JP4949881B2 - Centrifuge lid lock device - Google Patents

Description

  The present invention relates to a lid lock device for a centrifuge that uses a centrifugal force to separate a liquid sample such as blood.

  Known lid lock devices for centrifuges include those using a solenoid as a drive source (see, for example, Patent Documents 1 and 2) and a lid lock device using a drive motor.

  8 to 10 are views showing a centrifuge provided with a conventional lid locking device, FIG. 8 is a side view showing a part of the centrifuge in a state of being closed, and FIG. 9 is a centrifugal view. FIG. 10 is a front view showing a part of the centrifuge when the lid is closed, FIG. 10 is a front view showing a part of the state when the centrifuge is closed, and FIG. 11 is a drive with a speed reducer. It is a side view of a motor and a lock cam. In these drawings, a centrifuge generally indicated by reference numeral 1 has a rectangular housing 2 that opens upward, an openable / closable lid 3 that covers the upper surface opening of the housing 2, and the housing 2. The chamber 4, the rotor 5, the rotor drive motor 6 that rotates the rotor 5 at high speed, and the lid lock device 7 that locks the lid 3 when the lid is closed are configured.

  On the upper surface of the housing 2, a seal member 8 is provided which seals the gap between the housing 2 and the lid 3 by surrounding the opening of the chamber 4 and being compressed by the lid 3 when the lid is closed.

  The lid 3 is pivotally attached to the rear end edge of the upper surface of the housing 2 by a hinge 9 at the rear end, and hooks 11 as two engaging elements having rollers 10 on both sides on the lower surface front end side. (11A, 11B) are respectively suspended.

  The lid locking device 7 includes two lock cams 16 (16A, 16B) disposed on the front surface of a mounting plate 13 erected in front of the housing 2 so as to correspond to the hooks 11A, 11B, A connecting member 17 that connects the lock cams 16A and 16B to each other and operates in synchronization with each other, and one of the two lock cams 16 such as the right lock cam 16B is rotated immediately before the lid 3 is closed. A lid locking drive motor (hereinafter also simply referred to as a drive motor) 18 with a reduction gear 19 to be operated is formed.

  Further, a pair of base plates 21 (21A, 21B) are fixed near the front side end portions of the mounting plate 13. The left base plate 21A has a shaft 22, which supports one lock cam 16A rotatably. On the other hand, the drive motor 18 is fixed together with the speed reducer 19 to the right base plate 21B, and the other lock cam 16B is fixed to the drive shaft 23 of the speed reducer 19.

  The lock cam 16 integrally has a hook-shaped (reverse letter-shaped) engaging portion 24 extending at the upper end, and a lower surface thereof forms a cam surface 25 that presses the roller 10. The cam surface 25 is formed in a curved surface in which the radius of curvature from the rotation center O (FIG. 9) of the lock cam 16 gradually increases from the proximal end to the distal end of the engaging portion 24.

  In the lid locking device 7 having such a structure, the two lock cams 16A and 16B are engaged with each other by being held in a state inclined at the maximum angle to the right as shown in FIG. 9 when the lid 3 is opened. The part 24 is retracted out of the lift area of the hooks 11A and 11B of the lid 3. In this state, when the lid 3 is closed, the lid 3 is pushed down by hand and placed on the seal member 8. When the lid 3 is closed, the hook 11 is inserted into the housing 2 and the hook sensor 26 (FIG. 8) detects that the lid 3 has been closed. When the hook sensor 26 detects the hook 11, it sends a detection signal to the control unit. When the control unit receives the detection signal from the hook sensor 26, it sends a drive signal to drive the drive motor 18. When the drive motor 18 is driven, the rotation is decelerated by the speed reducer 19 and transmitted to the right lock cam 16B via the drive shaft 23. Therefore, the lock cam 16B rotates counterclockwise as shown in FIG. 10, and the cam surface 25 of the engaging portion 24 comes into contact with the upper peripheral surface of the roller 10 (FIG. 8) of the right hook 11b. Press down gradually. For this reason, the lid | cover 3 is also pushed down and the seal member 8 is compressed. At this time, as the right lock cam 16B rotates, the connecting member 17 moves rightward in FIG. 9, so that the left lock cam 16A also rotates in the same direction in conjunction with the right lock cam 16B, and the left hook 11A. The roller 10 is engaged and pushed down. Then, when the two lock cams 16A and 16B are rotated counterclockwise by the maximum angle and become substantially vertical as shown in FIG. 10, the rollers 10 of the hooks 11A and 11B are engaged with the engaging portions of the lock cams 16A and 16B. 24, the lid opening / closing sensor 27 (FIG. 8) detects the lock cam 16B. When the lid opening / closing sensor 27 detects the lock cam 16, it sends a detection signal to the control unit. The control unit stops the drive motor 18 by receiving the detection signal from the lid opening / closing sensor 27. As a result, the lid 3 is locked in a completely closed state.

