Magnetic buffer and roller cage shoe

Abstract

The utility model discloses a magnetic buffer and a roller cage shoe, and the magnetic buffer applied to the roller cage shoe comprises a cylinder body which is provided with a cylinder barrel and a cylinder seat, one end of the cylinder seat is sealed with the cylinder barrel, and the other end of the cylinder barrel is provided with an internal thread; the cylinder cover is a disc-shaped cylinder cover with an external thread and a central via hole, and the cylinder cover is in sealing connection with the other end of the cylinder barrel by means of matching of the external thread and the internal thread; the piston rod is inserted into the cylinder body through the central via hole and is guided into the central via hole; the inner annular magnet is fixedly sleeved on an inner shaft section, inserted into the cylinder body, of the piston rod; and the outer annular magnet is fixedly mounted in the cylinder body, so that the inner annular magnet is nested in the outer annular magnet, and the axis of the outer annular magnet and the axis of the inner annular magnet are collinear. According to the magnetic buffer provided by the utility model, the reliability is relatively good under the condition that relatively good buffer performance is ensured.

Description

Technical Field

[0001] The utility model relates to a magnetic buffer used for a roller tank ear and also relates to a roller tank ear equipped with the magnetic buffer. Background Art

[0002] The roller can ear usually includes a base, a rocker arm, a roller and a buffer, wherein the base is also called a lower bracket, and the main body of the lower bracket is generally a plate structure. Two pin seats are generally provided on one plate surface of the base. Since the side where the roller is located is generally called the front side, that is, the side where the roller can ear cooperates with the can channel, the side where the buffer is located is correspondingly called the rear side, so that the force of the roller pressing on the can channel is provided based on the support from the rear side by the buffer, and buffering is generated based on its elasticity, which is similar to the shock absorption system of a vehicle. Based on this orientation, the two pin seats mentioned above can be divided into a front pin seat and a rear pin seat.

[0003] Among them, the rocker arm is also called the upper bracket. Its structure adopts an L-shaped structure in most applications. In fewer applications, the rocker arm is a vertical rod structure. The main reason for adopting the L-shaped structure is that the initial angle between the buffer and the base is close to 90°. If a vertical rod structure is adopted, the buffer needs to be tilted forward and hinged to the rear side of the upper end of the rocker arm.

[0004] Furthermore, one end of the rocker arm is hinged to the front pin seat through the third pin assembly, and the lower end of the buffer is hinged to the rear pin seat through the first pin assembly, and the upper end of the aforementioned buffer is hinged to the upper end of the rocker arm through the second pin assembly, thereby forming a hinged four-bar linkage. Anyone with a little common sense can understand that, for example, the vehicle shock absorber works in real time during the operation of the vehicle. Similarly, in the field of roller can ear technology, the buffer also works in real time during the operation of the roller can ear, thereby buffering the vibration of the roller during operation.

[0005] The components used by traditional buffers to produce elastic functions are disc spring groups, which are prone to fatigue fracture during frequent buffering actions, and gradually make the buffer ineffective. In view of this, Chinese patent document CN108861951A discloses a magnetic suspension type roller can ear, and the magnetic suspension is achieved by the buffer of this type of roller can ear. In this patent document, the buffer is composed of an oil cylinder structure, which must include a cylinder body and an end cover, as well as a piston head matched with the cylinder body and a piston rod installed on the piston head, wherein a preload spring is provided between the piston head and the end cover. Furthermore, a first electromagnet group is also provided in the oil cylinder, and the first electromagnet group includes a first disc spring and a first electromagnet, and the first disc spring is between the first electromagnet and the piston head, that is, the first electromagnet is connected to the piston head through the first disc spring. A second electromagnet group is also provided in the oil cylinder, and the second electromagnet group includes a second disc spring and a second electromagnet. Correspondingly, the second electromagnet is connected to the lower end cover or the cylinder seat of the oil cylinder through the second disc spring, so that the relative magnetic poles of the two electromagnets have the same polarity, and mutual repulsion will occur when the two are close to each other.

