Double-layer nested relative telescopic grinding head with elastic compensation mechanism
By setting an axially compressed elastic pad and a double nesting structure between the inner and outer grinding seats of the glass edging machine, the problem of wear of the sealing structure between the inner and outer grinding heads is solved, dynamic compensation sealing is achieved, and the stability and life of the equipment are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI CDQC ELECTRIC
- Filing Date
- 2026-03-30
- Publication Date
- 2026-06-12
AI Technical Summary
In existing glass edging machines, the sealing structure between the inner and outer grinding heads wears down due to frequent expansion, contraction, and rotation, resulting in decreased sealing performance. Glass fragments and impurities then enter the rotating shaft area, affecting the stability and lifespan of the equipment.
A first elastic pad is placed in the axial gap between the inner grinding seat and the outer grinding seat, so that it is in a compressed state and its extension range covers the entire stroke of the inner grinding seat, forming an axial sealing structure to avoid sliding friction. A circular groove and a second elastic pad are introduced to construct an inner and outer double nested elastic compensation structure.
It significantly extends the sealing life, prevents glass debris from intruding into the shaft area, improves the processing stability and service life of the edge grinding machine, and reduces long-term maintenance costs.
Smart Images
Figure CN224347638U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of glass edging equipment, and in particular to the grinding head structure of glass edging equipment. Background Technology
[0002] In glass processing, there is a step of edge grinding, which aims to grind the edges of the cut glass to remove excess material and improve assembly accuracy. To improve processing efficiency, double-headed edge grinding machines are increasingly being used in glass edge grinding.
[0003] Patent CN120791573A discloses an intelligent composite glass edging machine. This patent includes an outer grinding head and an inner grinding head arranged coaxially. The outer grinding head is connected to the end of the outer shaft, and the inner grinding head is connected to the end of the inner shaft. The inner shaft is inserted into the outer shaft and can move axially relative to the outer shaft. The inner shaft is connected to a first adjusting device through a connecting sleeve. The first adjusting device can push the inner shaft to move back and forth along its axial direction, thereby realizing the extension and retraction adjustment of the inner grinding head relative to the outer grinding head to adjust the grinding amount.
[0004] Because the inner grinding head needs to extend and retract axially relative to the outer grinding head to adjust the grinding amount, there must be a certain gap between the inner and outer grinding heads. During the glass grinding process, a large number of fine glass fragments and impurities are generated. If these fragments intrude through the gap, they will move further inward and enter the area where the shaft is located. This will not only aggravate the wear of the shaft, but may also cause the shaft to jam, reduce accuracy, or even damage the equipment, seriously affecting the processing stability and service life of the edge grinding machine.
[0005] In patent CN120791573A, to prevent a large number of fine glass fragments and impurities generated during the grinding process from intruding into the internal rotating shaft area, this prior art sets up a sealing structure between the inner grinding head and the outer grinding head. Specifically, a first sealing element is provided on the outer surface of the inner grinding seat. This first sealing element is located between the surfaces of the inner grinding seat and the outer grinding seat, and dynamic sealing is achieved through sliding contact between the first sealing element and the surface of the inner or outer grinding head.
[0006] However, in actual long-term operation, because the inner grinding head needs to rotate at high speed and frequently extend and retract axially, the first seal is always in a state of sliding friction, inevitably leading to wear. As the first seal wears, the interference fit between the first seal and the inner wall of the outer grinding head or the outer wall of the inner grinding head gradually decreases, resulting in a decline in sealing performance. When the seal fails, glass fragments and impurities can enter through the gap between the inner and outer grinding heads, and then move towards the area where the rotating shaft is located, causing wear on the rotating shaft and thus affecting the service life of the edge grinding machine. Utility Model Content
[0007] In view of the shortcomings of the existing technology, one of the purposes of this utility model is to provide a double-layer nested relative telescopic grinding head with an elastic compensation mechanism.
