Shadowless lamp anti-shake structure and using method thereof

Abstract

The invention provides an anti-shake structure of a shadowless lamp and a using method of the anti-shake structure, the anti-shake structure comprises a movable buffer block, and a first connecting rod and a second connecting rod are slidably inserted into the movable block and used for being connected with a lamp holder and a cantilever respectively; a first sealing cavity and a second sealing cavity are formed in the movable buffer block, and the first connecting rod and the second connecting rod are inserted into the first sealing cavity and the second sealing cavity respectively, are the same in axial direction and can slide in the axial direction. The two sealing cavities are filled with magnetorheological fluid, electromagnetic coils are fixed to the two sealing cavities, and the two sealing cavities are further provided with buffering elastic pieces connected with the movable buffering blocks and the connecting rods. Distance measuring sensors are arranged on the rod walls, located on the outer side of the movable buffer block, of the two connecting rods and used for obtaining the sliding distance of the connecting rods relative to the movable buffer block; and the control unit is in telecommunication connection with the two electromagnetic coils and the two distance measuring sensors. According to the structure, power-on nodes of the two electromagnetic coils are controlled, so that the kinetic energy consumption of the lamp holder is accelerated, and the vibration time of the lamp holder is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of shadowless lamps, in particular to an anti-vibration structure of a shadowless lamp and a use method thereof. Background Art

[0002] Shadowless lamp is a kind of lamp that can eliminate the shadow of objects under the light as much as possible. Therefore, it is widely used in the medical field as a lighting lamp during surgery.

[0003] All shadowless lamps include a lamp head and a cantilever connected to the lamp head. In order to cushion the lamp head, some shadowless lamps will be equipped with a buffer mechanism on the cantilever to reduce the impact of the cantilever vibration on the lamp head and ensure the stability of the light. At the same time, it can also provide buffering when the lamp head is hit, thereby reducing the injuries to the people involved in the collision and avoiding damage to the lamp head due to collision.

[0004] However, in actual use, when the lamp head is hit, it will cause a large vibration of the lamp head, and due to the existence of the buffer mechanism, the swing buffer time from the vibration of the lamp head to the stop is very long, and the doctor needs to interfere with it to make the lamp head stop quickly, which distracts the doctor's attention and energy and affects the progress of the operation. At the same time, long-term vibration will also reduce the service life of the lamp head and cantilever. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides an anti-vibration structure of a shadowless lamp and a method of using the same.

[0006] The technical solution of the present invention is as follows:

[0007] A shadowless lamp anti-vibration structure is connected between the lamp head and the cantilever of the shadowless lamp, and comprises a movable buffer block, on which a first connecting rod and a second connecting rod are slidably inserted, respectively used to connect the lamp head and the cantilever;

[0008] A first sealing cavity and a second sealing cavity are provided in the movable buffer block, and the first connecting rod and the second connecting rod are respectively inserted into the first sealing cavity and the second sealing cavity, and have the same axial direction and can slide along the axial direction;

[0009] The two sealed chambers are filled with magnetorheological fluid, and are fixed with electromagnetic coils, and are also provided with buffer elastic parts connecting the movable buffer block and the connecting rod;

[0010] Distance measuring sensors are provided on the rod walls of the two connecting rods located outside the moving buffer block, which are used to obtain the sliding distance of the connecting rod relative to the moving buffer block;

[0011] It also includes a control unit which is electrically connected to the two electromagnetic coils and the two distance measuring sensors.

[0012] When the lamp head is hit, the first connecting rod and the movable buffer block will be driven to move toward the direction of the cantilever. The buffer elastic parts in the first sealed cavity and the second sealed cavity will buffer the first connecting rod and the movable buffer block to prevent the lamp head or the person who hits the lamp head from being damaged.

[0013] During the periodic vibration of the first connecting rod and the movable buffer block, the kinetic energy of the buffer elastic part can be offset by controlling the alternating on and off of power to the electromagnetic coils in the first sealed cavity and the second sealed cavity, thereby greatly reducing the amplitude of the lamp holder in each vibration cycle and shortening the vibration duration of the lamp holder.

