, the excitation force generated at different positions of the machine body is not exactly the same. For example, in areas where the heads are concentrated or where the operating speed is high, a damper 201 with a larger damping coefficient can be used to improve the vibration energy dissipation capability; in areas where the vibration amplitude is relatively small, a damper 201 with a smaller damping coefficient can be used to ensure that the positioning seat 206 maintains a better elastic response capability.

[0047] Furthermore, the damper 201 can generate a corresponding damping force according to the axial movement speed of the positioning seat 206. When the movement speed of the positioning seat 206 increases, the damping effect generated by the damper 201 is enhanced, thereby suppressing the rapid movement of the positioning seat 206. When the movement speed of the positioning seat 206 decreases, the damping effect is correspondingly weakened, so that the vibration damping component 2 can maintain a normal elastic recovery process. Thus, different vibration damping feet can be configured with different damping parameters according to the actual installation position, so that the bottom of the whole machine forms a vibration damping support system with differentiated damping characteristics.

[0048] For multi-head embroidery machines with long bodies, multiple vibration-damping feet as described in this application can be installed along the length of the machine body. Since the load and vibration response differ at the middle of the machine body, the ends of the machine body, and the corresponding positions of each head, vibration-damping feet at different positions can adopt different structural parameters. For example, vibration-damping feet near the middle of the machine body bear a larger machine body load and can be configured with a main spring 204 with higher stiffness, and the initial preload of the main spring 204 can be appropriately increased to improve support capacity. Vibration-damping feet near the ends of the machine body can be configured with a main spring 204 and a return spring with a larger dynamic buffer stroke. 208, which enables the end to have better elastic buffering capacity when subjected to vibration. At the position corresponding to the high-speed running head, a damper 201 with a larger damping coefficient can be configured to improve the vibration dissipation capacity at this position. At the position corresponding to the less vibrating head, a damper 201 with a relatively smaller damping coefficient can be used to keep the vibration damping foot seat with a higher elastic response capacity. Through the above differentiated configuration, the vibration reduction parameters can be set according to the vibration characteristics of different areas of the long fuselage, thereby reducing the propagation of vibration along the length of the fuselage and reducing the possibility of vibration amplification in local areas.

[0049] In this embodiment of the application, a wideband adaptive vibration damping foot is used for multi-head embroidery machines. When working, multiple vibration damping feet are first installed on the bottom of the multi-head embroidery machine body, and the vibration damping pad 107 under the protective lower plate 101 is in contact with the installation ground. During the operation of the multi-head embroidery machine, each head performs high-speed reciprocating motion according to the corresponding working procedure. Since the operating speed and operating state of different heads may be different, different frequencies and different amplitudes of excitation force are generated. The excitation force is transmitted through the machine body to the positioning seat 206, causing the positioning seat 206 to move axially along the guide direction of the positioning sleeve 209; When the positioning seat 206 moves, it drives the upper positioning bowl 205 to move, causing the main spring 204 to be compressed or released; at the same time, the return spring 208 undergoes elastic deformation along with the positioning seat 206. For small-amplitude, high-frequency vibrations, the main spring 204 and the return spring 208 absorb vibration energy through small-amplitude elastic deformation; For larger amplitude vibrations, the main spring 204 generates greater compression and transmits the dynamic load to the lower positioning cup 203 and the damper 201. The damper 201 dissipates some mechanical energy through damping, thereby reducing the vibration amplitude of the positioning seat 206. When the vibration load disappears or decreases, the main spring 204 and the return spring 208 release the stored elastic potential energy, causing the positioning seat 206 to return to its initial working position. The damper 201 then suppresses the rebound process of the positioning seat 206, reducing the secondary vibration generated during the rebound process. At the same time, the shock-absorbing pad 107 further absorbs the vibration between the lower protective plate 101 and the installation ground, thereby forming: Machine body → Positioning seat 206 → Upper positioning cup 205 → Main spring 204 → Lower positioning cup 203 → Damper 201 → Lower protective plate 101 → Vibration damping pad 107 → Multi-stage vibration transmission and energy dissipation path on the installation ground; Thus, through the synergistic effect of the main spring 204, the return spring 208, the damper 201, and the damping pad 107, vibrations of different frequencies and amplitudes are elastically buffered and damped to dissipate energy, thereby achieving wideband vibration reduction.