[0006] Based on the above description, it can be known that in the Chinese patent document CN108861951A, both disc springs and non-contact electromagnets are included. The existence of disc springs will inevitably produce mechanical contact, and the problem of disc springs being prone to failure has not been solved. While the use of electromagnets to generate magnetism can certainly adjust the magnetic flux according to needs, such as the current, but it should be known that since the electromagnets in this patent document also need to produce reciprocating motion based on buffering, the routing of the electromagnets will be greatly affected. Once the power is cut off due to wear, it will cause a direct collision between the two electromagnets, which is easy to damage the electromagnets and there is a risk of electric shock. This patent document adopts a composite buffering method, the overall structure is relatively complex, and the axial length of the buffer is not easy to control. Utility Model Content

[0007] The utility model aims to provide a magnetic buffer with relatively good reliability under the condition of ensuring relatively good buffering performance. The utility model also provides a roller tank ear equipped with the magnetic buffer.

[0008] According to a first aspect of an embodiment of the present utility model, a magnetic buffer is provided, the basic structure of which comprises:

[0009] The cylinder body comprises a cylinder barrel and a cylinder seat sealing the cylinder barrel at one end, and the other end of the cylinder barrel has an internal thread;

[0010] The cylinder cover is a disc-shaped cylinder cover having an external thread and a central through hole, and the cylinder cover is sealed to the other end of the cylinder barrel by means of the cooperation between the external thread and the internal thread;

[0011] The piston rod is inserted into the cylinder body through the central through hole and guided in the central through hole;

[0012] The inner annular magnet is fixedly mounted on the inner shaft section where the piston rod is inserted into the cylinder body;

[0013] The outer annular magnet is fixedly mounted in the cylinder body, and the inner annular magnet is nested in the outer annular magnet, and the axis of the outer annular magnet is colinear with the axis of the inner annular magnet.

[0014] Optionally, the outer annular magnet is located in the middle of the cylinder in the axial direction;

[0015] A corresponding annular bottom plate is provided to support the outer annular magnet to a predetermined height;

[0016] The inner diameter of the lower pad is greater than or equal to the outer diameter of the inner annular magnet.

[0017] Optionally, a lower positioning plate is further provided in the cylinder body between the lower pad and the cylinder seat;

[0018] A guide hole is provided in the center of the lower positioning plate;

[0019] Correspondingly, the end of the inner shaft section has a rod portion guided in the guide hole.

[0020] Optionally, a wear-resistant sleeve is inlaid in the guide hole.

[0021] Optionally, the piston rod is an assembly and includes a plurality of parts connected to each other; the piston rod correspondingly includes:

[0022] The piston rod body is guided in the central through hole;

[0023] The connecting rod is connected to one end of the piston rod body located at the cylinder barrel, and the connecting rod has the inner shaft section.

[0024] Optionally, the piston rod body is an internally threaded sleeve;

[0025] The connecting rod is a stepped shaft body, and the shaft section connected to the piston rod is a threaded shaft section, which is threadedly connected to the internal thread of the piston rod body.

[0026] Optionally, the shaft shoulder provided by the threaded shaft section is used to position one end of the inner annular magnet; a positioning retaining ring or a round nut is also provided to position and lock the other end of the inner annular magnet.

[0027] Optionally, the piston rod further comprises an adjusting rod sleeved on the piston rod body and threadedly connected to the piston rod body, for adjusting the length of the piston rod;

[0028] Correspondingly, the adjusting rod has a sleeve located outside the cylinder, and a locking hole for locking the adjusting rod is opened on the side of the piston rod body;

[0029] A rotation-stop screw matched with the locking hole is provided to lock the adjusting rod.

[0030] Optionally, an annular upper pad is provided between the other end of the outer annular magnet and the cylinder cover, and the inner diameter of the upper pad is greater than or equal to the outer diameter of the inner annular magnet.