[0008] The double-layer nested relative telescopic grinding head with an elastic compensation mechanism provided in this application adopts the following technical solution:
[0009] A double-layer nested relative telescopic grinding head with an elastic compensation mechanism includes an outer grinding head and an inner grinding head nested coaxially, as well as an outer grinding seat for mounting the outer grinding head and an inner grinding seat for mounting the inner grinding head;
[0010] The internal grinding seat is located at the front end of an internal shaft, and the internal shaft and the internal grinding seat can move axially relative to the external grinding seat;
[0011] An axial gap exists between the rear end of the inner grinding seat and the front end of the outer grinding seat, allowing the inner grinding seat to move relative to each other. A first elastic pad in an annular shape is provided in the axial gap.
[0012] The front side of the first elastic pad abuts against the rear end of the inner grinding seat, and the rear side of the first elastic pad is fixed to the front end of the outer grinding seat.
[0013] And the first elastic pad is in a compressed state;
[0014] The extension range of the first elastic pad covers the travel range of the internal grinding seat along the axial direction.
[0015] In existing technologies, frequent extension, retraction, and rotation of the inner grinding head lead to wear and tear on the sealing structure between the inner and outer grinding heads, resulting in a gradual decline in sealing performance and allowing glass fragments and impurities to intrude through the gap between the inner and outer grinding heads, thus affecting the service life of the edge grinding machine. This application addresses this problem by placing a first elastic pad within the axial gap between the inner and outer grinding seats. This first elastic pad is compressed, and its extension range covers the entire stroke range of the inner grinding seat, thus forming an axial sealing structure with automatic compensation function. Specifically, because the first elastic pad is compressed within the axial gap, its own elastic restoring force ensures that its axial ends always remain tightly against the front end of the outer grinding seat and the rear end of the inner grinding seat. Regardless of whether the inner grinding seat is retracted or extended, the first elastic pad maintains effective contact. Furthermore, the extension range of the first elastic pad covers the entire travel of the inner grinding seat, meaning that even if the inner grinding seat extends to the farthest position from the front end of the outer grinding seat, the first elastic pad remains compressed and will not detach from any contact surface, thereby achieving dynamic compensation sealing for axial clearance.
[0016] Compared to existing radial sealing methods that rely on sliding contact, this application shifts the sealing surface from radial to axial, avoiding high-speed sliding friction between the sealing structure and the rotating surface, thus significantly reducing wear. Simultaneously, the extension range of the first elastic pad covers the entire travel of the inner grinding seat. Even if the first elastic pad experiences minor wear due to long-term use, it can still automatically fill the gaps caused by wear using its own elastic restoring force, maintaining a reliable seal. Therefore, this application not only solves the problem of rapid wear caused by sliding friction in existing seals but also significantly extends the seal life through an elastic compensation mechanism, effectively preventing glass debris from intruding into the rotating shaft area, thereby improving the processing stability and service life of the edge grinding machine and reducing its long-term maintenance costs.
[0017] Preferably, the uncompressed width of the first elastic pad is 1.2 to 2 times the maximum value of the axial gap width.
[0018] When the internal grinding seat is at its furthest grinding position relative to the external grinding seat, the axial clearance width reaches its maximum value. Since the width of the first elastic pad before compression is greater than this maximum axial clearance width, it will inevitably be compressed when inserted into the axial clearance. By setting the uncompressed width of the first elastic pad to 1.2 to 2 times the maximum axial clearance width, sufficient initial compression is ensured, providing ample reserve for subsequent wear compensation. Furthermore, excessive compression avoids excessive stress on the first elastic pad, leading to premature aging. This ensures that each product can stably achieve the elastic compensation function, further enhancing the industrial application value of this application.
[0019] Preferably, the difference between the outer diameter and the inner diameter of the first elastic pad is 3 to 8 millimeters.
[0020] By adopting the above technical solution, the first elastic pad has a suitable radial cross-sectional area. This cross-sectional area can ensure that the first elastic pad has sufficient structural strength under long-term compression and high-speed rotation conditions, and can also ensure that the first elastic pad maintains stable elastic deformation characteristics under axial compression. Thus, while ensuring the elastic compensation function, the service life and operational reliability of the first elastic pad are significantly improved.
[0021] Preferably, the first elastic pad is a polyurethane elastic pad.