  In a state where the lid 3 is completely locked by the lid lock device 7 as described above, the lock cam 16 is restrained from rotating in the unlocking direction (clockwise direction) by the gear of the drive motor 18 with the speed reducer 19 and the resistance of the motor. ing. However, even if the drive motor 18 is not driven, the lock cam 16 rotates in the same direction and engages when an external force greater in the clockwise direction than the gear and motor resistance of the drive motor 18 with the speed reducer 19 is applied. Since the part 24 is separated from the roller 10, the locked state of the lid 3 is released. When opening the closed lid 3, the switch of the lid locking drive motor 18 is turned on to drive the drive motor 18. The rotation direction of the drive shaft 23 at this time is the unlocking direction (clockwise).

Japanese Patent Laid-Open No. 10-34020 Japanese Utility Model Publication No.57-13182

  However, in the lid locking device 7 of the conventional centrifuge 1 shown in FIGS. 8 to 11, one of the two lock cams 16 is directly attached to the drive shaft 23 of the speed reducer 19. The rotation speed depends on the rotation speed of the drive shaft 23. For this reason, if the rotational speed of the lock cam 16 required by the designer does not match the rotational speed of the drive shaft of a drive motor with a reduction gear, it is necessary to manufacture a drive motor with a reduction gear. It was a factor.

  Further, the conventional lid lock device 7 prevents the lock cam 16 from rotating in the unlocking direction by the gear of the drive motor 18 with the speed reducer 19 and the resistance of the motor when the drive motor 18 is not energized. Since the lock cam 16B is directly attached to the drive shaft 23 of the speed reducer 19, a force in the direction in which the lock cam 16 opens acts on the lock cam 16, and when the drive motor 18 with the speed reducer 19 exceeds the gear resistance and the resistance of the motor. Even if 18 is not broken, there is a problem that the lock cam 16 rotates in the unlocking direction and the door lock is released.

  Further, when the rotor 5 is broken during centrifugation due to a misuse of the centrifuge 1 (for example, improper mounting of the rotor 5) and the fragments are scattered in the housing 2 and the drive motor 18 is broken, the speed reducer Since the gear of the drive motor 18 with 19 and the resistance of the motor are lost, the lock cam 16 can be freely rotated in the unlocking direction. For this reason, when a large external force is applied to the lock cam 16 and the lock cam 16 rotates in the unlocking direction, there is a problem that the locked state of the lid 3 is released and the lid 3 opens. In particular, when an inexpensive drive motor 18 is used, since the outer case of the drive motor 18 and the speed reducer 19 is often made of plastic, the cover 3 is often released from being locked.

  Also, if the lid 3 is released when the rotor 3 is broken and the lid 3 is opened, the broken pieces of the rotor 5 in the chamber 4 scatter to the outside of the housing 2 and destroy surrounding objects. There was also a problem that the worker was injured.

  Furthermore, since the conventional lid lock device 7 directly attaches the lock cam 16 to the drive shaft 23 of the speed reducer 19, the attachment position of the drive motor 18 is limited to the front and rear of the lock cam 16. However, in many cases, when the rotor 5 is broken, the mounting position coincides with a position where the broken piece breaks through the chamber 4 and scatters, so that the drive motor 18 is easily broken.

  The present invention has been made in order to solve the above-described conventional problems. The object of the present invention is to increase the degree of freedom in selecting a drive motor with a speed reducer and the degree of freedom in the mounting position of the drive motor. Accordingly, the present invention provides a lid locking device for a centrifuge that prevents the drive motor from being destroyed when the rotor is broken, and prevents the lid from being unlocked even if the drive motor is broken.

