阅读说明：本技术 X射线摄像装置 (X-ray imaging apparatus ) 是由 早川徹 于 2018-11-05 设计创作，主要内容包括：在缆绳(55)断开的情况下,缆绳(55)会从以预定的张力拉伸的状态产生松弛。在此时,销(71)在弹簧(73)的施力的作用下被向移动支柱(42)侧推压,销(71)的顶端与移动支柱(42)的表面抵接。然后,支承臂(43)相对于移动支柱(42)相对地升降,在销(71)配置于与在移动支柱(42)的表面形成的孔部(65)相对的位置时,销(71)的顶端会进入孔部(65)内,从而使销(71)与孔部(65)卡合。由此,将支承臂(43)相对于移动支柱(42)固定。(When the cable (55) is broken, the cable (55) is loosened from a state stretched with a predetermined tension. At this time, the pin (71) is pressed toward the movable support column (42) by the urging force of the spring (73), and the tip of the pin (71) abuts against the surface of the movable support column (42). Then, the support arm (43) is relatively lifted relative to the movable support (42), and when the pin (71) is disposed at a position facing a hole (65) formed in the surface of the movable support (42), the tip of the pin (71) enters the hole (65), and the pin (71) engages with the hole (65). Thereby, the support arm (43) is fixed relative to the movable support column (42).)

1. An X-ray imaging apparatus is characterized in that,

the X-ray imaging device is provided with:

a support member that supports the X-ray tube or the X-ray detector; and

a pair of cables for suspending and supporting the support member,

in the X-ray imaging apparatus,

the support member is provided with a pair of engagement mechanisms corresponding to the pair of cables, the engagement mechanisms including: an engaging member that is movable between an engaging position at which the engaging member is engageable with a hole formed in a fixed-side member and a separating position at which the engaging member is separated from the hole; and a biasing unit that biases the engaging member toward the engaging position,

the engaging member of the engaging mechanism is disposed at the separated position against the urging force of the urging unit by coming into contact with the cable.

2. The X-ray imaging apparatus according to claim 1,

one end of the cable is fixed to the support member, wound around a pulley, and the other end is fixed to the fixed-side member.

3. The X-ray imaging apparatus according to claim 1 or 2,

the engaging member is a pin having a recess capable of accommodating the cable and abutting against the cable at a bottom surface of the recess.

4. An X-ray imaging apparatus is characterized in that,

the X-ray imaging device is provided with:

a pillar;

a support arm which is arranged to be able to move up and down with respect to the support column and supports the X-ray tube;

a pulley disposed on an upper portion of the pillar; and

a pair of cables, one end of each of which is fixed to the support arm, wound around the pulley, and the other end of each of which is fixed to the stay,

in the X-ray imaging apparatus,

a pair of engaging mechanisms are provided in the support arm in correspondence with the pair of cables, the engaging mechanisms including: an engaging member that is movable between an engaging position at which the engaging member is engageable with a hole formed in the pillar and a separating position at which the engaging member is separated from the hole; and a biasing unit that biases the engaging member toward the engaging position,

the engaging member of the engaging mechanism is disposed at the separated position against the urging force of the urging unit by coming into contact with the cable.

5. The X-ray imaging apparatus according to claim 4,

the X-ray imaging device is provided with:

a 2 nd support column that supports the support column so as to be able to ascend and descend;

a 2 nd pulley disposed on an upper portion of the 2 nd strut; and

a pair of 2 nd cables, one end of each of the pair of 2 nd cables being fixed to the column, wound around the 2 nd pulley, and the other end thereof being fixed to the 2 nd column,

a pair of 2 nd engaging mechanisms are provided in the strut so as to correspond to the pair of 2 nd cables, the 2 nd engaging mechanism including: a 2 nd engaging member movable between an engaging position engageable with a hole formed in the 2 nd support column and a separating position separated from the hole; and a 2 nd urging unit that urges the 2 nd engaging member toward the engaging position,

the 2 nd engaging member of the 2 nd engaging mechanism is disposed at the separated position against the biasing force of the 2 nd biasing unit by abutting against the 2 nd cable.

Technical Field

The present invention relates to an X-ray imaging apparatus for suspending and supporting an X-ray tube or an X-ray detector by a cable.