[0022] Polyurethane possesses excellent wear resistance, effectively resisting material fatigue caused by long-term compression rebound and slight creep. Simultaneously, polyurethane exhibits good water resistance, resisting hydrolysis even under prolonged immersion in cooling water, ensuring dimensional stability and lasting elasticity. Furthermore, polyurethane possesses high elastic recovery capability, maintaining stable mechanical properties during frequent compression and recovery cycles. This material selection enables the first elastic pad to operate reliably for extended periods under complex conditions of high speed, high-frequency expansion and contraction, and multiple media, not only extending the service life of the first elastic pad itself but also ensuring the stability and sealing effect of the entire elastic compensation mechanism from a material perspective.
[0023] Preferably, the front end of the outer grinding seat has a circular groove coaxial with the inner shaft, the first elastic pad is disposed in the circular groove, and the front end of the first elastic pad protrudes from the circular groove and abuts against the rear end of the inner grinding seat.
[0024] The first elastic pad may experience radial displacement due to centrifugal force during high-speed rotation. By employing the aforementioned technical solution, the circular groove provides precise radial positioning for the first elastic pad. The sidewalls of the circular groove effectively constrain the radial movement of the elastic pad during high-speed rotation, preventing it from deviating from its working position due to centrifugal force and thus avoiding accidental wear or elastic compensation failure. Furthermore, the circular groove provides a pre-positioning function for assembly, simplifying the assembly process. This technical solution, through a simple circular groove, solves the key problems of radial positioning and protection of the first elastic pad at extremely low cost, further improving the durability of the elastic compensation mechanism.
[0025] Preferably, a cylindrical base in the shape of a cylinder is coaxially fixed at the front end of the inner shaft, and the inner grinding seat is fixedly disposed at the front end of the cylindrical base. The inner grinding seat and the cylindrical base move synchronously with the inner shaft.
[0026] The diameter of the cylindrical base is larger than the diameter of the inner shaft, but smaller than the inner diameter of the annular first elastic pad.
[0027] The cylindrical base is coaxially provided with a second annular elastic pad at its rear end, and the outer diameter of the second elastic pad is smaller than the inner diameter of the first elastic pad.
[0028] The front side of the second elastic pad abuts against the rear end of the cylindrical base, and the rear side of the second elastic pad is fixed to the front end of the outer grinding seat;
[0029] And the second elastic pad is in a compressed state;
[0030] The extension range of the second elastic pad covers the range of travel of the cylindrical base along its axial direction.
[0031] By adopting the above technical solution, a cylindrical base and a second elastic pad are introduced, which, together with the first elastic pad, construct an inner and outer double-nested elastic compensation structure. This inner and outer double-nested elastic compensation structure forms a parallel sealing design, with both elastic pads performing active elastic sealing compensation. Even if one elastic pad fails due to extreme working conditions, the other elastic pad can still maintain the sealing function, significantly improving the reliability and fault tolerance of the seal. Furthermore, the two elastic pads share the axial pressure, reducing the load on a single elastic pad, lowering the stress level, and further extending their respective service lives.
[0032] Furthermore, the first and second elastic pads form two layers of sealing barriers in space, requiring glass fragments to pass through both seals sequentially before penetrating the interior. This significantly enhances the dust and water resistance, creating a labyrinth seal effect. Based on a single elastic pad, this technical solution further improves sealing performance through simple structural stacking, thereby greatly enhancing seal stability and preventing shaft wear caused by glass fragments and impurities.
[0033] Preferably, the first elastic pad, which is in the shape of an annulus, is disposed on the outer periphery of the cylindrical base and the second elastic pad, and the radial gap between the inner diameter of the first elastic pad and the outer diameter of the second elastic pad is 2 to 5 mm.
[0034] When the two elastic pads are axially compressed, they both expand radially. The first elastic pad expands inward, while the second elastic pad expands outward. By employing the above-mentioned technical solution, a gap of 2 to 5 mm is sufficient to accommodate the radial deformation of the first and second elastic pads under maximum compression, avoiding significant contact friction and allowing the second elastic pad to fully utilize its elastic deformation. Simultaneously, under high-speed rotation, the elastic pads undergo radial outward deformation under centrifugal force, increasing the inner diameter of the first elastic pad and the outer diameter of the second elastic pad. The effects of these two changes partially offset each other on the gap, ensuring that the 2 to 5 mm gap still maintains minimal wear between the first and second elastic pads, thereby reducing long-term maintenance costs.