In order to achieve the above object, the present invention provides a drive motor with a speed reducer provided in a casing in a lid locking device for a centrifuge that locks an openable / closable lid that closes an opening of the casing when the lid is closed. A locking cam that engages with an engagement element provided on the lid by being rotated by the drive motor with a speed reducer when the lid is closed, and rotation of a drive shaft of the drive motor with the speed reducer. and a rotation transmitting mechanism for transmitting the lock cam, the rotation transmission mechanism and the motor cam attached to the drive shaft, and constituted by a link for connecting the the motor cam the lock cam, the free end of the motor cam, the link One end of the link is rotatably connected by a first connecting pin, and the other end of the link is rotatably connected to the lock cam by a second connecting pin. Is overrun to the opposite side of the center of rotation of the lock cam across a straight line connecting the drive shaft and the second connecting pin immediately before the closing operation is finished, and the motor cam overruns the link. And a stopper portion that restricts the displacement of the lock cam and the motor cam in the unlocking direction after stopping, and the stopper portion restricts the displacement in the unlocking direction of the link by contacting a part of the housing. It is a thing to do.

The present invention further includes a lid opening / closing sensor that detects the lock cam, and the lid opening / closing sensor detects the lock cam when the motor cam overruns, and stops the drive motor with a reduction gear according to the detection signal. Is.

In the present invention, since the drive shaft of the drive motor with a reduction gear and the lock cam are connected by the rotation transmission mechanism, the drive motor and the lock cam can be arranged apart from each other, and the degree of freedom of the installation location of the drive motor can be increased. Can be increased.
In addition, since the rotation speed of the drive shaft and the motor cam can be made different by using the rotation transmission mechanism, choices of ready-made motors are expanded, and the degree of freedom in design is increased.

  In the present invention, the link cam is provided with a stopper portion for restricting the displacement in the unlocking direction of the lock cam and the motor cam after the motor cam has overrun and stopped. The force in the opening direction is greater than the resistance of the gear and motor, the drive shaft part is not destroyed due to the destruction of the rotor, the drive motor with a speed reducer is destroyed, or the drive shaft part and the drive motor with a speed reducer are When broken, even if a force in the opening direction is applied to the lock cam, the lock cam cannot be rotated and the lid is kept locked. In particular, if the lid is opened when the rotor is broken, broken pieces of the rotor may be scattered outside the housing. In the present invention, even if the drive motor is broken, the stopper cam Therefore, there is no possibility that the lid will open and fragments of the rotor will be scattered outside the casing, and the safety of the centrifuge can be improved.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
FIG. 1 is a side view showing a partially broken state of a centrifuge having a lid locking device according to the present invention in the middle of closing, and FIG. 2 is a diagram of a state in the middle of closing the centrifuge lid. FIG. 3 is a front view showing a part of the lid completely closed, FIG. 4 to FIG. 6 are views showing the operation of the rotation transmission mechanism, and FIG. It is a bottom view which shows a stopper part. The same components and parts as those of the conventional apparatus described in FIGS. 8 to 11 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

  This embodiment shows an example in which the present invention is applied to a lid locking device 31 of a medium-sized centrifuge 30 as in the conventional centrifuge 1 shown in FIGS. The centrifuge 30 has the same structure as the centrifuge 1 except for the lid lock device 31. For this reason, a pair of left and right hooks (engagers) 11 (11A, 11B) having rollers 10 are suspended from the lower surface front end portion of the lid 3 covering the upper surface opening of the housing 2.

  The lid lock device 31 has two lock cams 16 (which are rotatably disposed at the left and right side edges near the front in the casing 2 of the centrifuge 30 so as to correspond to the hooks 11 of the lid 3, respectively. 16A, 16B), a connecting member 17 that connects and interlocks the lock cams 16A, 16B, a lid locking drive motor 18 with one speed reducer 19 that rotates the lock cam 16, and this drive A rotation transmission mechanism 32 that transmits the rotation of the motor 18 to the lock cam 16 is configured.

  The two lock cams 16A and 16B have the same shape, and are integrally formed with hook-shaped (reverse letter-shaped) engaging portions 24 extending in the direction in which the lid 3 is locked at the upper end (counterclockwise in FIG. 2). It has a substantially central portion in the height direction and is rotatably supported by horizontal shafts 36 and 37, respectively. These shafts 36 and 37 project from both sides of the front surface of the mounting plate 13 and are positioned substantially vertically below the hooks 11A and 11B when the lid 3 is closed. Further, the end portions of the connecting member 17 are connected to the right side portions of the lower ends of the two lock cams 16A and 16B via connecting pins 38 and 39, respectively.