Background

As such an X-ray imaging apparatus, a mobile X-ray imaging apparatus that performs X-ray imaging by moving between wards is used. The mobile X-ray imaging device is provided with: a main body having front and rear wheels; a pillar erected on the main body; a support arm that moves up and down along the support column or rotates around the support column while supporting an X-ray irradiation unit formed by an X-ray tube and a collimator; an X-ray detector that detects X-rays that are irradiated from the X-ray irradiation section and that have passed through the subject; and a battery disposed inside the main body.

In such a mobile X-ray imaging apparatus, it is necessary to move an X-ray irradiation unit formed by an X-ray tube and a collimator up and down together with the support arm according to the imaging situation. The lifting mechanism of the supporting arm comprises: a pulley disposed on the upper part of the pillar; and a cable having one end fixed to the support arm, wound around the pulley, and the other end fixed to the support post, and configured to suspend and support the support arm by the cable.

In such a mobile X-ray imaging apparatus, there is a risk that the support arm falls down together with the X-ray tube and the collimator due to breakage of the cable. Therefore, conventionally, as a safety mechanism for the disconnection of the cable, in order to prevent the drop of the support arm and the like even when the cable is disconnected, there has been proposed an X-ray imaging apparatus including a mechanical stopper mechanism that stops the support arm at a position where the cable is disconnected (see patent documents 1 and 2).

Disclosure of Invention

Problems to be solved by the invention

In the case of using a mechanism for preventing the drop of a support arm or the like for supporting the X-ray tube and the collimator by a mechanical stopper mechanism, depending on the stop position of the support arm, there is a possibility that the subsequent recovery operation may become an obstacle. For example, when the support arm is stopped at a high position, there is a problem that the center of gravity is high, which makes the support arm unstable when moving, and the support arm cannot pass through a region where the height is limited, such as a door. Further, even when the support arm is pivoted sideways and stopped at a low position from which the support arm cannot be pivoted, there is a problem that the area in the width direction occupied by the device is large, and the support arm cannot pass through an area limited in width such as a door, and the support arm may be disposed in front of the operation area of the device and cannot be operated depending on the posture of the support arm.

To eliminate such a problem, it is considered to adopt the following structure: the pair of cables are used, so that even if one cable is broken, the support arm can be hung and supported by the other cable, thereby preventing the support arm from falling. In the case of such a configuration, an operator checks the state of the pair of cables in a routine inspection, and if there is a damage or a break, the operator needs to stop the use of the device and repair the device.

However, even in the case of such a configuration, if sufficient inspection is not performed and the cable is continuously used in a state where one cable is disconnected, the other cable may be disconnected and the support arm or the like may fall down.

Therefore, it is conceivable to provide a breakage detection mechanism including a sensor such as a microswitch to each of the pair of cables, and electrically stop the mechanical operation when any one of the pair of cables is broken. However, when such a configuration is adopted, the configuration is complicated by the sensor and its wiring, and not only the cost of the apparatus increases, but also the control system thereof becomes complicated.

Such a problem is not limited to the case where the X-ray tube and the collimator are raised and lowered in the mobile X-ray imaging apparatus, but is similarly generated when the X-ray tube and the collimator are raised and lowered in the X-ray imaging apparatus that performs normal imaging, or when the X-ray detector such as the flat panel detector is raised and lowered in the apparatus such as the vertical imaging table.

The present invention has been made to solve the above-described problems, and an object thereof is to provide an X-ray imaging apparatus capable of suspending and supporting an X-ray tube or an X-ray detector using a pair of cables, and stopping a support member at an appropriate position when the cables are disconnected.

Means for solving the problems

The invention described in claim 1 is an X-ray imaging apparatus including: a support member that supports the X-ray tube or the X-ray detector; and a pair of cables that support the support member in a suspended manner, wherein a pair of engagement mechanisms are provided on the support member in correspondence with the pair of cables, the engagement mechanisms including: an engaging member that is movable between an engaging position at which the engaging member is engageable with a hole formed in a fixed-side member and a separating position at which the engaging member is separated from the hole; and a biasing unit that biases the engaging member toward the engaging position, wherein the engaging member of the engaging mechanism is disposed at the disengaging position against the biasing force of the biasing unit by coming into contact with the cable.

The invention described in claim 2 is the invention described in claim 1, wherein one end of the cable is fixed to the support member, is wound around a pulley, and has the other end fixed to the fixed-side member.

In the invention described in claim 3, in the invention described in claim 1 or claim 2, the engaging member is a pin that includes a recess capable of accommodating the cable and that abuts against the cable at a bottom surface of the recess.