[0014] In order to prevent the magnetic fields generated by the electromagnetic coils in the two sealed chambers from affecting the changes of the magnetorheological fluid, a magnetic isolation plate is provided between the first sealed chamber and the second sealed chamber.

[0015] In order to allow the two connecting rods to have sufficient sliding space, the length of the first sealing cavity and the second sealing cavity in the axial direction of the connecting rod is not less than the maximum deformation length of the buffer elastic member.

[0016] Preferably, one end of the first connecting rod not connected to the lamp holder passes through the first sealed cavity, and one end of the second connecting rod not connected to the cantilever passes through the second sealed cavity to ensure stable sliding of the two connecting rods and stable support of the lamp holder.

[0017] Preferably, the buffer elastic member is a tension spring, which is sleeved on the connecting rod.

[0018] The two buffer elastic members preferably use tension springs with the same size and elastic coefficient.

[0019] In order to reduce the impact force of the movable buffer block on the two connecting rods when the magnetorheological fluid hardens, the movable buffer block is made of lightweight material.

[0020] As a preferred solution of the present application, the two connecting rods are coaxially arranged, the two sealing cavities are distributed along the axial direction of the connecting rods, and the two connecting rods are subjected to the forces of the two buffer elastic members in the same axial direction.

[0021] As another preferred solution of the present application, the two connecting rods are arranged in parallel, and the two sealed cavities are distributed in a direction perpendicular to the axes of the two connecting rods, which can shorten the distance between the lamp holder and the cantilever and reduce the overhang distance of the lamp holder.

[0022] The present application also provides a method for using the anti-trembling structure of a shadowless lamp, based on the above-mentioned anti-trembling structure of a shadowless lamp, comprising the following steps:

[0023] S1: Acquire the distance a between the distance measuring sensor on the first connecting rod and the moving buffer block, and the distance b between the moving buffer block and the distance measuring sensor on the second connecting rod when the lamp head is stationary;

[0024] S2: Obtain the distance between the distance measuring sensor on the first connecting rod and the moving buffer block in real time, calculate it with the value a, and obtain the difference Δa; obtain the distance between the moving buffer block and the distance measuring sensor on the second connecting rod in real time, calculate it with the value b, and obtain Δb. If Δa is measured t-1 =0, Δb t-1 =0, Δa t and / or Δb t When it is not equal to 0, it is determined that the lamp head has collided and step S3 is executed; otherwise, no action is taken;

[0025] Among them, t represents the tth moment, Δa t and Δb t are the values ​​of Δa and Δb at time t respectively;

[0026] S3: After time t, the first measurement of |Δa m+1 +Δb m+1 |<|Δa m +Δb m |, and |Δa m +Δb m |>|Δa m-1 +Δb m-1 |Δa m +Δb m |Compare with the acceptable vibration amplitude threshold, if it is greater than the threshold, execute step S4, otherwise, end the step;

[0027] Where m represents the mth moment after moment t;

[0028] S4: Controlling the electromagnetic coil in the first sealed cavity to be energized to lock the buffer elastic member in the first sealed cavity;

[0029] S5: After time m, |Δb is measured for the first time n+1 |<|Δb n |, and |Δb n |>|Δb n-1 |, the electromagnetic coil in the first sealed cavity is controlled to be powered off;

[0030] Where n represents the nth moment after moment m;

[0031] S6: After n time, |Δb is measured for the first time p-1 |>|Δb p |=|Δb n |*1 / 2, the electromagnetic coil in the second sealed cavity is energized to lock the buffer elastic member in the second sealed cavity;

[0032] Where p represents the pth moment after n moments;

[0033] S7: After time p, Δa is measured for the first timeq =0, the electromagnetic coil in the first sealed cavity is energized, the buffer elastic member in the first sealed cavity is locked, and the electromagnetic coil in the second sealed cavity is de-energized;

[0034] Among them, q represents the qth moment after moment p;

[0035] S8: After time q, Δb is measured for the first time r =0, the electromagnetic coil in the second sealed cavity is controlled to be energized, the buffer elastic member in the second sealed cavity is locked, and after waiting for a preset time, the electromagnetic coils in the first sealed cavity and the second sealed cavity are controlled to be de-energized at the same time, and the step ends;

[0036] Where r represents the rth moment after moment q.

