JP2660290B2 - Travel control mechanism of mobile X-ray device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a traveling control mechanism of a mobile X-ray apparatus.

[Conventional technology]

An X-ray device is loaded on a truck with a self-propelled traveling mechanism,
Movement X to go to the bedside of the patient and operate
Although a line device is known (Japanese Patent Application Laid-Open No. 61-208796), the requirements for this traveling vehicle are that it can travel at extremely low speeds, including forward and backward traveling, and that it has smooth maneuverability.
During operation, sufficient torque can be generated.

On the other hand, since this traveling cart is for medical use, the drive source is limited to an electric motor in consideration of quietness, cleanliness, etc., but when a DC motor is used (see
No. 4304) and when using an AC motor.
No. 4).

[Problems to be solved by the invention]

DC motors are used relatively frequently because they are easy to switch between forward and reverse (switching between forward and reverse in the direction of rotation), but have the problem of insufficient torque at low speeds. This point is not taken into consideration in the above-described prior art, and the problem of insufficient torque at low speeds has not been solved because the drive mechanism itself does not have a large deceleration function.

On the other hand, in the case of an AC motor, as shown in the above-mentioned prior art, a certain supplementary mechanism can be adopted, but a converter for exchanging DC to AC is required, and the device becomes complicated.

[Means for solving the problem]

Therefore, the present invention relates to a traveling control mechanism of a moving X-ray apparatus for transmitting the driving force of a DC motor to driving wheels via at least a differential planetary gear type continuously variable transmission, a clutch device and a brake device. In the drive circuit,
An open contact interlocked with a switch that is turned on by disconnection of the clutch device is connected in series with the open contact and a switch that is turned on by a forward / reverse operation of the vehicle speed grip for shifting the differential planetary gear type continuously variable transmission. The above-mentioned problem has been solved by providing a traveling control mechanism for a mobile X-ray apparatus, characterized in that a deadman switch that is connected in parallel to a circuit and that conducts when the brake device is released is provided in series. is there.

[Action]

By taking the above measures, a low speed near zero can be achieved by the differential planetary gear type continuously variable transmission, and the problem of insufficient torque can be solved by this mechanical deceleration. However, when this type of transmission is stopped during operation, it has the characteristic that the speed change operation is heavy and cannot be performed. It has sex. In order to solve this problem, the drive system is provided with a clutch device in addition to the transmission device so that the motor cannot be started unless the clutch device is disconnected. The bogie does not start even if the transmission is operated and the gear change operation is performed as long as the clutch device is disengaged.)

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a side view of the moving X-ray apparatus, in which the driving wheels 1
At the front of the self-propelled carriage 3 supported by the
And an X-ray device 5 is attached to the support 4. In addition, the self-propelled trolley 3 is further provided with an operation unit 6 for operating the trolley 3 itself, an operation display unit 7 for operating the X-ray apparatus 5 and displaying the operation.

FIG. 3 is a development view showing a drive system of the self-propelled carriage 3,
The driving force of the DC motor 8 is shifted by a differential planetary gear type continuously variable transmission 9, which in this embodiment is a slide mesh type clutch device.
It is intermittently transmitted at 10 and transmitted to the differential device 11. Differential device
Since the two output shafts 11 and the drive wheels 1 on both sides are connected by a chain mechanism 13 or the like, the driving force of the DC motor 8 is appropriately reduced and reaches the drive wheels 1 in a differential manner.

The differential planetary gear type continuously variable transmission 9 has an umbrella shape and an input circle connected to an input shaft 15 and an output shaft 16 on both sides of a planetary cone 14 arranged in a planetary shape on the circumference. The plate 17 and the output disk 18 are pressed against each other. And the planetary cone 14
The speed change ring 19 is slid in contact with the conical surface of the gear, and the speed is changed by moving the speed change ring 19. The value of the output rotation / input rotation increases as the speed change ring 19 is moved from the bottom of the planetary cone 14 to the top, and the output rotation at the bottom is almost zero. Further, in this embodiment, the speed change ring 19 is constantly repelled to the low speed side by a spring 20 or the like, and automatically shifts to the low speed side when not in operation.

The clutch device 10 of the slide mesh type includes a clutch gear 21 which is spline-fitted to the output shaft 16 or the like of the above-mentioned operation planetary gear type continuously variable transmission 9 and which can move in the axial direction, and a differential device.
The intermittent power is performed by connecting and disconnecting the meshing of the 11 input gears 22 by moving the clutch gear 21 in the axial direction.

In this drive system, a brake device 25 including a brake disk 23, a brake shoe 24, and the like is also provided on the output shaft 16 and the like of the differential planetary gear type continuously variable transmission 9.

FIG. 4 is a plan view showing the area around the rear part of the self-propelled carriage 3, and the cylindrical grips 26, 2 held by the operator's hands on both sides of the rear part.
7 is equipped, and one of them (right side in this example)
The grip 27 can be turned back and forth, and the switching of the advance and the vehicle speed are controlled by the direction of rotation and the amount of rotation.

FIG. 5 (a) is a cross-sectional view of the vehicle speed grip 27. A lever 29 to which an operation wire 28 for operating the speed change ring 19 of the above-described differential planetary gear type continuously variable transmission 9 is connected.
The lever 29 and the vehicle speed grip 27 are connected by a link 30. Therefore, the vehicle speed grip 27
Is rotated in either of the front and rear directions, the operation wire 28 is pulled, and the speed change ring 19 is shifted to the top side of the planetary cone 14 to increase the rotation of the output shaft 16.