The invention described in claim 4 is an X-ray imaging apparatus including: a pillar; a support arm that is arranged to be able to move up and down with respect to the support column and supports the X-ray tube; a pulley disposed on an upper portion of the pillar; and a pair of cables having one end fixed to the support arm, wound around the pulley, and having the other end fixed to the support post, wherein a pair of engaging mechanisms are provided in the support arm in correspondence with the pair of cables, the engaging mechanisms including: an engaging member that is movable between an engaging position at which the engaging member is engageable with a hole formed in the pillar and a separating position at which the engaging member is separated from the hole; and a biasing unit that biases the engaging member toward the engaging position, wherein the engaging member of the engaging mechanism is disposed at the disengaging position against the biasing force of the biasing unit by coming into contact with the cable.

The invention described in claim 5 is the invention described in claim 4, wherein the X-ray imaging apparatus includes: a 2 nd support column that supports the support column so as to be able to ascend and descend; a 2 nd pulley disposed on an upper portion of the 2 nd strut; and a pair of 2 nd cables, one end of each of the pair of 2 nd cables being fixed to the support column, wound around the 2 nd pulley, and the other end of each of the pair of 2 nd cables being fixed to the 2 nd support column, wherein the support column is provided with a pair of 2 nd engaging mechanisms corresponding to the pair of 2 nd cables, the 2 nd engaging mechanism including: a 2 nd engaging member movable between an engaging position engageable with a hole formed in the 2 nd support column and a separating position separated from the hole; and a 2 nd urging means for urging the 2 nd engaging member toward the engaging position, wherein the 2 nd engaging member of the 2 nd engaging mechanism is disposed at the disengaging position against the urging force of the 2 nd urging means by coming into contact with the 2 nd cable.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the invention described in claim 1, the engagement mechanism can engage the engagement member with the hole formed in the fixed-side member when the cable is disconnected, thereby stopping the lifting of the support member. Therefore, by setting the position of the hole formed in the fixed-side member to an appropriate position, the support member can be safely stopped at the appropriate position even when the cable is disconnected.

According to the invention described in claim 2, in the lifting mechanism using the pulley, the support member can be safely stopped at an appropriate position.

According to the invention described in claim 3, when the wire is not disconnected, the engaging member can be reliably arranged at the separated position by housing the wire in the recess.

According to the invention described in claim 4, the engagement mechanism is configured to engage the engagement member with the hole formed in the stay when the cable is disconnected, thereby stopping the lifting of the support arm. Therefore, by setting the position of the hole formed in the stay to an appropriate position, the support arm can be safely stopped at an appropriate position even when the cable is broken.

According to the invention described in claim 5, even when the support arm is raised and lowered in two stages using the strut and the 2 nd strut, the strut can be safely stopped at an appropriate position when the 2 nd cable is disconnected.

Drawings

Fig. 1 is a perspective view of an X-ray imaging apparatus according to embodiment 1 of the present invention.

Fig. 2 is a perspective view of an X-ray imaging apparatus according to embodiment 1 of the present invention.

Fig. 3 is a perspective view of an X-ray imaging apparatus according to embodiment 1 of the present invention.

Fig. 4 is a side schematic view of the fixed stay 41, the moving stay 42, and the support arm 43.

Fig. 5 is a schematic side view for explaining the elevating operation of the movable support column 42 and the support arm 43.

Fig. 6 is an enlarged perspective view of the vicinity of the stopper mechanism 61.

Fig. 7 is an enlarged perspective view of the vicinity of the stopper mechanism 61.

Fig. 8 is a schematic side view of an X-ray imaging apparatus according to embodiment 2 of the present invention.

Fig. 9 is a side partially enlarged view of the X-ray imaging apparatus according to embodiment 2 of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 to 3 are perspective views of an X-ray imaging apparatus according to embodiment 1 of the present invention. Fig. 1 shows a state in which the support arm 43 is disposed at a fixed position, which is a position to be disposed when the X-ray imaging apparatus is moved, fig. 2 shows a state in which the support arm 43 is disposed at an elevated position elevated from the fixed position, and fig. 3 shows a state in which the support arm 43 is disposed at an elevation stop position, which is a position to be disposed when the cables 53 and 55, which will be described later, are disconnected.

This X-ray imaging apparatus is also called a visiting X-ray imaging apparatus, and moves between a plurality of wards to perform X-ray examination in each ward. The X-ray imaging device is provided with: the vehicle includes a bogie 10, a pair of left and right front wheels 11, which are direction changing wheels disposed on the front side in the traveling direction of the bogie 10, and a pair of left and right rear wheels 12, which are driving wheels disposed on the rear side in the traveling direction of the bogie 10. The rear wheel 12 is rotated by driving a motor provided in the cart 10.