[0050] Alternative Implementation Scheme 1: Multi-stage Stiffness Spring Configuration Scheme Based on the above embodiments, this application also provides an alternative implementation scheme.

[0051] In this alternative implementation, the main spring 204 and the return spring 208 still use springs with different stiffnesses, but according to the actual load requirements of the multi-head embroidery machine, the main spring 204 can be set as a composite spring structure formed by a combination of elastic segments with different stiffnesses. For example, the main spring 204 may include a first elastic segment and a second elastic segment, which are arranged sequentially along the axial direction. The first elastic segment and the second elastic segment have different spring stiffnesses. When the positioning seat 206 undergoes a small displacement, the elastic segment with lower stiffness mainly deforms, enabling the vibration damping foot to flexibly buffer small vibrations. When the positioning seat 206 moves further and enters a larger compression stroke, the elastic segment with higher stiffness participates in bearing the load, thereby improving the vibration damping foot's ability to support larger dynamic loads. This alternative solution can further form a multi-level stiffness variation elastic response structure, giving the vibration damping foot a wider working range. In this alternative, the other structures are the same as in the above embodiment, still including protective component 1, damper 201, lower positioning cup 203, main spring 204, upper positioning cup 205, positioning seat 206, reset spring 208, positioning sleeve 209 and shock-absorbing pad 107.

[0052] Alternative Implementation Scheme 2: Adjustable Damping and Regional Configuration Scheme In another alternative implementation, the damper 201 adopts a damping structure with damping adjustment function. The damper 201 is provided with a damping adjustment part. By changing the flow cross section of the damping medium or the damping working parameters, the damper 201 can have different damping coefficients. In actual use, the dampers 201 of multiple vibration damping feet can be set according to the operating speed of each head of the multi-head embroidery machine and the vibration intensity of different positions of the machine body. For example, for the vibration damping feet corresponding to the high-speed running head, the damper 201 is set to a larger damping parameter so that the positioning seat 206 generates a larger damping force during high-speed movement, thereby quickly dissipating vibration energy. For the vibration damping feet corresponding to the low-speed machine head, the damper 201 is set to a smaller damping parameter, so that the positioning seat 206 has better elastic movement capability. Furthermore, according to the vibration distribution along the length of the multi-head embroidery machine body, the vibration damping feet located in the middle, end and concentrated areas of the machine head are respectively set with different main spring 204 stiffness, return spring 208 stiffness, main spring 204 preload, return spring 208 preload and damper 201 damping parameters. This forms a regional vibration damping system with "different damping parameters for different positions", so that multiple vibration damping feet no longer use the same vibration damping characteristics, but are configured in a targeted manner according to the actual vibration response of different areas of the machine body.

[0053] The implementation principle of a broadband adaptive vibration damping foot for a multi-head embroidery machine according to an embodiment of this application is as follows: When the multi-head embroidery machine is running, different heads operate at different running states and speeds, generating vibrations of different frequencies and amplitudes. The vibration load is transmitted to the positioning seat 206 through the machine body, causing the positioning seat 206 to move axially under the guidance of the positioning sleeve 209. The positioning seat 206 compresses the main spring 204 through the upper positioning cup 205, and at the same time drives the return spring 208 to undergo elastic deformation. The main spring 204 and the return spring 208 form different elastic response ranges using different stiffnesses. The movement of the positioning seat 206 further drives the damper 201 to work, dissipating the vibration mechanical energy through damping. The vibration damping pad 107 further reduces the transmission of vibration to the installation ground. Meanwhile, the adjustable connection structure formed by the first threaded seat 102, the second threaded seat 104, the third threaded seat 106, the fourth threaded seat 202, and the fifth threaded seat 207 allows for adjustment of the installation space of the vibration damping feet, the initial compression state of the spring, and the working position of the vibration damping component 2. By configuring vibration damping feet with different stiffness, different preload, and different damping coefficients at different positions, differentiated vibration damping can be achieved for the vibration characteristics of different areas of the long-body multi-head embroidery machine. Therefore, this application can generate different elastic deformation and damping energy dissipation responses under different working conditions such as small-amplitude high-frequency vibration, medium-amplitude vibration and large-amplitude dynamic impact. Combined with the differentiated parameter configuration at different positions of the long body, it can improve the overall operating stability of the multi-head embroidery machine and reduce body vibration, local vibration amplification and vibration transmission to the installation ground.