[0035] Preferably, the second elastic pad is a polyurethane elastic pad.
[0036] By adopting the above technical solution, the excellent wear resistance, water resistance and elastic recovery ability of polyurethane material enable the second elastic pad to work reliably for a long time under high-frequency expansion and contraction conditions, and the stability and sealing effect of the entire elastic compensation mechanism are guaranteed through the material level.
[0037] In summary, this application includes at least one of the following beneficial technical effects:
[0038] 1. This invention addresses the problem in existing technologies where frequent extension, retraction, and rotation of the inner grinding head lead to wear and tear on the sealing structure between the inner and outer grinding heads, resulting in a gradual decline in sealing performance and allowing glass fragments and impurities to intrude through the gap between the inner and outer grinding heads, thus affecting the service life of the edge grinding machine. This application addresses this issue by placing a first elastic pad within the axial gap between the inner and outer grinding seats. This first elastic pad is compressed, and its extension range covers the entire stroke range of the inner grinding seat, thus forming an axial sealing structure with automatic compensation function. Specifically, because the first elastic pad is compressed within the axial gap, its own elastic restoring force ensures that both ends of the first elastic pad remain firmly against the front end of the outer grinding seat and the rear end of the inner grinding seat, maintaining effective contact regardless of whether the inner grinding seat is retracted or extended. Furthermore, the extension range of the first elastic pad covers the entire travel of the inner grinding seat, meaning that even if the inner grinding seat extends to the farthest position from the front end of the outer grinding seat, the first elastic pad remains compressed and will not separate from any contact surface, thereby achieving dynamic compensation sealing for axial clearance.
[0039] 2. Compared with the radial sealing method that relies on sliding contact in the prior art, this application shifts the sealing surface from radial to axial, avoiding high-speed sliding friction between the sealing structure and the rotating surface, and significantly reducing wear. Simultaneously, the extension range of the first elastic pad covers the entire travel of the inner grinding seat. Even if the first elastic pad experiences minor wear due to long-term use, it can still automatically fill the gap caused by wear through its own elastic recovery force, continuously maintaining a reliable sealing state. Therefore, this application not only solves the problem of rapid wear caused by sliding friction in existing seals, but also significantly extends the sealing life through an elastic compensation mechanism, effectively preventing glass debris from intruding into the rotating shaft area, thereby improving the processing stability and service life of the edge grinding machine and reducing the long-term maintenance cost of the edge grinding machine.
[0040] 3. When the inner grinding seat is at its furthest grinding position relative to the outer grinding seat, the axial clearance width reaches its maximum value. Since the width of the first elastic pad before compression is greater than this maximum axial clearance width, it will inevitably be compressed when inserted into the axial clearance. By setting the uncompressed width of the first elastic pad to 1.2 to 2 times the maximum axial clearance width, sufficient initial compression is ensured, providing ample reserve for subsequent wear compensation. Furthermore, excessive compression avoids excessive stress on the first elastic pad, leading to premature aging. This ensures that each product can stably achieve the elastic compensation function, further enhancing the industrial application value of this application. Attached Figure Description
[0041] Figure 1This embodiment of the application is a schematic diagram illustrating the structure of a double-layered nested relatively telescopic grinding head with an elastic compensation mechanism;
[0042] Figure 2 for Figure 1 The cross-sectional view along AA shows the internal structure of the double-nested relative telescopic grinding head with an elastic compensation mechanism;
[0043] Figure 3 yes Figure 2 The enlarged view in section B shows the axial clearance, the circular groove, and the positional relationship between the first and second elastic pads.
[0044] Reference numerals: 1. Outer grinding head; 2. Inner grinding head; 3. Outer grinding seat; 4. Inner grinding seat; 5. Inner shaft; 6. Axial clearance; 7. First elastic pad; 8. Circular groove; 9. Cylindrical base; 10. Second elastic pad. Detailed Implementation
[0045] The following is in conjunction with the appendix Figure 1 -Appendix Figure 3 This application will be described in further detail.
[0046] This application discloses a double-nested relative telescopic grinding head with an elastic compensation mechanism.