[0031] According to a second aspect of an embodiment of the utility model, a roller can ear is provided, comprising the magnetic buffer described in the first aspect of an embodiment of the utility model.

[0032] According to the magnetic buffer of the embodiment of the utility model, on the one hand, buffering is generated based on the change of magnetic flux generated by the axial movement of the inner ring magnet between the inner ring magnet and the outer ring magnet, and fatigue damage of the disc spring group, for example, will not occur, and it has better reliability. On the other hand, the assembly method of the inner ring magnet and the outer ring magnet is relatively simple compared with the traditional cylindrical spring or disc spring group. In addition, the magnets used can be permanent magnets. The magnetism of current permanent magnets can fully meet the buffering needs of the buffer, especially the emergence of strong magnets such as neodymium iron boron magnets, whose magnetism is more than one hundred times higher than that of traditional magnetic steel, and can have extremely strong magnetism under the condition of smaller volume, so that the magnetic force generated by the adaptation of the inner and outer ring magnets can fully meet the performance requirements of buffering. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the main cross-sectional structure of a magnetic buffer in one embodiment.

[0034] Figure 2 Schematic diagram of the left-side cross-section structure of a magnetic buffer in one embodiment.

[0035] In the figure: 1. lower sleeve, 2. lower bushing, 3. lower sleeve hole, 4. cylinder seat, 5. lower positioning plate, 6. lower pad, 7. outer ring magnet, 8. inner ring magnet, 9. cylinder head, 10. connecting rod, 11. piston rod body, 12. adjusting rod, 13. upper sleeve, 14. upper bushing, 15. upper sleeve hole, 16. anti-rotation screw, 17. anti-rotation groove, 18. outer skeleton rubber dustproof oil seal, 19. Y-type oil seal for sealing groove, 20. set screw, 21. upper gasket, 22. cylinder barrel, 23. positioning retaining ring, 24. lower positioning guide sleeve, 25. upper sealing ring, 26. lower sealing ring. DETAILED DESCRIPTION

[0036] For the convenience of description, the seat end of the magnetic buffer is called the lower end. It should be known that in the mechanical field, no matter how the component is installed, its seat end can generally be regarded as the lower end, regardless of whether the seat end is located at the lower side in the spatial sense in the installed state.

[0037] Since the piston rod of the buffer used in the roller tank ear is usually a rotating body, it has definite axial, circumferential and radial directions.

[0038] Regarding the selection of magnets, permanent magnets should be used in the embodiments of the present invention. Neodymium iron boron magnets, which are currently known as strong magnets (currently in the ranks of superior magnetic magnets), can be selected. Alnico magnets with slightly inferior magnetic properties (currently in the ranks of medium magnetic magnets) or ferrite magnets (currently in the ranks of lower-medium magnetic magnets) can also be used. Due to the wide variety of magnets, the selected magnets should have magnetic properties not lower than ferrite magnets in terms of magnetic properties alone.

[0039] In view of the fact that, except for the change in the buffering form, the rest of the magnetic buffer can completely adopt the structure or construction of the existing roller tank ear buffer, this will not be described in detail in the embodiments of the present utility model. For example, the lower sleeve 1 equipped with the cylinder seat 4 and the upper sleeve 13 at the outer end of the adjusting rod 12 are the inherent structures of the current roller tank ear buffer, and therefore will not be described in detail below. Figure 1 and Figure 2 The structure shown in the example has been relatively fully demonstrated.

[0040] The basic principle of the magnetic buffer is the same as that of other types of roller tank ear buffers, which include a cylinder body and a component for providing buffering contained in the cylinder body. The main function of the cylinder body is to construct a cavity structure, thereby protecting the component for providing buffering and forming a matrix.

[0041] The cylinder body usually has a cylinder barrel 22, which is generally a cylinder. Figure 1 and Figure 2 The lower end of the illustrated cylinder 22 is sealed by the cylinder base 4, and the two are currently generally connected by welding structure.