[0037] The present invention provides an anti-vibration structure for a shadowless lamp and a method of using the same. The structure plans to alternately control the electrification of electromagnetic coils in two sealed cavities to harden the magnetorheological fluid, thereby buffering the shaking of the lamp head and gradually absorbing and dissipating the vibration kinetic energy of the lamp head. At the same time, through the control of the energized nodes, the two buffering components can offset each other's capabilities, quickly reduce the vibration amplitude of the lamp head, and shorten the vibration duration of the lamp head. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In the attached picture:

[0039] Figure 1 It is a schematic diagram of the anti-tremor structure of the shadowless lamp;

[0040] Figure 2 It is a schematic diagram of another embodiment of the anti-tremor structure of a shadowless lamp.

[0041] The components represented by the reference numerals in the figure are:

[0042] 11. Moving buffer block; 12. First connecting rod; 13. Second connecting rod; 14. First sealed cavity; 15. Second sealed cavity; 16. Electromagnetic coil; 17. Buffer elastic member; 18. Magnetic isolation plate; 2. Lamp holder; 3. Cantilever. DETAILED DESCRIPTION

[0043] Embodiment 1:

[0044] like Figure 1 As shown, this embodiment provides an anti-tremor structure for a shadowless lamp, which is connected between the lamp head 2 and the cantilever 3 of the shadowless lamp. The cantilever 3 is directly or indirectly connected to the base or the indoor roof, etc. The specific structure of the lamp head 2 and the cantilever 3 is a common structure in the prior art and will not be described in detail here.

[0045] The anti-trembling structure of the shadowless lamp includes a moving buffer block 11, on which a first connecting rod 12 and a second connecting rod 13 are slidably inserted, one end of the first connecting rod 12 is inserted into the moving buffer block 11, and the other end is used to connect the lamp head 2, and one end of the second connecting rod 13 is inserted into the moving buffer block 11, and the other end is used to be fixedly connected to the cantilever 3. When sliding, the moving buffer block 11 slides relative to the second connecting rod 13, and the first connecting rod 12 slides relative to the moving buffer block 11. The axial directions of the first connecting rod 12 and the second connecting rod 13 are the same and can slide along the axial direction.

[0046] The mobile buffer block 11 is provided with a first sealed cavity 14 and a second sealed cavity 15, and the first connecting rod 12 and the second connecting rod 13 are respectively inserted into the first sealed cavity 14 and the second sealed cavity 15. Both sealed cavities are filled with magnetorheological fluid, and an electromagnetic coil 16 is fixed thereto, and a buffer elastic member 17 connecting the mobile buffer block 11 and the connecting rod is also provided.

[0047] When the anti-vibration structure is not activated, the electromagnetic coil 16 is not powered off, the magnetorheological fluid is in a high-fluidity Newtonian fluid state, the first connecting rod 12 can slide freely relative to the movable buffer block 11, and the movable buffer block 11 can slide freely relative to the second connecting rod 13.

[0048] When the anti-vibration structure is activated and the electromagnetic coil 16 is energized, the magnetorheological fluid behaves as a Bingham fluid with high viscosity and low fluidity under the magnetic field generated by the electromagnetic coil 16 , thereby limiting the movement of the first connecting rod 12 and / or the movable buffer block 11 .

[0049] The two connecting rods are provided with distance measuring sensors (not shown in the figure) on the rod walls located on the outside of the movable buffer block 11, which are used to obtain the sliding distance of the connecting rod relative to the movable buffer block 11 in real time, or in other words, to obtain the sliding distance of the first connecting rod 12 relative to the movable buffer block 11 and the movable buffer block 11 relative to the second connecting rod 13.