[0047] Reference Figure 1 , Figure 2 and Figure 3 A double-layer nested relative telescopic grinding head with an elastic compensation mechanism includes an outer grinding head 1 and an inner grinding head 2 nested coaxially, as well as an outer grinding seat 3 for mounting the outer grinding head 1 and an inner grinding seat 4 for mounting the inner grinding head 2.
[0048] The inner grinding seat 4 is located at the front end of an inner shaft 5, and the inner shaft 5 and the inner grinding seat 4 can move axially relative to the outer grinding seat 3.
[0049] There is an axial gap 6 between the rear end of the inner grinding seat 4 and the front end of the outer grinding seat 3, which allows the inner grinding seat 4 to move relative to each other. A first elastic pad 7 in an annular shape is provided in the axial gap 6.
[0050] The front side of the first elastic pad 7 abuts against the rear end of the inner grinding seat 4, and the rear side of the first elastic pad 7 is fixed to the front end of the outer grinding seat 3.
[0051] And the first elastic pad 7 is in a compressed state;
[0052] The extension range of the first elastic pad 7 covers the travel range of the inner grinding seat 4 along the axial direction.
[0053] The grinding direction of the outer grinding head 1 and the inner grinding head 2 is considered forward. The front end of the inner shaft 5 is fixedly connected to the inner grinding seat 4. The inner shaft 5 is connected to an outer shaft via a key connection. The outer shaft is fixedly connected to the outer grinding seat 3, enabling the coaxial rotation of the inner grinding seat 4 and the outer grinding seat 3. The outer grinding head 1 has a ring structure and is fixedly installed on the front end face of the outer grinding seat 3. The inner grinding head 2 is fixedly installed on the front end face of the inner grinding seat 4. The rear end of the inner grinding seat 4 has a ring-shaped plane, which is the contact surface that abuts against the front end of the first elastic pad 7. The front end face of the outer grinding seat 3 also has a ring-shaped plane, which is located inside the outer grinding head 1. The rear end of the first elastic pad 7 is bonded and fixed to the ring-shaped plane at the front end of the outer grinding seat 3.
[0054] The rear end of the inner shaft 5 is connected to a drive system, which drives the inner shaft 5 and the inner grinding seat 4 fixed at its front end to move and rotate axially. A certain spatial distance is maintained between the rear end face of the inner grinding seat 4 and the front end face of the outer grinding seat 3. This spatial distance is the axial clearance 6 that allows the inner grinding seat 4 to move relative to the outer grinding seat 3. The width of the axial clearance 6 changes with the axial position of the inner grinding seat 4, thereby realizing the extension and retraction adjustment of the inner grinding head 2 relative to the outer grinding head 1 to adjust the grinding amount. When the inner grinding seat 4 retracts backward, the axial clearance 6 decreases; when the inner grinding seat 4 extends forward, the axial clearance 6 increases.
[0055] In existing technologies, frequent extension, retraction, and rotation of the inner grinding head 2 lead to wear and tear on the sealing structure between the inner grinding head 2 and the outer grinding head 1, resulting in a gradual decline in sealing performance and allowing glass fragments and impurities to enter through the gap between the inner and outer grinding heads 2, thus affecting the service life of the edge grinding machine. This application addresses this problem by placing a first elastic pad 7 within the axial gap 6 between the inner grinding seat 4 and the outer grinding seat 3. This first elastic pad 7 is compressed, and its extension range covers the entire stroke range of the inner grinding seat 4, thus forming an axial sealing structure with automatic compensation function. Specifically, because the first elastic pad 7 is compressed within the axial gap 6, its own elastic restoring force ensures that both ends of the first elastic pad 7 remain tightly against the front end of the outer grinding seat 3 and the rear end of the inner grinding seat 4. Regardless of whether the inner grinding seat 4 is retracted or extended, the first elastic pad 7 maintains effective contact. Furthermore, the extension range of the first elastic pad 7 covers the entire travel of the inner grinding seat 4, meaning that even if the inner grinding seat 4 extends to the farthest position from the front end of the outer grinding seat 3, the first elastic pad 7 remains in a compressed state and will not detach from any contact surface, thereby achieving dynamic compensation sealing for the axial clearance 6.