[0054] Alternative Option 3 Based on the above implementation methods, such as Figure 5 As shown, this application also provides a wideband adaptive vibration damping foot with multi-parameter independent adjustment function. In this alternative solution, while keeping the basic structure of the protective component 1, main spring 204, return spring 208, positioning seat 206, positioning sleeve 209 and damper 201 unchanged, the return spring preload, main spring preload, overall working height and damping parameters of the vibration damping foot are adjusted to further adapt to multi-head embroidery machines of different specifications, different body lengths and different operating conditions. Specifically, the upper part of the protective outer sleeve 103 is provided with a second threaded seat 104, and the protective cover plate 105 is threadedly engaged with the second threaded seat 104. By rotating the second threaded seat 104, the protective cover plate 105 moves up and down along the axial direction of the vibration damping foot, thereby changing the relative position between the protective cover plate 105 and the positioning sleeve 209. When the protective cover plate 105 moves downward, the positioning sleeve 209 can further compress the return spring 208, causing the return spring 208 to form a larger initial preload; when the protective cover plate 105 moves upward, the initial compression of the return spring 208 can be reduced. Therefore, the preload of the return spring 208 can be continuously adjusted through the second threaded seat 104, allowing the return spring 208 to have different initial elastic support states.

[0055] like Figure 5 As shown in the pre-pressure adjustment ①, the operator changes the axial position of the protective cover 105 by rotating the second threaded seat 104, so that the protective cover 105 drives the positioning sleeve 209 to change position relative to the positioning seat 206, thereby changing the initial compression of the return spring 208. In this way, the initial pre-pressure of the return spring 208 can be adjusted according to the weight of the multi-head embroidery machine body, the number of machine heads, and the support conditions of the installation ground. Furthermore, a third threaded seat 106 is provided on the upper part of the lower protective plate 101. The third threaded seat 106 is connected to the fixed end of the damper 201. By rotating the third threaded seat 106, the axial installation position of the damper 201 relative to the lower protective plate 101 can be changed, so that different initial installation distances are formed between the damper 201, the lower positioning cup 203, the main spring 204 and the positioning seat 206. When the third threaded seat 106 adjusts the position of the damper 201, the initial compression state of the main spring 204 can be changed, thereby realizing the adjustment of the preload of the main spring 204. like Figure 5 As shown in the preload adjustment ②, by rotating the third threaded seat 106, the damper 201 is moved up and down along the axial direction, thereby changing the installation height of the damper 201 and the initial compression of the main spring 204. By adjusting the preload of the main spring 204, the main spring 204 can be in a suitable initial working state after the multi-head embroidery machine is installed, so as to adapt to the static load generated by the machine body of different weights. Furthermore, the damping end of the damper 201 is provided with a fourth threaded seat 202, and the lower positioning cup 203 is connected to the fourth threaded seat 202. By rotating the fourth threaded seat 202, the damping end of the damper 201 can be moved axially, thereby changing the relative installation position between the damper 201 and the lower positioning cup 203, and further changing the relative position between the damper 201, the lower positioning cup 203, the main spring 204, the upper positioning cup 205, and the positioning seat 206.