  The drive motor 18 is disposed on the front left side edge portion of the mounting plate 13 so as to be separated below one lock cam 16A. The drive shaft 23 of the speed reducer 19 is located below the shaft 36.

  The rotation transmission mechanism 32 includes a motor cam 42, a link 43, and first and second connecting pins 44 and 45. The motor cam 42 is formed in an elongated plate shape, and its base end (one end) is fixed to the drive shaft 23, and the lower end side of the link 43 is rotated by the first connecting pin 44 at the free end (other end). It is connected freely. The link 43 is formed in a plate shape longer than the motor cam 42, and the upper end thereof is rotatably connected to the left end portion of the lower end of one lock cam 16 </ b> A by the second connecting pin 45. The rotation center O of one lock cam 16A is located on the right side of a straight line L (FIGS. 4 to 6) connecting the center of the drive shaft 23 and the center of the second connecting pin 45. Similarly, the motor cam 42 has a connecting portion (first connecting pin 44) to the link 43 that is normally located on the right side of the straight line L, and gradually rotates clockwise in FIG. Immediately before the end of the closing operation, as shown in FIG. 6, the required angle α (angle β with respect to the vertical line R passing through the drive shaft 23) is overrun from the straight line L to the opposite side of the rotation center O. It is provided as follows. In addition, although the angle β is shown as about 10 ° in FIG. 6, the present invention is not limited to this, and the point may be overrun to the left of the straight line L.

  In addition, the link 43 is stopped when the lock cam 16 and the motor cam 42 are unlocked after the motor cam 42 overruns on the opposite side of the rotation center O from the straight line L just before the closing operation is finished. It has a stopper portion 46 that restricts displacement (rotation or linear movement) in the direction. The stopper portion 46 includes first and second stopper portions 46A and 46B. The first stopper portion 46A is a lower portion of the side surface in the rotational direction (clockwise in FIGS. 4 to 6) during the closing operation of the link 43, and the motor cam 42 is overrun as shown in FIG. It is a side surface portion that is close to and faces the left side wall 50A of the groove 50 (FIG. 7) formed in the mounting plate 13 when run and stop. The second stopper portion 46B is provided at the lower end of the link 43. When the second stopper portion 46B enters the lower surface side of the mounting plate 13 through the hole 13a as shown in FIG. 6, the motor cam 42 faces the lower surface of the mounting plate 13. When trying to rotate in the direction, it contacts the lower surface and prevents further rotation. As the second stopper portion 46B, as shown in FIG. 7, an example in which the second stopper portion 46B is formed of a bent piece bent substantially at a right angle to the front side of the centrifuge 30 is shown, but not limited thereto, a pin, a set screw Etc. The hole 13a of the mounting plate 13 and the groove 50 communicate with each other.

  The reason why the first stopper portion 46A is provided is that when the link 43 further rotates in the unlocking direction (FIG. 6, clockwise) after the motor cam 42 has overrun and stopped, the second stopper portion 46A is provided. This is to prevent the motor cam 42 from pivoting significantly in the clockwise direction if the time until the 46B comes into contact with the lower surface of the mounting plate 13 is long. Therefore, when the groove 50 is formed short and the motor cam 42 overruns and stops, the first stopper portion 46A is opposed to the left side wall 50A of the groove 50 and the motor cam 42 tries to rotate clockwise. When this occurs, the first stopper portion 46A contacts the left side wall 50A to prevent the link 43 from rotating clockwise.

  The mounting plate 13 is provided with two hook sensors 26 that respectively detect the hooks 11A and 11B of the lid 3 when the lid is closed, and lid opening / closing sensors 27 (27A and 27B) that detect the lock cam 16B.

  In the lid lock device 31 having such a structure, the two lock cams 16A and 16B are held in a state in which they are inclined at the maximum angle to the right as shown in FIG. The joint portion 24 is retracted outside the lift area of the hooks 11A and 11B of the lid 3. The drive motor 18 is stopped because the hook sensor 26 does not detect the hooks 11A and 11B of the lid 3 and the lid opening / closing sensor 27A detects the lock cam 16B. The first connection pin 44 of the rotation transmission mechanism 32 is located above the drive shaft 23. The second connecting pin 45 is located on the upper left side with respect to the rotation center O of the lock cam 16A.