[0056] Compared to existing radial sealing methods that rely on sliding contact, this application shifts the sealing surface from radial to axial, avoiding high-speed sliding friction between the sealing structure and the rotating surface, thus significantly reducing wear. Simultaneously, the extension range of the first elastic pad 7 covers the entire travel of the inner grinding seat 4. Even if the first elastic pad 7 experiences minor wear due to long-term use, it can still automatically fill the gaps caused by wear using its own elastic restoring force, continuously maintaining a reliable sealing state. Therefore, this application not only solves the problem of rapid wear caused by sliding friction in existing seals but also significantly extends the seal life through an elastic compensation mechanism, effectively preventing glass debris from intruding into the rotating shaft area, thereby improving the processing stability and service life of the edge grinding machine and reducing its long-term maintenance costs.
[0057] The uncompressed width of the first elastic pad 7 is 1.2 to 2 times the maximum width of the axial clearance 6. When the inner grinding seat 4 is in the grinding position furthest from the outer grinding seat 3, the width of the axial clearance 6 reaches its maximum value. Since the uncompressed width of the first elastic pad 7 is greater than this maximum width, it will inevitably be compressed when inserted into the axial clearance 6. For example, when the multiple is 1.5, the uncompressed width of the first elastic pad 7 is 50% of the maximum width of the axial clearance 6. By setting the uncompressed width of the first elastic pad 7 to 1.2 to 2 times the maximum width of the axial clearance 6, sufficient initial compression is ensured, providing ample reserve for subsequent wear compensation. Excessive compression also prevents the first elastic pad 7 from experiencing excessive stress and premature aging, thus ensuring that each product can stably achieve the elastic compensation function and further enhancing the industrial application value of this application.
[0058] The difference between the outer diameter and the inner diameter of the first elastic pad 7 is 3 to 8 mm. This gives the first elastic pad 7 a suitable radial cross-sectional area, which ensures that the first elastic pad 7 has sufficient structural strength under long-term compression and high-speed rotation conditions, and also ensures that the first elastic pad 7 maintains stable elastic deformation characteristics under axial compression. Thus, while ensuring the elastic compensation function, the service life and operational reliability of the first elastic pad 7 are significantly improved.
[0059] The first elastic pad 7 is made of polyurethane. Polyurethane has excellent wear resistance, effectively resisting material fatigue caused by long-term compression rebound and slight creep. Simultaneously, polyurethane has good water resistance, resisting hydrolysis even under long-term immersion in cooling water, ensuring dimensional stability and lasting elasticity. Furthermore, polyurethane possesses high elastic recovery capability, maintaining stable mechanical properties during frequent compression and recovery cycles. This material selection enables the first elastic pad 7 to operate reliably for extended periods under complex conditions of high speed, high-frequency expansion and contraction, and multiple media, not only extending the service life of the first elastic pad 7 itself but also ensuring the stability and sealing effect of the entire elastic compensation mechanism from a material perspective.
[0060] The front end of the outer grinding seat 3 is provided with a circular groove 8 coaxial with the inner shaft 5. The first elastic pad 7 is disposed in the circular groove 8, and the front end of the first elastic pad 7 protrudes out of the circular groove 8 and abuts against the rear end of the inner grinding seat 4.
[0061] The diameter of the circular groove 8 is larger than the diameter of the inner shaft 5 and larger than the outer diameter of the first elastic pad 7. The first elastic pad 7 is disposed in the circular groove 8, and a small gap is left between the outer peripheral surface of the first elastic pad 7 and the side wall of the groove.
[0062] The first elastic pad 7 may experience radial displacement due to centrifugal force during high-speed rotation. By employing the aforementioned technical solution, the circular groove 8 provides precise radial positioning for the first elastic pad 7. The sidewall of the circular groove 8 effectively constrains the radial movement of the elastic pad during high-speed rotation, preventing the first elastic pad 7 from deviating from its working position due to centrifugal force, thus avoiding accidental wear or elastic compensation failure. Furthermore, the circular groove 8 also provides a pre-positioning function for assembly, simplifying the assembly process. This technical solution, through the simple circular groove 8, solves the key problems of radial positioning and protection of the first elastic pad 7 at extremely low cost, further improving the durability of the elastic compensation mechanism.