[0056] like Figure 5As shown in height adjustment ③, by rotating the fourth threaded seat 202, the damper 201 can be moved up and down along the axis to change the overall working height of the vibration damping foot. When the multi-head embroidery machine is installed on the installation ground with height difference or unevenness, the fourth threaded seat 202 of the vibration damping foot in different positions can be adjusted to match the support height of multiple vibration damping feet, thereby reducing the uneven local support force caused by uneven installation ground. Furthermore, the lower part of the positioning seat 206 is connected to the upper positioning bowl 205, and the main spring 204 is disposed between the lower positioning bowl 203 and the upper positioning bowl 205. By adjusting the relative position between the upper positioning bowl 205 and the positioning seat 206, the initial compression of the main spring 204 can be further changed, so that the main spring 204 can be adaptively adjusted according to the load-bearing requirements of different support positions. In this alternative, the damper 201 adopts a structure with adjustable damping parameters. For example... Figure 5 As shown in Figure ④, the damper 201 is equipped with a damping adjustment structure. By rotating the adjustment component on the damper 201, the damping parameters inside the damper 201 can be changed. When the adjustment component is rotated clockwise, the damping of the damper 201 increases, enabling the damper 201 to effectively dissipate the vibration energy generated during the rapid axial movement of the positioning seat 206. When the adjustment component is rotated counterclockwise, the damping of the damper 201 decreases, allowing the positioning seat 206 to obtain a more flexible axial displacement response. Thus, the damping parameters of the damper 201 can be adjusted according to the operating speed of different heads of the multi-head embroidery machine and different operating conditions. When the operating speed of the head is high and the vibration amplitude is large, the damping of the damper 201 can be appropriately increased to improve the vibration energy dissipation capacity. When the operating speed of the head is low and the vibration amplitude is small, the damping of the damper 201 can be appropriately decreased to maintain a good flexible response capability of the vibration damping foot.

[0057] Furthermore, this alternative solution can combine the aforementioned preload adjustment of the return spring 208, preload adjustment of the main spring 204, height adjustment of the damping feet, and damping adjustment of the damper 201. Specifically, when installing a multi-head embroidery machine, the axial position of the damper 201 can first be adjusted via the fourth threaded seat 202 to allow the damping feet at different positions to obtain a suitable working height; then, the position of the protective cover 105 can be adjusted via the second threaded seat 104 to change the initial compression of the return spring 208; then, the installation position of the damper 201 can be adjusted via the third threaded seat 106 to change the initial compression state of the main spring 204; finally, the damping parameters of the damper 201 can be adjusted according to the vibration generated during the operation of the multi-head embroidery machine. For long-bodied multi-head embroidery machines, different parameter configurations can be adopted according to the differences in vibration response at different positions of the machine body. For example, the vibration damping feet near the middle of the machine body can increase the initial preload of the main spring 204 through the third threaded seat 106 and adjust the damper 201 to a larger damping state to improve the load-bearing stability of the middle position; the vibration damping feet near the ends of the machine body can appropriately reduce the preload of the return spring 208 through the second threaded seat 104 and increase the effective working height or buffer stroke through the fourth threaded seat 202 to make the end position have better vibration adaptability. During the operation of the multi-head embroidery machine, the vibration load generated by the machine head is transmitted to the positioning seat 206 through the machine body. The positioning seat 206 moves axially along the positioning sleeve 209, causing the main spring 204 and the return spring 208 to undergo corresponding elastic deformation. The main spring 204 bears the main load and provides the main elastic support, while the return spring 208 provides auxiliary elastic support and reset function. The damper 201 dissipates the vibration energy generated during the elastic deformation. By adjusting the initial preload of the main spring 204 and the return spring 208 and the damping parameter of the damper 201, the dynamic response characteristics of the vibration damping foot can be changed. This alternative solution uses the second threaded seat 104, the third threaded seat 106, and the fourth threaded seat 202 to adjust the preload of the return spring 208, the initial working state of the main spring 204, and the overall working height of the vibration damping foot, respectively. Combined with the variable damping structure of the damper 201, the vibration damping foot can be parameter-matched for different machine weights, different installation grounds, different machine head operating speeds, and vibration characteristics at different positions of the machine body, thus forming a wide-frequency vibration damping structure with adjustable preload, adjustable main spring working state, adjustable height, and variable damping. The above structure can further expand the applicable working conditions of the vibration damping feet and enable multiple vibration damping feet to be adjusted differently according to the actual vibration state of different support positions of the long-body multi-head embroidery machine. This improves the absorption, buffering and dissipation of vibrations of different frequencies and amplitudes, and reduces the propagation of vibration along the long body and the amplification of vibration at local positions.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wideband adaptive vibration damping foot for multi-head embroidery machines, characterized in that, It includes a protective component (1) and a shock-absorbing component (2) disposed inside the protective component (1); The protective component (1) includes a lower protective plate (101), a protective outer jacket (103), and a protective cover plate (105). The lower protective plate (101) is used to contact the installation ground. The protective outer jacket (103) is disposed above the lower protective plate (101), and the protective cover plate (105) is disposed above the protective outer jacket (103). The lower protective plate (101), the protective outer jacket (103), and the protective cover plate (105) together form a protective space for accommodating the shock-absorbing component (2). The shock absorption assembly (2) includes a damper (201), a lower positioning cup (203), a main spring (204), an upper positioning cup (205), a positioning seat (206), a return spring (208), and a positioning sleeve (209). The fixed end of the damper (201) is connected to the lower protective plate (101), the damping end of the damper (201) is connected to the lower positioning cup (203), the two ends of the main spring (204) abut against the lower positioning cup (203) and the upper positioning cup (205) respectively, and the upper positioning cup (205) is connected to the positioning seat (206); The positioning seat (206) is movably arranged along the bearing direction of the lower protective plate (101), the positioning sleeve (209) is sleeved on the outside of the positioning seat (206) and guides the movement direction of the positioning seat (206), and the reset spring (208) is arranged between the positioning seat (206) and the positioning sleeve (209). The stiffness of the main spring (204) is different from that of the return spring (208). The main spring (204) is used to bear the main static load and dynamic load of the multi-head embroidery machine body. The return spring (208) is used to provide auxiliary elastic restoring force after the positioning seat (206) is displaced. The damper (201) is used to dissipate the vibration energy generated when the main spring (204) and the return spring (208) undergo elastic deformation. The main spring (204), the return spring (208), and the damper (201) together form a composite vibration reduction structure with different elastic response ranges, so that the vibration reduction foot can generate different degrees of elastic deformation and damping buffer for different frequency vibrations generated by different machine heads operating at different speeds of the multi-head embroidery machine.