[0050] The anti-tremor structure of the shadowless lamp also includes a control unit (not shown in the figure), which is electrically connected to the two electromagnetic coils 16 and the two distance sensors, receives information obtained by the distance sensors, and controls whether the electromagnetic coils 16 are energized after analysis and judgment.

[0051] The present embodiment provides an anti-tremor structure for a shadowless lamp. When the magnetorheological fluid is in a Newtonian fluid state, the first connecting rod 12 and the movable buffer block 11 can slide freely, and the buffer elastic member 17 has a buffering effect on the first connecting rod 12 and the movable buffer block 11. Furthermore, when the lamp head 2 is collided, the lamp head 2 is buffered to avoid damage to the lamp head 2 or the person who collides.

[0052] During the periodic vibration of the first connecting rod 12 and the movable buffer block 11, the electromagnetic coil 16 in the first sealed cavity 14 and the second sealed cavity 15 is controlled to be alternately turned on and off, so as to offset the kinetic energy of the buffer elastic member 17, reduce the amplitude of the lamp holder 2 in each vibration cycle, and shorten the vibration duration of the lamp holder 2.

[0053] In this embodiment, the two connecting rods are coaxially arranged, and the two sealing cavities are distributed along the axial direction of the connecting rods, so that the two connecting rods are respectively subjected to the forces of the two buffer elastic members 17 in the same axial direction, and thus no torsional force is generated when the two forces offset or superimpose each other, thereby reducing the requirements for structural lightness of the connecting rods and the movable buffer block 11.

[0054] The length of the first sealing cavity 14 and the second sealing cavity 15 in the axial direction of the connecting rod is not less than the maximum deformation length of the buffer elastic member 17, so as to provide sufficient sliding space for the sliding of the two connecting rods.

[0055] The electromagnetic coil 16 is preferably fixed on the inner side walls of the first sealed cavity 14 and the second sealed cavity 15, respectively, and is disposed around the first connecting rod 12 and the second connecting rod 13, respectively.

[0056] In order to prevent the magnetic field generated by the electromagnetic coils 16 in the two sealed chambers from affecting the changes of each other's magnetorheological fluid, a magnetic isolation plate 18 is further provided between the first sealed chamber 14 and the second sealed chamber 15 .

[0057] The buffer elastic member 17 is preferably a tension spring, which is sleeved on the connecting rod. Figure 1 As shown, one end of the tension spring in the first sealed cavity 14 away from the lamp holder 2 is fixed to the first connecting rod 12, and the other end is fixed to the movable buffer block 11. The one end of the tension spring in the second sealed cavity 15 away from the cantilever 3 is fixed to the second connecting rod 13, and the other end is fixed to the movable buffer block 11. In this way, when the first connecting rod 12 slides and the movable buffer block 11 slides toward the cantilever 3 at the same time, the two tension springs are stretched at the same time.

[0058] Preferably, the tension springs used in the two buffer elastic members 17 are preferably the same in size and elastic coefficient.

[0059] In addition, in order to reduce the impact force of the movable buffer block 11 on the two connecting rods when the magnetorheological fluid hardens, the movable buffer block 11 is made of lightweight material, which can also reduce the overall weight of the shadowless lamp.

[0060] When the lamp holder 2 needs to be moved, the anti-vibration structure of the present application can energize the electromagnetic coils 16 in the two sealed cavities at the same time, fix the two connecting rods, and facilitate the fast and sensitive movement of the lamp holder 2. After the movement is completed, the two electromagnetic coils 16 are de-energized at the same time, so that the anti-vibration structure can provide buffering and anti-vibration effects for the lamp holder 2.

[0061] Embodiment 2:

[0062] like Figure 2 As shown, the structure of this embodiment is basically the same as that of the embodiment, except that the two connecting rods are arranged in parallel, and the two sealed cavities are distributed in a direction perpendicular to the axes of the two connecting rods, so that the two connecting rods can slide in parallel in an overlapping manner, which can shorten the distance between the lamp holder 2 and the cantilever 3 and reduce the overhang distance of the lamp holder 2.