[0042] The cylinder base 4 has Figure 1 and 2 As shown in the figure, since the cylinder seat 4 is generally made of stainless steel, the lower sleeve 1 often needs to be inlaid with a copper sleeve to form a Figure 1 The lower bushing 2 shown in the figure is used to improve the wear resistance. The same is true for the upper sleeve 13.

[0043] The cylinder base 4 seals the lower end of the cylinder barrel 22 , so that the cylinder body as a whole presents a barrel structure with a bottom, wherein the bottom is provided by the cylinder base 4 .

[0044] Furthermore, the upper end of the cylinder 22 is generally sealed with a cylinder cover 9, and a detachable connection structure is generally used for assembly between the cylinder cover 9 and the cylinder 22. Generally, the upper end of the cylinder 22 has an internal thread, and the cylinder cover 9 has an external thread, and the two can be directly threadedly connected.

[0045] In some implementations, the cylinder barrel 22 and the cylinder head 9 can be directly assembled by flange connection.

[0046] The cylinder head 9 has a central through hole, the axis of which should be colinear with the axis of the cylinder body under ideal conditions, and the cylinder head 9 is a disc-shaped cylinder head with an external thread and a central through hole, wherein the central through hole is an intervention hole for the piston rod, and the piston rod can also be understood as a transmission rod, which transmits the impact to the cylinder body, and is buffered by the buffering component in the cylinder body.

[0047] The center through hole is used as an intervention hole for the piston rod and also as a guide hole for the piston rod to make the movement of the piston rod relatively smooth.

[0048] As mentioned above, the inner cavity of the cylinder body is mainly used to accommodate and protect the components that provide buffering, so there should be a relatively good dynamic seal between the piston rod and the center through hole.

[0049] exist Figure 1 and Figure 2 In the illustrated structure, the piston rod body 11, which is the main component of the piston rod, and the center space are provided with two seals. First, the outer end of the cylinder head 9 has a countersunk hole, and the inner hole of the cylinder head 9 also has an annular groove, wherein an outer skeleton rubber dustproof oil seal 18 is provided in the countersunk hole, and a Y-type oil seal 19 for sealing the groove is provided in the groove, so as to achieve relatively reliable dynamic sealing.

[0050] Regarding the shape of the magnet, an annular magnet is used in the embodiment of the utility model, including an inner annular magnet 8 and an outer annular magnet 7, and the two are adapted in an inner-outer nesting manner. The inner annular magnet 8 is nested in the outer annular magnet 7, and there can be a given gap between the two, and the gap is 0.5~5mm, that is, there is no direct contact between the two.

[0051] pass Figure 1 and Figure 2 The illustrated structure can ensure that the inner annular magnet 8 and the outer annular magnet 7 maintain good coaxiality, so that the gap between them is relatively uniform.

[0052] The guidance of the central through hole on the cylinder head 9 to the piston rod body 11 can ensure relatively good coaxiality, and the cooperation between the lower positioning guide sleeve 24 located at the lower part of the piston rod and the connecting rod body 10 of the piston rod can further ensure better coaxiality.

[0053] The outer annular magnet 7 is fixedly arranged, that is, fixedly installed in the cylinder 22. Figure 1 and Figure 2 In the illustrated structure, the outer annular magnet 7 is fixed by positioning and clamping at both ends, that is, the outer annular magnet 7 is fixed in the cylinder barrel 22 by means of the spiral locking of the cylinder cover 9 by clamping at both ends.

[0054] It can be seen that the outer annular magnet 7 is mainly fixed with the help of the cylinder head 9. For example, the lower positioning plate 5, the lower pad 6 and the upper pad 21 can be used to adjust the size of the outer annular magnet 7 with a predetermined length when the axial length of the cylinder body is determined.