[0063] A cylindrical base 9 in the shape of a cylinder is coaxially fixed at the front end of the inner shaft 5. The inner grinding seat 4 is fixedly installed at the front end of the cylindrical base 9. The inner grinding seat 4 and the cylindrical base 9 move synchronously with the inner shaft 5.
[0064] In this embodiment, the cylindrical base 9 and the inner shaft 5 are integrally formed;
[0065] The diameter of the cylindrical base 9 is larger than the diameter of the inner shaft 5, but smaller than the inner diameter of the annular first elastic pad 7.
[0066] A second elastic pad 10 in an annular shape is coaxially provided at the rear end of the cylindrical base 9. The outer diameter of the second elastic pad 10 is smaller than the inner diameter of the first elastic pad 7.
[0067] The front side of the second elastic pad 10 abuts against the rear end of the cylindrical base 9, and the rear side of the second elastic pad 10 is fixed to the front end of the outer grinding seat 3.
[0068] And the second elastic pad 10 is in a compressed state;
[0069] The extension range of the second elastic pad 10 covers the travel range of the cylindrical base 9 along the axial direction.
[0070] By introducing a cylindrical base 9 fixedly connected to the inner shaft 5, and a second elastic pad 10, a double-nested elastic compensation structure is constructed in conjunction with the first elastic pad 7. This double-nested elastic compensation structure forms a parallel sealing design, with both elastic pads performing active elastic sealing compensation. Even if one elastic pad fails due to extreme working conditions, the other elastic pad can still maintain its sealing function, significantly improving the reliability and fault tolerance of the seal. Furthermore, the two elastic pads share the axial pressure, reducing the load on a single elastic pad and lowering the stress level, further extending their respective service lives.
[0071] Furthermore, the first elastic pad 7 and the second elastic pad 10 form two layers of sealing barriers in space, requiring glass fragments to pass through both seals sequentially before penetrating the interior. This significantly enhances the dustproof and waterproof effect, creating a labyrinth seal effect. Based on a single elastic pad seal, this technical solution further improves sealing performance through simple structural stacking, thereby greatly enhancing seal stability and avoiding shaft wear caused by glass fragments and impurities.
[0072] A first elastic pad 7 in the shape of an annulus is disposed on the outer periphery of the cylindrical base 9 and the second elastic pad 10, and the radial gap between the inner diameter of the first elastic pad 7 and the outer diameter of the second elastic pad 10 is 2~5 mm.
[0073] When both elastic pads are axially compressed, they both expand radially. The first elastic pad 7 expands inward, while the second elastic pad 10 expands outward. By designing the inner diameter of the first elastic pad 7 and the outer diameter of the second elastic pad 10, the radial gap between them is made to be 2 to 5 millimeters. This gap is sufficient to accommodate the radial deformation of the first elastic pad 7 and the second elastic pad 10 under maximum compression, avoiding significant contact friction and allowing the second elastic pad 10 to fully utilize its elastic deformation. Simultaneously, under high-speed rotation, the elastic pads deform radially outward under centrifugal force, increasing the inner diameter of the first elastic pad 7 and the outer diameter of the second elastic pad 10. The effects of these two changes on the gap are partially offset, and the 2 to 5 millimeter gap still ensures minimal wear between the first elastic pad 7 and the second elastic pad 10, thereby reducing long-term maintenance costs.
[0074] The second elastic pad 10 is a polyurethane elastic pad.
[0075] The excellent wear resistance, water resistance and elastic recovery of polyurethane material enable the second elastic pad 10 to work reliably for a long time under high-frequency expansion and contraction conditions, and the stability and sealing effect of the entire elastic compensation mechanism are guaranteed through the material level.
[0076] Furthermore, the second elastic pad 10 is made of polyurethane elastic pad, which is consistent with the first elastic pad 7, so that the inner and outer elastic pads have consistent performance and life cycle.