[0063] In addition, the end of the first connecting rod 12 not connected to the lamp holder 2 can also pass through the first sealed cavity 14, and the end of the second connecting rod 13 not connected to the cantilever 3 can also pass through the second sealed cavity 15 to ensure stable sliding of the two connecting rods and stable support of the lamp holder 2.

[0064] Embodiment three:

[0065] Please refer to Figure 1 or Figure 2 This embodiment provides a method for using the anti-trembling structure of a shadowless lamp. The anti-trembling structure of a shadowless lamp based on the above embodiment includes the following steps:

[0066] S1: Acquire the distance a between the distance measuring sensor on the first connecting rod 12 and the moving buffer block 11, and the distance b between the moving buffer block 11 and the distance measuring sensor on the second connecting rod 13 when the lamp head 2 is stationary;

[0067] S2: Real-time acquisition of the distance between the distance measuring sensor on the first connecting rod 12 and the moving buffer block 11, and calculation with the value a to obtain the difference Δa; real-time acquisition of the distance between the moving buffer block 11 and the distance measuring sensor on the second connecting rod 13, and calculation with the value b to obtain Δb. If Δa is measured t-1 =0, Δb t-1 =0, Δa t and / or Δb t When it is not equal to 0, it is determined that the lamp head 2 has collided and step S3 is executed; otherwise, no action is taken;

[0068] Among them, t represents the tth moment, Δa t and Δb t are the values ​​of Δa and Δb at time t respectively;

[0069] When the lamp head 2 is hit, the first connecting rod 12 and the movable buffer block 11 will move in the same direction. When they move towards the cantilever 3 at the same time, Δa t and Δbt At the same time, it is a negative value. On the contrary, Δa t and Δb t Also positive value.

[0070] For the convenience of explanation, the present embodiment takes the lamp head 2 moving towards the cantilever 3 after collision as an example. Figure 1 or Figure 2 As shown, the buffer elastic member 17 is stretched.

[0071] S3: After time t, the first measurement of |Δa m+1 +Δb m+1 |<|Δa m +Δb m |, and |Δa m +Δb m |>|Δa m-1 +Δb m-1 |Δa m +Δb m |Compare with the acceptable vibration amplitude threshold, if it is greater than the threshold, execute step S4, otherwise, end the step;

[0072] Where m represents the mth moment after moment t;

[0073] In this step, at time m, the two buffer elastic members 17 are at the maximum value of tensile deformation, the lamp holder 2, the first connecting rod 12 and the movable buffer block 11 are all at a speed of 0. At this time, the measured |Δa m +Δb m | is the maximum vibration amplitude of the lamp holder 2. If there is no external intervention, the lamp holder 2 will use this as the maximum amplitude and shake back and forth until the energy is dissipated. m +Δb m |When the vibration is greater than the acceptable threshold, it will affect the use and anti-vibration buffering is required.

[0074] S4: Controlling the electromagnetic coil 16 in the first sealed cavity 14 to be energized, locking the buffer elastic member 17 in the first sealed cavity 14;

[0075] When the electromagnetic coil 16 in the first sealed cavity 14 is energized, a magnetic field is generated, causing the magnetorheological fluid in the first sealed cavity 14 to be in a Bingham fluid state, fixing the first connecting rod 12 and the buffer elastic member 17 connected to the first connecting rod 12, leaving only the buffer elastic member 17 in the second sealed cavity 15 to push the movable buffer block 11, the first connecting rod 12 and the lamp holder 2 to move away from the cantilever 3, releasing the elastic potential energy contained therein. It should be understood that the elastic potential energy is half of the energy obtained by the lamp holder 2 when colliding.

[0076] In this step, the buffer elastic member 17 in the second sealing cavity 15 is gradually shortened to a compressed state, and the Δb value is gradually reduced from a positive value to a negative value.

[0077] S5: After time m, |Δb is measured for the first time n+1 |<|Δb n |, and |Δb n |>|Δb n-1 |, controlling the electromagnetic coil (16) in the first sealed chamber (14) to be powered off;

[0078] Where n represents the nth moment after moment m;

[0079] At time n, the lamp head 2, the first connecting rod 12 and the movable buffer block 11 as a whole have a moving speed of 0, and will move towards the cantilever 3 in the next step.