FIG. 5 (b) is a cross-sectional view of the vehicle speed grip 27. The two limit switches LS2 and LS3 are operated such that the limit switch LS2 is operated by turning forward and the limit switch LS3 is operated by turning backward. To be arranged.

FIG. 6 is a side view showing the area around the rear part of the self-propelled carriage 3, in which a clutch lever 31 for operating the above-mentioned clutch device 10 is provided below the vehicle speed grippy 27. That is, if the clutch lever 31 is pulled upward, the movement is transmitted to the clutch gear 21 via the operation wire 32,
The power is cut off by disengaging the differential gear 11 from the input gear 22.
Power will be connected). The clutch lever 31
A limit switch LS4 that detects this movement is provided in the vicinity, and if the clutch lever 31 is set to the disengaged position,
It is supposed to work.

FIG. 7 is a cross-sectional view of the other grip 26. Below the grip 26, a brake lever 34 that rotates around a horizontal support shaft 33 is provided.
Of the brake shoe 24. That is, the arm integrated with the brake lever 34
If the brake shoe 34 is connected to the brake shoe 24 with the operation wire 36 and the brake lever 34 is gripped together with the grip 26 and pulled upward, the brake shoe 24 tightens the brake disk 23 and the brake is activated. . A deadman switch LS1 is provided near the brake lever 34 to detect the state when the brake lever 34 is pulled up.

FIG. 1 is an electric circuit diagram for controlling the above elements. First, when the brake lever 34 is released, the deadman switch LS1 is operated, and at this time, the clutch lever 31 is operated to the disengaged position. And limit switch LS
4 also operates, and current flows through coil R1 of relay R1. The open contact R1 of the relay R1 is provided as a gate for the circuit of the limit switches LS3 and LS4 which operate when the vehicle speed grip 27 is operated, in order to hold the limit switch LS4 by itself. Therefore, at this time, when one of the limit switches LS3 and LS4 is operated, the forward relay R
4, R5 or each coil R4, R5, R2, R3 of reverse relay R2, R3
Current to each other, and the required open contacts R4, R5, R
The pair of R2 and R3 is turned on to start the DC motor 8 in either the forward or reverse direction. Reference numeral 37 denotes a control circuit of the X-ray apparatus 5, in which the open contact R1 of the relay R1 is turned on.

As described above, when the brake device 25 is actuated or the DC motor 8 is stopped for some reason, the clutch device 31 is pulled up to disengage the clutch device 10 or the vehicle speed grip in order to restart and move forward and backward. If the vehicle speed grip 27 is too heavy to return, the clutch device 10 is disconnected and the differential planetary gear type continuously variable It is only necessary to operate the transmission ring 19 of the transmission 9 to operate the transmission at a low speed, so that sudden start or the like does not occur.

〔The invention's effect〕

As described above, the present invention uses the differential planetary gear type continuously variable transmission 9 capable of producing an output rotation close to zero, so that it can run at a very low speed and has a strong propulsive force at this time. Therefore, delicate steering suitable for operating X-rays at the patient's bedside or the like becomes possible.
Next, when the clutch device 10 is restarted after being stopped once due to engine stall or rising of the battery, the clutch device 10 may be disconnected once,
Unless the vehicle speed grip 27 is at the neutral zero speed position, the DC motor 8 does not rotate, so that the vehicle does not suddenly start and is safe. In this case, the clutch device 10
Is cut off, the vehicle speed grip 27 is rotated in either forward or backward direction to start the DC motor 8 (if this operation has already been performed before cutting, simultaneously with the cutting), and the differential planetary gear type stepless The transmission 9 is moved to move the transmission ring 19 to the lower speed side (this operation is also carried out by the presence of the spring 20), and the clutch device 10 is connected again. Therefore, the start is a slow soft start.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram for traveling control of an X-ray moving device, FIG.
FIG. 3 is a side view of the X-ray moving apparatus, FIG. 3 is a developed view showing a drive system, FIG. 4 is a plan view showing an operation unit, and FIGS. (Symbol) 1... Drive wheels 8... DC motor 9... Differential planetary gear type continuously variable transmission 10... Clutch device 25... Brake device 27... Vehicle speed grip LS1... Deadman switch LS2. …… 〃 LS4 …… 〃 R1 …… Switch open contact

Claims (1)

(57) [Claims] 1. The driving force of a DC motor (8) is at least
Differential planetary gear type continuously variable transmission (9), clutch device (1
0) and the drive wheels (1) via the braking device (25)
In the traveling control mechanism of the mobile X-ray device for transmitting to the DC motor (8), the drive circuit includes
Contact (R4) linked with the switch (LS4) that conducts when the
1) and the switches (LS2) and (LS3) that conduct through the open contact (R1) and the forward / backward operation of the differential planetary gear type continuously variable transmission (9) speed-changing vehicle speed grip (27). A travel control mechanism for a mobile X-ray apparatus, comprising: a deadman switch (LS1) that is connected in parallel to a circuit that is connected in series and that conducts when the brake device (25) is released.