2. A wideband adaptive vibration damping foot for multi-head embroidery machines according to claim 1, characterized in that, The top of the lower protective plate (101) is fixedly provided with a first threaded seat (102), and the lower end of the protective outer sleeve (103) is threadedly connected to the first threaded seat (102). The top of the protective jacket (103) is fixedly provided with a second threaded seat (104), and the protective cover plate (105) is threadedly connected to the second threaded seat (104); The first threaded seat (102) and the second threaded seat (104) are respectively used to adjust the assembly position between the protective outer cover (103), the protective lower plate (101), and the protective cover (105) to form a preset installation space for the shock absorption assembly (2).

3. A wideband adaptive vibration damping foot for multi-head embroidery machines according to claim 2, characterized in that, The axial assembly position between the protective cover plate (105) and the protective outer sleeve (103) can be adjusted by the second threaded seat (104) to change the relative installation position between the positioning sleeve (209) and the positioning seat (206), thereby changing the initial compression of the return spring (208). By adjusting the initial compression of the return spring (208), the return spring (208) can have different pre-pressures when the vibration damping foot is in a vibration-free state, so as to adapt to the multi-head embroidery machine body of different weights and different installation ground support conditions.

4. A wideband adaptive vibration damping foot for multi-head embroidery machines according to claim 1, characterized in that, A third threaded seat (106) is fixedly provided on the top of the lower protective plate (101), and the fixed end of the damper (201) is threadedly connected to the third threaded seat (106). The damping end of the damper (201) is fixedly provided with a fourth threaded seat (202), and the lower positioning cup (203) is threadedly connected to the fourth threaded seat (202); By adjusting the connection position between the damper (201) and the third threaded seat (106) and the connection position between the lower positioning cup (203) and the fourth threaded seat (202), the relative installation positions between the damper (201), the main spring (204) and the positioning seat (206) are changed to adjust the initial compression state of the shock absorption assembly (2).