[0080] It can be seen from the deformation motion characteristics of the elastic part that, without considering the energy loss, the tensile deformation of the buffer elastic part 17 at time m and the compressive deformation of the buffer elastic part 17 at time n should be the same. When the buffer elastic parts 17 in the two sealed cavities adopt the same specifications, it can be calculated that at time n, the lamp head 2 is located at the position of the initial static moment. Considering the energy loss in the elastic deformation motion, the lamp head 2 will also be near the position of the initial static moment, close to the side of the cantilever 3.

[0081] At time n+1, the electromagnetic coil 16 in the first sealed cavity 14 is powered off. At this time, the lamp holder 2 will move toward the cantilever 3 at a certain speed under the action of the buffer elastic member 17 in the second sealed cavity 15. However, according to the elastic deformation speed variation rule, the speed is small and can be ignored.

[0082] After the electromagnetic coil 16 in the first sealed cavity 14 is powered off, the magnetorheological fluid in the first sealed cavity 14 returns to the Newtonian fluid state, and the buffer elastic member 17 in the first sealed cavity 14 releases elastic potential energy. Since the buffer elastic member 17 in the first sealed cavity 14 and the buffer elastic member 17 in the second sealed cavity 15 have opposite deformation states, one is shortened from the stretched state and the other is extended from the compressed state, the mutual deformation of the two can be offset, so that the lamp holder 2 can be kept basically motionless, or slightly moved away from the cantilever 3.

[0083] S6: After n time, |Δb is measured for the first time p-1 |>|Δb p |=|Δb n |*1 / 2, the electromagnetic coil 16 in the second sealed cavity 15 is energized to lock the buffer elastic member 17 in the second sealed cavity 15;

[0084] Where p represents the pth moment after n moments;

[0085] In this step, at time p, the first connecting rod 12 and the movable buffer block 11 both move toward the cantilever 2 and have not yet recovered to the length before the collision with the lamp head 2. Since the movable buffer block 11 is acted upon by the two buffer elastic members 17 at the same time when moving, it will have a faster speed and greater energy when recovering to the length before the collision. Therefore, in this step, at |Δb p |=|Δb n |*1 / 2, the buffer elastic member 17 in the second sealed cavity 15 is locked, and the moving buffer block 11 is fixed when it has not yet reached a large speed and energy, dissipating its energy. At this time, the buffer elastic member 17 in the first sealed cavity 14 is still in a compressed state, but |Δa p | will be greater than 0 and less than |Δa m |*1 / 2.

[0086] S7: After time p, Δa is measured for the first time q =0, the electromagnetic coil 16 in the first sealed cavity 14 is energized, the buffer elastic member 17 in the first sealed cavity 14 is locked, and the electromagnetic coil 16 in the second sealed cavity 15 is de-energized;

[0087] Among them, q represents the qth moment after moment p;

[0088] In this step, since the buffer elastic member 17 in the first sealed cavity 14 is in a compressed state before moment q, in step S6, after the buffer elastic member 17 in the second sealed cavity 15 is locked, the buffer elastic member 17 in the first sealed cavity (14) will exert a reaction force on the first connecting rod 12, pushing the lamp head 2 away from the cantilever 3. In step S7, the first connecting rod 12 and the movable buffer block 17 can be bound together, with a speed away from the cantilever 3, and at the same time, the buffer elastic member 17 in the first sealed cavity (14) no longer produces deformation. At this time, the buffer elastic member 17 in the second sealed cavity 15 is in a stretched state. After being unlocked, it is opposite to the force of the first connecting rod 12 and the movable buffer block 17, and the energy is mutually eliminated.