A fixed support 41 constituting the 2 nd support of the present invention is provided upright on the forward side in the traveling direction of the carriage 10, and a movable support 42 and a support arm 43 constituting the support of the present invention are arranged on the fixed support 41 in a liftable state. The support arm 43 has a substantially L-shape in side view, and an X-ray irradiation unit formed by an X-ray tube 44 and a collimator 45 is disposed at the distal end thereof. The X-ray tube 44 and the collimator 45 move up and down in accordance with the up-and-down operation of the movable support 42 and the support arm 43. The fixed support 41 is supported to be rotatable about a vertical axis, and the X-ray tube 44 and the collimator 45 rotate together with the support arm 43 in accordance with the rotation of the fixed support 41.

A pin 23 is disposed on the lower surface of the support arm 43. In addition, a locking portion 24 called an arm fixing member is disposed on the carriage 10. In a state where the support arm 43 is arranged at the fixed position shown in fig. 1, the lower surface of the support arm 43 abuts against the lock portion 24. In this state, the pin 23 disposed on the lower surface of the support arm 43 is accommodated in a hole (not shown) formed in the lock portion 24.

The carriage 10 is provided with: an operation handle 21 for operating a traveling direction of the device; and an unillustrated housing unit that houses an X-ray detector (not shown) such as a flat panel detector for detecting X-rays that are emitted from the X-ray tube 44 and that pass through the subject.

Fig. 4 is a side schematic view of the fixed stay 41, the moving stay 42, and the support arm 43. Fig. 5 is a schematic side view for explaining the operation of raising and lowering the movable support column 42 and the support arm 43.

The movable support column 42 is movable up and down along the fixed support column 41 by a guide member, not shown, disposed on the fixed support column 41. The support arm 43 is movable up and down along the movable column 42 together with the X-ray tube 44 and the collimator 45 by a guide member, not shown, disposed on the movable column 42.

The take-up pulley 52 connected to a lift assist mechanism including a spring or the like is rotatably disposed on the upper portion of the fixed support 41 about a shaft 56 fixed to the upper portion of the fixed support 41. The other end of the cable 53, one end of which is fixed to the winding pulley 52 and which is wound around the winding pulley 52, is fixed to the base portion 47 provided at the lower end portion of the movable support column 42. Therefore, the winding amount of the rope 53 wound around the winding pulley 52 is changed by rotating the winding pulley 52, and the movable support column 42 is moved up and down. The winding pulley 52 constitutes the 2 nd pulley of the present invention, and the rope 53 constitutes the 2 nd rope of the present invention.

On the other hand, the fixed pulley 31 as a pulley of the present invention is rotatably disposed on the upper portion of the movable support column 42 around the support shaft 32 fixed to the upper portion of the movable support column 42. One end of a cable 55 for raising and lowering support arm 43 wound around fixed sheave 31 is fixed to base 46 provided at the lower end of fixed stay 41, and the other end is fixed to base 48 provided at the lower end of support arm 43. Therefore, when the movable support 42 is raised by the cable 53 and the cable 55 is wound out toward the base 46, the support arm 43 is also raised with respect to the movable support 42. On the other hand, when the movable support 42 is lowered and the cable 55 is wound out toward the base 48, the support arm 43 is also lowered relative to the movable support 42.

Therefore, when the winding pulley 52 rotates to raise the movable support 42, as shown in fig. 5, the support arm 43 is raised 2 times the amount of raising of the movable support 42 together with the X-ray irradiation unit formed by the X-ray tube 44 and the collimator 45. When the winding pulley 52 rotates to lower the movable support 42, as shown in fig. 4, the support arm 43 is lowered 2 times the amount of lowering of the movable support 42 together with the X-ray irradiation unit formed by the X-ray tube 44 and the collimator 45.

A pair of the cables 53 and 55 are arranged in parallel with each other. A pair of the take-up pulley 52 and the fixed pulley 31 around which the cables 53 and 55 are wound are also disposed coaxially. Thus, even when one of the cables 53 and 55 is broken due to fatigue or the like, the other cable 53 or 55 can prevent the drop of the mobile stay 42 and the support arm 43. A stopper mechanism 61 and a stopper mechanism 62 are provided, and when one of the pair of cables 55 is disconnected, the stopper mechanism 61 safely stops the support arm 43 at an appropriate position, and when one of the pair of cables 53 is disconnected, the stopper mechanism 62 safely stops the moving support 42 at an appropriate position.