  In this state, when the lid 3 is closed to start the centrifugal separation operation, the lid 3 is pushed down by hand and placed on the seal member 8. When the lid 3 is closed, the hooks 11 </ b> A and 11 </ b> B are inserted into the housing 2 and the insertion is detected by the hook sensor 26. When the hook sensor 26 detects the hooks 11A and 11B, the detection signal is sent to the control unit. When the control unit receives the detection signal from the hook sensor 26, it sends a drive signal to drive the drive motor 18 and starts the locking operation of the lid 3 by the lid locking device 31. That is, when the drive motor 18 is driven, the rotation is decelerated by the speed reducer 19 and the drive shaft 23 is rotated. The rotation direction of the drive shaft 23 is clockwise in FIGS. When the drive shaft 23 rotates clockwise, the motor cam 42 rotates together with the drive shaft 23 clockwise.

  In this case, in the present embodiment, the rotation speed of the lock cams 16A and 16B is reduced by about 40% by the rotation transmission mechanism 32 from the rotation speed of the drive shaft 23 of the drive motor 18 with the speed reducer 19. As described above, when the rotational speeds of the lock cams 16A and 16B are decelerated and transmitted to the lock cam 16, a drive motor with a reduction gear having a small torque can be employed as a drive source.

  When the motor cam 42 rotates in the clockwise direction, the first connecting pin 44 is lowered, so that the link 43 is pulled obliquely downward to the right in FIG. 4 and gradually becomes vertical. For this reason, one lock cam 16A rotates counterclockwise about the shaft 36 as the center of rotation, and the engaging portion 24 gradually advances above the roller 10 provided on the left hook 11A. Thus, the roller 10 is gradually pushed down.

  Further, when one lock cam 16A rotates counterclockwise, this rotation is transmitted to the other lock cam 16B via the connecting plate 17, so that the other lock cam 16B also synchronizes with the one lock cam 16A in the same direction. The engaging portion 24 advances above the roller 10 provided on the right hook 11B, and the roller 10 is gradually pushed down by the cam surface 25. For this reason, the lid 3 is gradually pulled down to crush the seal member 8.

  Then, as shown in FIG. 5, when one lock cam 16 </ b> A rotates to a position where the lid 3 is locked, the roller 10 enters a substantially vertical state, and the roller 10 enters the vicinity of the inner bent portion 24 a of the engaging portion 24. In this state, the first connecting pin 44 is still located on the right side of the straight line L connecting the drive shaft 23 and the second connecting pin 45.

  Further, the motor cam 42 rotates and the drive shaft 23 and the first and second connecting pins 44 and 45 are positioned on a straight line and coincide with the straight line L. At this time, the roller 10 is closest to the inner bent portion 24a of the engaging portion 24 of the lock cam 16A.

  Then, as shown in FIG. 6, the motor cam 42 further rotates and overruns to the left of the straight line L connecting the drive shaft 23 and the second connecting pin 45, and the first connecting pin 44 reaches the lowest point position. When it exceeds, the lid opening / closing sensor 27B detects the lock cam 16B and sends a detection signal to the control unit. When receiving the detection signal from the lid opening / closing sensor 27B, the control unit stops the drive motor 18. When the motor cam 42 crosses the straight line L, the link 43 is slightly lifted upward, so that the lock cam 16A rotates clockwise by a small angle and returns to the state shown in FIG. Therefore, the roller 10 is separated from the inner bent portion 24a of the engaging portion 24 of the lock cam 16A. As a result, the lid 3 is locked in a completely closed state by the lid locking device 31 and the lid closing operation of the lid 3 is completed. In this locked state, the first stopper portion 46A of the link 43 is opposed to the left side wall 50A of the groove 50 of the mounting plate 13, and the second stopper portion 46B is located on the lower surface side of the mounting plate 13 from the hole 13a. It enters and faces the lower surface. Thereafter, the centrifuge 30 centrifuges the sample.

  When the centrifugation operation of the sample by the centrifuge 30 is completed, the operator operates the open button on the operation panel to take out the rotor or the sample tube attached to the rotor from the chamber. By this operation, the drive motor 18 is driven to rotate the drive shaft 23 in the unlocking direction (counterclockwise). As a result, the lock cam 16 rotates in the clockwise direction opposite to the above, and the engaging portion 24 is separated from the roller 10 of the hook 11 to release the lock of the lid 3. When the lock cam 16B rotates clockwise by a maximum angle as shown in FIG. 2, the lid opening / closing sensor 27B detects the lock cam 16B, and the control unit stops driving the drive motor 16 based on the detection signal.