[0089] As mentioned above, the speed at which the first connecting rod 12 and the movable buffer block 17 move away from the cantilever 3 is determined by the |Δa of the buffer elastic member 17 in the first sealing cavity 14. p |Compression deformation occurs, which is less than |Δa m |*1 / 2, and at this time the tensile deformation of the buffer elastic member 17 in the second sealed cavity 15 |Δb p | still has a value equal to |Δb n |*1 / 2 deformation, and |Δb n |Almost the same as Δa m are equal, so the lamp head will turn back and move towards the cantilever 3.

[0090] It can be seen from the above description that in steps S5, S6 and S7, the method of this embodiment can make the lamp head 2 always vibrate for a short distance near its position before the collision, thereby reducing the impact of the lamp head 2 on normal use after the collision.

[0091] S8: After time q, Δb is measured for the first time r =0, the electromagnetic coil 16 in the second sealed cavity 15 is energized, the buffer elastic member 17 in the second sealed cavity 15 is locked, and after waiting for a preset time, the electromagnetic coils 16 in the first sealed cavity 14 and the second sealed cavity 15 are deenergized at the same time, and the step ends;

[0092] Where r represents the rth moment after moment q.

[0093] In this step, the buffer elastic member 17 in the second sealed cavity 15 is locked at time r. At this time, the lengths of the two buffer elastic members 17 in the two sealed cavities are the lengths of the lamp holder 2 before the collision, and the lamp holder 2 is in the position before the collision.

[0094] The reason why the present embodiment does not use two buffer elastic members 17 to release elastic potential energy at the same time and energize the two electromagnetic coils 16 to lock the deformation of the two buffer elastic members 17 to stop the movement of the lamp holder 2 when the natural length is restored at the same time, and the reason why the buffer elastic members 17 in the second sealed cavity 15 are not locked in deformation when the natural length is restored for the first time is, firstly, to enable the lamp holder 2 to move back to the position before the collision; secondly, if two buffer elastic members 17 are used to release potential energy at the same time and the deformation of the buffer elastic members 17 is locked when the natural length is restored for the first time, the kinetic energy generated by the collision of the lamp holder 2 will all act on the cantilever 3 and the rear connecting structure, which places higher requirements on the material, structural strength and load convenience of the cantilever 3 and other structures, and the corresponding cost will also increase. At the same time, the larger load will also reduce the service life of the cantilever 3 and other structures. The method of this embodiment gradually reduces the vibration amplitude of the lamp holder 2 by controlling the timing of releasing the potential energy of the buffer elastic member 17, which not only buffers the lamp holder 2 but also avoids damage to the cantilever 3 and other structures. At the same time, it can also quickly reduce the vibration amplitude of the lamp holder 2 and shorten the vibration time.

Claims

1. A shadowless lamp anti-vibration structure, connected between a lamp head (2) and a cantilever (3) of the shadowless lamp, characterized in that: It comprises a movable buffer block (11), on which a first connecting rod (12) and a second connecting rod (13) are slidably inserted and respectively used to connect the lamp holder (2) and the cantilever (3); The movable buffer block (11) is provided with a first sealed cavity (14) and a second sealed cavity (15), and the first connecting rod (12) and the second connecting rod (13) are respectively inserted into the first sealed cavity (14) and the second sealed cavity (15) and have the same axial direction and can slide along the axial direction; The two sealed cavities are filled with magnetorheological fluid, and are fixed with an electromagnetic coil (16). A buffer elastic member (17) is also provided for connecting the movable buffer block (11) and the connecting rod. Distance measuring sensors are provided on the rod walls of the two connecting rods located outside the moving buffer block (11) for obtaining the sliding distance of the connecting rod relative to the moving buffer block (11) in real time; It also comprises a control unit which is electrically connected to the two electromagnetic coils (16) and the two distance measuring sensors.

2. The anti-vibration structure of a shadowless lamp as claimed in claim 1, characterized in that: A magnetic isolation plate (18) is provided between the first sealed cavity (14) and the second sealed cavity (15).

3. The anti-trembling structure of a shadowless lamp as claimed in claim 2, characterized in that: The lengths of the first sealing cavity (14) and the second sealing cavity (15) in the axial direction of the connecting rod are not less than the maximum deformation length of the buffer elastic member (17).