[0077] In actual operation, the drive system drives the inner shaft 5, the cylindrical base 9 fixed on the inner shaft 5, the inner grinding seat 4, and the inner grinding head 2 to move axially. Simultaneously, the drive system also drives the outer grinding seat 3 and the outer grinding head 1 to rotate via the outer shaft. When the inner grinding seat 4 retracts, the axial clearance 6 decreases, and the first elastic pad 7 is further compressed. When the inner grinding seat 4 extends forward, the axial clearance 6 increases, and the compression of the first elastic pad 7 decreases but remains compressed. Simultaneously, the cylindrical base 9 moves with the inner shaft 5, causing the second elastic pad 10 to compress or release synchronously. The two elastic pads always maintain close contact with their respective contact surfaces, effectively preventing the intrusion of glass fragments.
[0078] 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 double-layer nested relative telescopic grinding head with an elastic compensation mechanism, comprising an outer grinding head (1) and an inner grinding head (2) nested coaxially, and an outer grinding seat (3) for mounting the outer grinding head (1) and an inner grinding seat (4) for mounting the inner grinding head (2); The internal grinding seat (4) is located at the front end of an internal shaft (5), and the internal shaft (5) and the internal grinding seat (4) can move axially relative to the external grinding seat (3); An axial clearance (6) exists between the rear end of the internal grinding seat (4) and the front end of the external grinding seat (3), allowing the internal grinding seat (4) to move relative to each other. The characteristic of this design is that... A first elastic pad (7) in the shape of an annular structure is provided in the axial gap (6); The front side of the first elastic pad (7) abuts against the rear end of the inner grinding seat (4), and the rear side of the first elastic pad (7) is fixed to the front end of the outer grinding seat (3). And the first elastic pad (7) is in a compressed state; The extension range of the first elastic pad (7) covers the travel range of the inner grinding seat (4) along the axial direction.
2. The double-layer nested relative telescopic grinding head with an elastic compensation mechanism according to claim 1, characterized in that, The uncompressed width of the first elastic pad (7) is 1.2 to 2 times the maximum value of the width of the axial gap (6).
3. The double-layer nested relative telescopic grinding head with an elastic compensation mechanism according to claim 1, characterized in that, The difference between the outer diameter and the inner diameter of the first elastic pad (7) is 3 to 8 mm.
4. The double-layer nested relative telescopic grinding head with an elastic compensation mechanism according to claim 1, characterized in that, The first elastic pad (7) is a polyurethane elastic pad.
5. The double-layer nested relative telescopic grinding head with an elastic compensation mechanism according to claim 1, characterized in that, The front end of the external grinding seat (3) is provided with a circular groove (8) coaxial with the inner shaft (5). The first elastic pad (7) is disposed in the circular groove (8), and the front end of the first elastic pad (7) protrudes from the circular groove (8) and abuts against the rear end of the internal grinding seat (4).
6. The double-layer nested relative telescopic grinding head with an elastic compensation mechanism according to claim 1, characterized in that, A cylindrical base (9) in the shape of a cylinder is fixedly provided coaxially at the front end of the inner shaft (5), and the inner grinding seat (4) is fixedly provided at the front end of the cylindrical base (9). The inner grinding seat (4) and the cylindrical base (9) move synchronously with the inner shaft (5). The diameter of the cylindrical base (9) is greater than the diameter of the inner shaft (5) and smaller than the inner diameter of the annular first elastic pad (7); The cylindrical base (9) is coaxially provided with a second elastic pad (10) in the shape of an annulus at its rear end. The outer diameter of the second elastic pad (10) is smaller than the inner diameter of the first elastic pad (7). The front side of the second elastic pad (10) abuts against the rear end of the cylindrical base (9), and the rear side of the second elastic pad (10) is fixed to the front end of the outer grinding seat (3). And the second elastic pad (10) is in a compressed state; The extension range of the second elastic pad (10) covers the range of travel of the cylindrical base (9) along the axial direction.
7. The double-layer nested relative telescopic grinding head with an elastic compensation mechanism according to claim 6, characterized in that, The first elastic pad (7) in the shape of an annulus is disposed on the outer periphery of the cylindrical base (9) and the second elastic pad (10), and the radial gap between the inner diameter of the first elastic pad (7) and the outer diameter of the second elastic pad (10) is 2 to 5 mm.
8. The double-layer nested relative telescopic grinding head with an elastic compensation mechanism according to claim 6, characterized in that, The second elastic pad (10) is a polyurethane elastic pad.