  Thus, the lid locking device 31 according to the present invention is provided with the lock cam 16A and the drive motor 18 separated from each other, and the rotation of the drive shaft 23 of the speed reducer 19 is transmitted via the rotation transmission mechanism 32 including the motor cam 42 and the link 43. Since it is configured to transmit to the lock cam 16A, the rotational speed of the drive shaft 23 can be changed by changing the length of the motor cam 42 and the link 43 and the distance from the rotation center O of the lock cam 16A to the second connecting pin 45. The rotational speed of the lock cam 16 can be freely changed. Therefore, it is not necessary to match the rotation speed of the lock cam 16 required by the designer with the rotation speed of the drive shaft of the drive motor with a ready-made reducer, and the degree of freedom in designing the lid lock device 31 is expanded, and a ready-made inexpensive reducer is available. The attached drive motor can be used as it is.

  Further, by using the rotation transmission mechanism 32, the drive motor 18 can be mounted at a position separated from the lock cam 16A, so that the degree of freedom of the mounting position of the drive motor 18 is expanded, and the motor installation position can be set before and after the lock cam 16A. There is no need to secure space. In particular, if the drive motor 18 is attached so as to avoid a portion where the fragments are likely to scatter when the rotor is broken, the breakage of the drive motor 18 can be prevented more reliably.

Further, at the end of the closing operation, the motor cam 42 is overrun, the first stopper portion 46A provided on the link 43 is opposed to the left side wall 50A of the groove 50 of the mounting plate 13, and the second stopper portion 46B is Since the lower surface is entered from the hole 13a of the mounting plate 13, when an external force in the unlocking direction is applied to the lock cam 16 due to the destruction of the rotor, the motor cam 42 is caused by the first stopper portion 46A or the second stopper portion 46B. Further, the displacement of the link 43 in the unlocking direction can be reliably prevented.
When a force in the releasing direction is applied to the lock cam 16 due to the destruction of the rotor, (a) the drive motor 18 with the speed reducer 19 is not destroyed (b) the drive motor 18 with the speed reducer 19 is destroyed, but the drive shaft 23 (C) The case where the drive motor 18 with the reduction gear 19 and the drive shaft 23 are destroyed and the motor cam 42 is detached from the drive shaft 23 is considered.

  In the case of (a) above, when a force in the unlocking direction (FIG. 6, clockwise) is applied to the lock cam 16A and exceeds the gear and motor resistance of the drive motor 18 with the reducer 19, the lock cam 16A rotates clockwise. Then, the link 43 is lifted upward. Therefore, when the motor cam 42 tries to rotate in the clockwise direction, the first stopper portion 46A hits the left side wall 50A of the groove 50 to prevent the motor cam 42 from rotating. Therefore, the lock cam 16A cannot rotate and the locked state of the lid is not released.

  In the case of (b), since the drive motor 18 with the speed reducer 19 is broken, the motor cam 42 is released from the gear of the drive motor 18 with the speed reducer 19 and the resistance of the motor and can be easily rotated. Held in a state. When a force in the unlocking direction is applied to the lock cam 16A in this state, the lock cam 16A rotates in the clockwise direction and tries to pull the link 43 upward. Therefore, as in the case of (a) above, when the motor cam 42 tries to rotate clockwise, the first stopper portion 46A hits the left side wall 50A of the groove 50 to prevent the motor cam 42 from rotating. Therefore, the lock cam 16A cannot rotate and the locked state of the lid is not released.

  In the case of (c), the drive motor 18 with the speed reducer 19 is completely destroyed and the motor cam 42 is detached from the drive shaft 23 or the drive motor 18 falls on the mounting plate 13 and the drive shaft 23 moves. As a result, the motor cam 42 and the link 43 are pulled downward due to gravity or the mass of the motor, so that the first stopper portion 46A comes into contact with the left side wall 50A of the groove 50. In this state, when a force in the unlocking direction is applied to the lock cam 16A, the lock cam 16A rotates in the clockwise direction and tries to pull the link 43 upward. At this time, the link 43 does not press the first stopper portion 46 </ b> A against the left side wall 50 </ b> A of the groove 50. However, when the link 43 is going to rise, the second stopper portion 46B comes into contact with the lower surface of the mounting plate 13 and prevents the link 43 from moving upward. Therefore, the lock cam 16A cannot rotate and the locked state of the lid is not released.