4. The anti-trembling structure of a shadowless lamp as claimed in claim 3, characterized in that: One end of the first connecting rod (12) not connected to the lamp holder (2) passes through the first sealed cavity (14), and one end of the second connecting rod (13) not connected to the cantilever (3) passes through the second sealed cavity (15).

5. The anti-vibration structure of a shadowless lamp as claimed in claim 1, characterized in that: The buffer elastic member (17) is a tension spring and is sleeved on the connecting rod.

6. The anti-trembling structure of a shadowless lamp as claimed in claim 5, characterized in that: The two buffer elastic members (17) are tension springs with the same size and elastic coefficient.

7. The anti-vibration structure of a shadowless lamp as claimed in claim 1, characterized in that: The movable buffer block (11) is made of lightweight material.

8. The anti-trembling structure of a shadowless lamp as claimed in claim 1, characterized in that: The two connecting rods are coaxially arranged, and the two sealing chambers are distributed along the axial direction of the connecting rods.

9. The anti-trembling structure of a shadowless lamp as claimed in claim 1, characterized in that: The two connecting rods are arranged in parallel, and the two sealing cavities are distributed along a direction perpendicular to the axes of the two connecting rods.

10. A method for using an anti-trembling structure of a shadowless lamp, based on the anti-trembling structure of a shadowless lamp according to any one of claims 1 to 9, comprising the following steps: S1: acquiring the distance a between the distance measuring sensor on the first connecting rod (12) and the moving buffer block (11), and the distance b between the moving buffer block (11) and the distance measuring sensor on the second connecting rod (13) when the lamp head (2) is stationary; S2: obtaining in real time the distance between the distance measuring sensor on the first connecting rod (12) and the moving buffer block (11), calculating with the value a to obtain a difference Δa, obtaining in real time the distance between the moving buffer block (11) and the distance measuring sensor on the second connecting rod (13), calculating with the value b to obtain Δb, if Δa is measured t-1 =0, Δb t-1 =0, Δa t and / or Δb t When it is not equal to 0, it is determined that the lamp head (2) has collided and step S3 is executed; otherwise, no action is taken; in, t represents the tth moment, Δa t and Δb t are the values ​​of Δa and Δb at time t respectively; S3: After time t, the first measurement of |Δa m+1 +Δb m+1 |<|Δa m +Δb m |, and |Δa m +Δb m |>|Δa m-1 +Δb m-1 |Δa m +Δb m |Compare with the acceptable vibration amplitude threshold, if it is greater than the threshold, execute step S4, otherwise, end the step; Where m represents the mth moment after moment t; S4: controlling the electromagnetic coil (16) in the first sealed cavity (14) to be energized, thereby locking the buffer elastic member (17) in the first sealed cavity (14); S5: After time m, |Δb is measured for the first time n+1 |<|Δb n |, and |Δb n |>|Δb n-1 |, controlling the electromagnetic coil (16) in the first sealed chamber (14) to be powered off; Where n represents the nth moment after moment m; S6: After n time, |Δb is measured for the first time p-1 |>|Δb p |=|Δb n When the electromagnetic coil (16) in the second sealed cavity (15) is energized, the buffer elastic member (17) in the second sealed cavity (15) is locked; Where p represents the pth moment after n moments; S7: After time p, Δa is measured for the first time q =0, the electromagnetic coil (16) in the first sealed chamber (14) is controlled to be energized, the buffer elastic member (17) in the first sealed chamber (14) is locked, and the electromagnetic coil (16) in the second sealed chamber (15) is controlled to be de-energized; Among them, q represents the qth moment after moment p; S8: After time q, Δb is measured for the first time r =0, the electromagnetic coil (16) in the second sealed cavity (15) is controlled to be energized, the buffer elastic member (17) in the second sealed cavity (15) is locked, and after waiting for a preset time, the electromagnetic coils (16) in the first sealed cavity (14) and the second sealed cavity (15) are controlled to be de-energized at the same time, thus ending the step; Where r represents the rth moment after moment q.

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