After moving strut 42 and support arm 43 are raised, support arm 43 is disposed at the raised position shown in fig. 2. In this state, when the fixed column 41 is rotated about the axis line oriented in the vertical direction with respect to the cart 10, the X-ray irradiation unit formed by the X-ray tube 44 and the collimator 45 rotates together with the support arm 43. Thus, the X-ray irradiation unit formed by the X-ray tube 44 and the collimator 45 can be disposed at a position suitable for X-ray imaging.

On the other hand, in a state where the movable stay 42 and the support arm 43 are lowered and the support arm 43 is disposed at the fixed position shown in fig. 1, the lower surface of the support arm 43 is in contact with the lock portion 24, and the pin 23 disposed on the lower surface of the support arm 43 is accommodated in the hole portion formed in the lock portion 24. In this state, the X-ray imaging apparatus can be moved between wards and the like.

Next, the structure of the stopper mechanisms 61 and 62, which are characteristic parts of the present invention, will be described. Fig. 6 and 7 are enlarged perspective views of the vicinity of the stopper mechanism 61. Here, fig. 6 shows a state in which the pair of pins 71 are disposed at the separated position, and fig. 7 shows a state in which one pin 71 of the pair of pins 71 is disposed at the engaged position. In the following description, the structure of the stopper mechanism 61 of the stopper mechanisms 61 and 62 shown in fig. 4 and 5 will be described, but the stopper mechanism 62 has the same structure as the stopper mechanism 61.

The stopper mechanism 61 includes: a support bracket 64 fixed to the support arm 43 as a support member, a pair of pins 71 disposed at positions facing the pair of cables 55 so as to be capable of reciprocating with respect to the support bracket 64, and a pair of springs 73 (see fig. 7) for biasing the pins 71. The pin 71 and the spring 73 constitute an engagement mechanism of the present invention disposed in correspondence with the pair of cables 55. Each pin 71 functions as an engagement member of the present invention, and a recess 72 capable of accommodating the cable 55 is formed at the tip end thereof. The cable 55 is fixed to the base 48 by a fitting metal 63.

Each pin 71 is movable between an engagement position where it enters a hole 65 formed in the surface of the movable support 42 functioning as the fixed-side member of the present invention and engages with the hole 65, and a disengagement position where it is disengaged from the hole 65. As shown in fig. 6, each pin 71 abuts against the cable 55 housed in the recess 72 at the bottom surface of the recess 72, and each pin 71 is disposed at a separated position against the biasing force of the spring 73.

In this state, when the cable 55 is broken due to fatigue or the like, the cable 55 is loosened from a state stretched with a predetermined tension. At this time, the pin 71 is pressed toward the movable support 42 by the biasing force of the spring 73, and the tip of the pin 71 abuts against the surface of the movable support 42. Then, when the support arm 43 is moved up and down relative to the movable support column 42 so that the pin 71 slides on the surface of the movable support column 42 and the pin 71 is disposed at a position facing the hole 65 formed in the surface of the movable support column 42, as shown in fig. 7, the tip end of the pin 71 enters the hole 65 and the pin 71 engages with the hole 65. Thereby, support arm 43 is fixed to moving stay 42. Therefore, by setting the position of hole 65 formed in the surface of movable stay 42 to an appropriate position, support arm 43 can be stopped at a height position suitable for the subsequent work.

In the stopper mechanism 62, the pin of the stopper mechanism 62 is engaged with the hole formed in the surface of the fixed support column 41, and the movable support column 42 can be fixed to the fixed support column 41 by the same structure as that shown in fig. 6 and 7. At this time, the support arm 43 and the movable support 42 are lifted and lowered in synchronization with each other, and if one is fixed, the other is also fixed. Therefore, by forming the hole in the surface of the fixed stay 41 at a position where the pin of the stopper mechanism 62 can be engaged with the hole formed in the surface of the fixed stay 41 at a height position where the pin 71 of the stopper mechanism 61 is engaged with the hole 65 formed in the surface of the movable stay 42, the support arm 43 and the movable stay 42 can be stopped at the same height position even when one of the cable 53 and the cable 55 is disconnected.