Thus, since there is no such thing as the lid 3 is open when unlocked in either case, there is no fear that fractured pieces of the rotor is scattered jumps to the outside of the housing, the safety of the centrifuge 30 Can be improved.

  In the above-described embodiment, the example applied to the lid locking device 31 of the medium-sized centrifuge 30 in which the lid 3 is provided with the two hooks 11 has been described, but the present invention is not limited to this. However, the present invention can also be applied to a small centrifuge or a large centrifuge. In that case, since a small centrifuge generally has one hook 11 on its lid, one lock cam 16, one drive motor 18 with a speed reducer 19, and a rotation transmission mechanism 32 that connects them. What is necessary is just to comprise a lid | cover locking device. On the other hand, in the case of a large-scale centrifuge, since the lid itself is large and heavy, a large locking force is required. Therefore, two locking cams 16 that operate independently and these locking cams 16 are provided. The lid lock device may be configured by the two drive motors 18 with a reduction gear and the two rotation transmission mechanisms 32 respectively connecting the corresponding lock cam 16 and the drive shaft 23 of the drive motor 18 with the reduction gear 19.

  Further, in the above-described embodiment, the example in which the stopper portion 46 of the link 43 is configured by the first and second stopper portions 46A and 46B is shown, but the present invention is not limited to this, The first stopper portion 46A may be omitted, and the second stopper portion 46B may be used as the stopper portion.

It is a side view which fractures | ruptures and shows a part of state in the middle of closing the lid | cover of the centrifuge provided with the lid | cover lock apparatus which concerns on this invention. It is a front view which fractures | ruptures and shows a part of state in the middle of closing the lid | cover of a centrifuge. It is a front view which fractures | ruptures and shows a part of the state which closed the cover of the centrifuge completely. It is a figure which shows operation | movement of a rotation transmission mechanism. It is a figure which shows operation | movement of a rotation transmission mechanism. It is a figure which shows operation | movement of a rotation transmission mechanism. It is a bottom view which shows the stopper part of a link. It is a side view which fractures | ruptures and shows a part of state in the middle of closing the lid | cover of the conventional centrifuge. It is a front view which fractures | ruptures and shows a part of state in the middle of closing the lid | cover of a centrifuge. It is a front view which fractures | ruptures and shows a part of state at the time of lid closing of a centrifuge. It is a side view of a drive motor with a reduction gear and a lock cam.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Centrifugal separator, 2 ... Housing | casing, 3 ... Cover, 11, 11A, 11B ... Hook (engagement element), 13 ... Mounting plate, 16, 16A, 16B ... Lock cam, 17 ... Connecting member, 18 ... Drive motor, DESCRIPTION OF SYMBOLS 19 ... Reducer, 23 ... Drive shaft, 30 ... Centrifuge, 31 ... Lid lock device, 32 ... Rotation transmission mechanism, 42 ... Motor cam, 43 ... Link, 44 ... First connection pin, 45 ... Second connection Pin, 46 ... stopper part.

Claims (2)

In the lid lock device of the centrifuge that locks the openable / closable lid that closes the opening of the housing when the lid is closed,
A drive motor with a speed reducer provided in the housing, a lock cam that engages with an engaging member provided on the lid by being rotated by the drive motor with a speed reducer when the lid is closed, and A rotation transmission mechanism for transmitting the rotation of the drive shaft of the drive motor with a reduction gear to the lock cam;
The rotation transmission mechanism is constituted by a motor cam attached to the drive shaft, and a link connecting the motor cam and the lock cam ,
One end of the link is rotatably connected to the free end of the motor cam by a first connecting pin,
The other end of the link is rotatably connected to the lock cam by a second connecting pin,
The motor cam overruns on the opposite side of the rotation center of the lock cam across a straight line connecting the drive shaft and the second connecting pin immediately before the end of the closing operation,
The link includes a further lock cam after the motor cam overruns and stops, and a stopper portion that limits displacement of the motor cam in the unlocking direction,
The stopper locking device for a centrifuge according to claim 1, wherein the stopper part is configured to abut against a part of the casing to limit displacement in a lock releasing direction of the link . The lid locking device of the centrifuge according to claim 1,
A lid opening / closing sensor for detecting the lock cam ;
The lid opening / closing sensor detects the lock cam when the motor cam overruns, and stops the drive motor with a speed reducer according to the detection signal.

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