5. A wide-frequency adaptive vibration damping foot for a multi-head embroidery machine according to claim 4, characterized in that, The bottom of the positioning seat (206) is fixedly provided with a fifth threaded seat (207), and the upper positioning bowl (205) is threadedly connected to the fifth threaded seat (207); The two ends of the main spring (204) abut against the lower positioning cup (203) and the upper positioning cup (205) respectively. The fifth threaded seat (207) is used to adjust the relative axial position between the upper positioning cup (205) and the positioning seat (206) to change the initial compression of the main spring (204).

6. A wideband adaptive vibration damping foot for a multi-head embroidery machine according to claim 5, characterized in that, The stiffness of the main spring (204) is greater than that of the return spring (208). The main spring (204) is used to form the main load-bearing and low-frequency vibration buffering part of the vibration damping foot, and the return spring (208) is used to form the auxiliary elastic buffering and reset part. When the multi-head embroidery machine generates low-amplitude vibration, the reset spring (208) and the main spring (204) generate small-amplitude elastic deformation; when the multi-head embroidery machine generates large-amplitude vibration, the compression of the main spring (204) increases, and the vibration energy dissipation is increased through the damper (201) to form a graded vibration reduction response under different load conditions.

7. A wideband adaptive vibration damping foot for a multi-head embroidery machine according to claim 6, characterized in that, The positioning sleeve (209) is sleeved on the outside of the positioning seat (206), and the return spring (208) is located between the positioning seat (206) and the positioning sleeve (209); The positioning seat (206) can reciprocate along the axial direction under the guidance of the positioning sleeve (209), and the positioning sleeve (209) restricts the radial offset of the positioning seat (206). The main spring (204) and the return spring (208) correspond to different axial compression strokes, so that the positioning seat (206) has different axial displacement ranges under different vibration amplitudes, thereby forming a vibration reduction structure with graded compression strokes.

8. A wideband adaptive vibration damping foot for a multi-head embroidery machine according to claim 7, characterized in that, The damper (201) is a damper (201) with different damping coefficients for different feet. The damping force of the damper (201) can be adjusted according to the axial displacement speed of the positioning seat (206) so that the damper (201) can provide different vibration energy dissipation capabilities at different vibration frequencies corresponding to different operating speeds of the multi-head embroidery machine.

9. A wideband adaptive vibration damping foot for a multi-head embroidery machine according to claim 8, characterized in that, A shock-absorbing pad (107) is provided on the outer side of the lower protective plate (101), and the shock-absorbing pad (107) is located between the lower protective plate (101) and the installation ground; The elastic stiffness of the shock-absorbing pad (107) is less than that of the main spring (204), and it is used to absorb the relative vibration between the lower protective plate (101) and the installation ground, so as to reduce the transmission of vibration generated by the multi-head embroidery machine to the installation ground. The shock-absorbing pad (107), the main spring (204), the reset spring (208), and the damper (201) form a multi-stage vibration reduction path along the load transmission direction of the multi-head embroidery machine.

10. A wideband adaptive vibration damping foot for a multi-head embroidery machine according to claim 1, characterized in that, The vibration damping feet are set at different support positions at the bottom of the multi-head embroidery machine body. The vibration damping feet located at different positions along the length of the machine body have different main spring (204) stiffness, return spring (208) stiffness, main spring (204) preload, return spring (208) preload and / or damping parameters of damper (201). Among them, the vibration damping foot seat near the middle of the multi-head embroidery machine body is configured as a vibration damping component (2) with a large bearing stiffness, and the vibration damping foot seat near the end of the machine body is configured as a vibration damping component (2) with a large vibration buffer stroke, so as to form differentiated vibration damping support according to the vibration response difference of different positions of the machine body. Multiple vibration damping feet work together to absorb, buffer, and dissipate vibrations of different frequencies and amplitudes generated at different locations on the machine body in different areas, thereby reducing the vibrations propagating along the length of the machine body and the amplification of local vibrations during the operation of a long-body multi-head embroidery machine.

Images