Fig. 3 shows the height position at which support arm 43 and mobile strut 42 stop when either of the pairs of cables 53, 55 is disconnected, with this structure. In this state, support arm 43 is disposed at a lower position in a range where pin 23 disposed on the lower surface of support arm 43 is not accommodated in the hole formed in lock portion 24. This makes it possible to lower the height of the entire device while keeping the center of gravity of the entire device low, and also to freely rotate the support arm 43 to a position suitable for the subsequent work because the pin 23 provided on the lower surface of the support arm 43 is not engaged with the lock portion 24.

Next, another embodiment of the present invention will be explained. Fig. 8 is a schematic side view of an X-ray imaging apparatus according to embodiment 2 of the present invention. Fig. 9 is an enlarged side view of the X-ray imaging apparatus according to embodiment 2 of the present invention.

This X-ray imaging apparatus is also called a vertical imaging table, and includes an X-ray detector 82 such as a flat panel detector that detects X-rays that are irradiated from an X-ray irradiation unit formed by an X-ray tube 91 and a collimator 92 and that pass through a subject. The X-ray detector 82 is supported by a support block 83, and the X-ray detector 82 is movable up and down with respect to the main body 81 by a guide mechanism, not shown, disposed on the main body 81.

A fixed pulley 86 that rotates about a shaft 87 is disposed on the upper portion of the main body 81. A cable 84 having one end connected to the support block 83 and the other end connected to a counterweight 85 having a weight approximately equal to the weight of the X-ray detector 82 and the support block 83 is wound around the fixed pulley 86. This enables the X-ray detector 82 to be lifted and lowered together with the support block 83 with a small force by the operation of the operator.

A pair of the cables 84 are arranged in parallel to each other. A pair of fixed pulleys 86 around which the cables 84 are wound are also coaxially arranged. This can prevent the X-ray detector 82 and the weight 85 from falling even if the cable 84 is disconnected due to fatigue or the like. A stopper mechanism 69 is provided, and when one of the pair of cables 84 is disconnected, the stopper mechanism 69 safely stops the X-ray detector 82 at an appropriate position.

As shown in fig. 9, the stopper mechanism 69 includes a support bracket 64 fixed to a support block 83 as a support member, a pair of pins 71 disposed at positions facing the pair of cables 84 so as to be capable of reciprocating with respect to the support bracket 64, and a pair of springs (not shown) for biasing the pins 71. The pin 71 and the spring constitute an engagement mechanism of the present invention disposed in correspondence with the pair of cables 84. Each pin 71 functions as an engagement member of the present invention, and a recess capable of accommodating the cable 84 is formed at the tip end of each pin 71, as in the case of the embodiment shown in fig. 6 and 7.

Each pin 71 is movable between an engagement position where it enters a hole 89 formed in the surface of the main body 81 functioning as the fixed-side member of the present invention and engages with the hole 89, and a disengagement position where it is disengaged from the hole 89. Each pin 71 abuts against the cable 84 housed in the recess formed in each pin 71 at the bottom surface of the recess, and each pin 71 is disposed at a separate position against the biasing force of the spring.

In this state, when the cable 84 is broken due to fatigue or the like, the cable 84 is loosened from a state stretched with a predetermined tension. At this time, the pin 71 is pushed toward the main body 81 by the biasing force of the spring, and the tip of the pin 71 abuts against the surface of the main body 81. Then, the X-ray detector 82 moves up and down together with the support block 83 relative to the main body 81 so that the pin 71 slides on the surface of the main body 81, and when the pin 71 is disposed at a position facing the hole 89 formed in the surface of the main body 81, the tip end of the pin 71 enters the hole 89, and the pin 71 engages with the hole 89. Thereby, the X-ray detector 82 and the support block 83 are fixed to the main body 81. Therefore, by setting the position of the hole 89 formed in the surface of the main body 81 to an appropriate position, the X-ray detector 82 can be stopped at a height position suitable for the subsequent work.

Description of the reference numerals

10. A trolley; 11. a front wheel; 12. a rear wheel; 31. fixing the pulley; 41. fixing a strut; 42. moving the strut; 43. a support arm; 44. an X-ray tube; 45. a collimator; 52. a take-up pulley; 53. a cable; 55. a cable; 61. a stopper mechanism; 62. a stopper mechanism; 64. a support metal member; 65. a hole portion; 69. a stopper mechanism; 71. a pin; 72. a recess; 73. a spring; 81. a main body; 82. an X-ray detector; 83. a support block; 84. a cable; 89. a hole portion.