[0055] In addition, for example, the lower positioning plate 5, the lower pad 6 and the upper pad 21 can also be used for other functions. For example, the lower positioning plate 5 can also provide auxiliary guidance for the piston rod.

[0056] Relative to the outer annular magnet 7, the inner annular magnet 8 is fixedly mounted on the inner shaft section of the piston rod inserted into the cylinder body, such as fixed on Figure 1 On the connecting rod 10 shown in Figure 1 and Figure 2 In the illustrated structure, for example, a shoulder is provided at the upper end of the connecting rod 10 to position the inner annular magnet 8, and then the inner annular magnet 8 in place is locked from the lower end.

[0057] Correspondingly, the inner annular magnet 8 is sleeved on the connecting rod 10 , and then after being sleeved in place, a positioning retaining ring 23 is used, for example, to limit the lower end of the inner annular magnet 8 .

[0058] The outer annular magnet 7 is located roughly in the middle of the cylinder body in the axial direction to provide space for the stroke of the piston rod. The lower pad 6 as mentioned above provides space for the inner annular magnet 8 to move downward, and supports the outer annular magnet 7 to a predetermined height, and requires that the inner diameter of the lower pad 6 is greater than or equal to the outer diameter of the inner annular magnet 8. When the lower end of the inner annular magnet 8 is exposed from the lower end of the outer annular magnet 7, it will not directly impact the cylinder seat 4. The thickness of the lower pad 6 is adjusted according to the designed stroke, and the thickness is its axial length.

[0059] In addition, an annular upper pad 21 is provided between the upper end of the outer annular magnet 7 and the cylinder cover 9, and the inner diameter of the upper pad 21 is greater than or equal to the outer diameter of the inner annular magnet 8. The upper pad 21 is used to adjust the maximum dead point position of the piston rod's upper stroke.

[0060] As mentioned above, the coaxiality between the inner annular magnet 8 and the outer annular magnet 7 determines the reliability of their use. In particular, if the axes of the two are deviated from each other, an uncertain change in the magnetic flux around the inner annular magnet 8 will occur. Therefore, in the embodiment of the utility model, a lower positioning plate 5 is further provided between the lower pad 5 and the cylinder seat 4 in the cylinder body; wherein a guide hole is opened in the center of the lower positioning plate 5; accordingly, if Figure 1 The lower end of the connecting rod 10 shown in FIG. 1 is guided in the guide hole.

[0061] In order to reduce the friction coefficient, a wear-resistant sleeve is set in the guide hole, such as Figure 1 The lower positioning guide sleeve 24 shown in the figure is a copper sleeve, such as a tin bronze sleeve.

[0062] In order to facilitate adjustment and production, the piston rod is an assembly structure, and includes multiple parts connected to each other; Figure 1 and Figure 2 In the illustrated structure, the piston rod is a three-segment structure, in which the piston rod body 11 is a connecting base and is guided to the central through hole. The piston rod body 11 is generally thicker, which will limit the size of the inner ring magnet 8 when adapting to the inner hole diameter of the inner ring magnet 8. Therefore, the existence of the connecting rod 10 can better adapt to different sizes of the inner ring magnet 8, specifically the inner hole diameter of the inner ring magnet 8.

[0063] Figure 1 and Figure 2 In the figure, the connecting rod 10 is in the shape of a stepped shaft, the uppermost shaft section is a threaded shaft section, and is the shaft section with the largest diameter, and has a shaft shoulder, and the diameter of the shaft section located below is relatively small, and the shaft shoulder constitutes the positioning shaft shoulder of the inner annular magnet 8.

[0064] And the lower end of the connecting rod 10 is guided by the lower positioning guide sleeve 24 .

[0065] Figure 1 and Figure 2 In the embodiment, the piston rod body 11 is an internal threaded sleeve; the connecting rod 10 is threadedly connected with the internal thread of the piston rod body 11 by means of the threaded shaft section.

[0066] The other shaft section of the piston rod is as follows Figure 1 The adjusting rod 12 shown in the figure has a main body of a screw rod, and the adjusting rod 12 adjusts the overall length of the piston rod by means of the cooperation between the screw rod and the piston rod body 11 having an internal threaded sleeve structure.

[0067] Accordingly, the adjusting rod 12 has a sleeve located outside the cylinder 22, that is, Figure 1 The upper sleeve 13 is shown in the figure, and a locking hole for locking the adjusting rod 12 is opened on the side of the piston rod body 11.

[0068] Furthermore, a stop screw 16 cooperating with the locking hole is provided to lock the adjusting rod 12 .

[0069] A rotation-stop groove 17 is formed on the side of the adjusting rod 12 , and the rotation-stop screw 16 is inserted into the rotation-stop groove 17 to form a relatively reliable rotation stop.

Claims

1. A magnetic buffer, characterized in that: include: The cylinder body comprises a cylinder barrel and a cylinder seat sealing the cylinder barrel at one end, and the other end of the cylinder barrel has an internal thread; The cylinder cover is a disc-shaped cylinder cover having an external thread and a central through hole, and the cylinder cover is sealed to the other end of the cylinder barrel by means of the cooperation between the external thread and the internal thread; The piston rod is inserted into the cylinder body through the central through hole and guided in the central through hole; The inner annular magnet is fixedly mounted on the inner shaft section where the piston rod is inserted into the cylinder body; The outer annular magnet is fixedly mounted in the cylinder body, and the inner annular magnet is nested in the outer annular magnet, and the axis of the outer annular magnet is colinear with the axis of the inner annular magnet.

2. The magnetic buffer according to claim 1, characterized in that The outer annular magnet is located in the middle of the cylinder body in the axial direction; A corresponding annular bottom plate is provided to support the outer annular magnet to a predetermined height; The inner diameter of the lower pad is greater than or equal to the outer diameter of the inner annular magnet.

3. The magnetic buffer according to claim 2, characterized in that A lower positioning plate is also provided between the lower pad and the cylinder seat in the cylinder body; A guide hole is provided in the center of the lower positioning plate; Correspondingly, the end of the inner shaft section has a rod portion guided in the guide hole.

4. The magnetic buffer according to claim 3, characterized in that A wear-resistant sleeve is inlaid in the guide hole.

5. The magnetic buffer according to claim 3, characterized in that The piston rod is an assembly and includes a plurality of parts connected to each other; the piston rod correspondingly includes: The piston rod body is guided in the central through hole; The connecting rod is connected to one end of the piston rod body located at the cylinder barrel, and the connecting rod has the inner shaft section.

6. The magnetic buffer according to claim 5, characterized in that The piston rod body is an internal threaded sleeve; The connecting rod is a stepped shaft body, and the shaft section connected to the piston rod is a threaded shaft section, which is threadedly connected to the internal thread of the piston rod body.

7. The magnetic buffer according to claim 6, characterized in that The shaft shoulder provided by the threaded shaft section is used for positioning one end of the inner annular magnet; a positioning retaining ring or a round nut is also provided for positioning and locking the other end of the inner annular magnet.

8. The magnetic buffer according to claim 6, characterized in that The piston rod also includes an adjusting rod which is sleeved on the piston rod body and threadedly connected between the piston rod body and is used to adjust the length of the piston rod; Correspondingly, the adjusting rod has a sleeve located outside the cylinder, and a locking hole for locking the adjusting rod is opened on the side of the piston rod body; A rotation-stop screw matched with the locking hole is provided to lock the adjusting rod.

9. The magnetic buffer according to claim 2, characterized in that: An annular upper pad is arranged between the other end of the outer annular magnet and the cylinder cover, and the inner diameter of the upper pad is greater than or equal to the outer diameter of the inner annular magnet.

10. A roller can ear, characterized in that: A magnetic buffer comprising any one of claims 1 to 9.

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