Motor cooling device and component mounting device

Abstract

To cool a motor of a linear motion mechanism relatively quietly and with a rational configuration.SOLUTION: A Y-axis motor cooling device 20Y cools a Y-axis motor 15 of a linear motion mechanism that reciprocates a beam 13 (moving body) by the driving force of the Y-axis motor 15. The Y-axis motor cooling device 20Y is equipped with a pump portion 22 that includes a piston 24c (displacement portion) that can move in a direction parallel to the direction of reciprocation as the beam 13 reciprocates, and has a function of sucking in and storing air as the piston 24c moves in the Y1 direction (first direction) and a function of discharging the stored air as the piston 24c moves in the Y2 direction (second direction), and an air blower pipe 27 (guide portion) that guides the air discharged from the pump portion to the Y-axis motor 15.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a cooling device for cooling a motor of a linear motion mechanism including a moving body that reciprocates by motor drive, and a component mounting device including this cooling device.

Background Art

[0002] In a linear motion mechanism including a moving body that reciprocates by motor drive, the motor generates heat. The heat generation of the motor not only causes a decrease in the performance and lifespan of the motor itself, but also causes thermal deformation of each part in the vicinity of the motor. Therefore, when continuously and long-term driving, a cooling device for the motor may be incorporated.

[0003] For example, Patent Document 1 discloses a motor cooling device for cooling a mover of a linear motor in a component mounting device equipped with a linear motor. The linear motor is a drive source for moving a component mounting head unit and a beam (head unit support part) that supports this head unit. The mover of the linear motor consists of an armature equipped with a plurality of coils, and generates heat when energized. The motor cooling device includes an electric fan fixedly arranged at a position where the mover stays relatively for a long time, and when the mover is at the staying position, the mover is intensively cooled by the electric fan.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the case of the conventional motor cooling device as described above, in addition to the need for a large amount of power for motor cooling, the driving noise of the electric fan may become noise.

[0006] This invention has been made in view of the above circumstances, and aims to provide a technology that enables relatively quiet and rational cooling of a motor in a linear motion mechanism equipped with a moving body that moves back and forth by motor drive. [Means for solving the problem]

[0007] A motor cooling device according to one aspect of the present invention is a motor cooling device for cooling a motor in a linear motion mechanism comprising a motor and a movable body that reciprocates by the driving force of the motor, wherein, when one of the reciprocating directions of the movable body is a first direction and the other is a second direction, the device includes a pump unit that includes a displacement part that can move in a direction parallel to the reciprocating direction as the movable body reciprocates, and has the function of drawing in and storing air as the displacement part moves in the first direction, and discharging the stored air as the displacement part moves in the second direction, and a guide unit that guides the air discharged from the pump unit to the motor. The pump section consists of a bellows tube that is expandable and contractible in the direction of the reciprocating movement, and at least one end of the bellows tube on the second direction side is fixed to a non-movable portion, the displacement portion is the end of the bellows tube on the first direction side, and the bellows tube is configured to be elastically expandable and contractible so that it is kept in an extended state when no external force is applied in the second direction, by leaving the end on the first direction side free, and the moving body has a contact portion that abuts against the end of the bellows tube on the first direction side as it moves in the second direction and compresses the bellows tube. It is characterized by the following.

[0008] In this motor cooling device, as the moving body reciprocates, the displacement unit moves in a first direction, causing the pump unit to draw in and store air. Conversely, when the displacement unit moves in a second direction, the stored air is discharged from the pump unit and guided to the motor by the guide unit. This cools the motor. In other words, the motor cooling device cools the motor using the reciprocating motion of the moving body. Therefore, there is no power consumption solely for motor cooling. Also, since an electric fan is not used, no noise is generated by fan operation. Consequently, the above motor cooling device makes it possible to cool the motor in a relatively quiet and rational configuration. In this particular configuration, when the moving body moves in the second direction, the moving body (contact part) comes into contact with the end of the pump body on the first direction side, compressing the pump body. Conversely, when the moving body moves in the first direction, the pump body expands by its own elasticity (self-recovers) as a result of this movement. In other words, it is possible to expand the pump body without using the power of the moving body, or in other words, without putting a load on the moving body.

[0009] More specifically, the pump unit comprises a pump body that generates negative pressure inside when the displacement unit moves in a first direction, a first check valve that opens due to the negative pressure and allows air to be drawn into the pump body, and a second check valve that opens when the air inside the pump body is compressed as the displacement unit moves in a second direction and allows air to be discharged from the pump body, and the guide unit guides the air discharged through the second check valve to the motor.

[0010] In other words, when the displacement part moves in the first direction, negative pressure is generated inside the pump body, causing the first check valve to open. This opening draws air into the pump and stores it. Conversely, when the displacement part moves in the second direction, the first check valve closes, compressing the air inside the pump body. This increase in air pressure due to compression causes the second check valve to open, releasing the air from the pump body. This configuration realizes the functions of drawing in and storing air and discharging the stored air as the moving body reciprocates.

[0019] In the motor cooling device described above, the motor is a linear motor comprising an armature and a movable element provided on the moving body side, and a stator made of a field, and the guide section may be configured to guide the air discharged from the pump section to the movable element.

[0020] This configuration makes it possible to cool the movable element, which is the heat-generating part of the linear motor, by utilizing the reciprocating motion of the moving body.

[0021] On the other hand, a component mounting apparatus according to one aspect of the present invention is a component mounting apparatus comprising a motor, a movable body that reciprocates by the driving force of the motor, and a mounting head provided on the movable body, characterized in that it is equipped with the above-described motor cooling device as a motor cooling device for cooling the motor.

[0022] This configuration allows for efficient cooling of the motor in a component mounting device by utilizing the reciprocating movement of the moving body used to move the mounting head.

[0023] In this case, it is preferable that the component mounting device includes a casing that forms the outer shell of the device and partitions the inside and outside of the device, and the pump unit of the motor cooling device is configured to suck and store the air outside the casing.

[0024] According to this configuration, it becomes possible to cool the motor with the relatively low-temperature air outside the machine. Therefore, it contributes to an improvement in the cooling efficiency of the motor.

Advantages of the Invention

[0025] According to the present invention described above, it is possible to cool the motor of the linear motion mechanism provided with a moving body that reciprocates by driving the motor in a relatively quiet and reasonable configuration.

Brief Description of the Drawings

[0026] [Figure 1] It is a plan view of a component mounting device according to a first embodiment of the present invention. [Figure 2] It is a front view of the component mounting device. [Figure 3] It is a schematic diagram of a motor cooling device. [Figure 4] It is an operation explanatory view of the motor cooling device. [Figure 5] It is a plan view of a component mounting device according to a second embodiment of the present invention. [Figure 6] It is a front view of the component mounting device. [Figure 7] It is a schematic diagram of a motor cooling device. [Figure 8] It is an operation explanatory view of the motor cooling device. [Figure 9] It is a schematic diagram of a main part of a component mounting device according to a third embodiment of the present invention. [Figure 10] It is a schematic diagram of a main part of a component mounting device according to a fourth embodiment of the present invention. [Figure 11] It is an operation explanatory view of a motor cooling device.

Modes for Carrying Out the Invention

[0027] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0028] [First Embodiment] Figure 1 is a plan view of the component mounting apparatus 1 according to the present invention, and Figure 2 is a front view of the component mounting apparatus 1 as seen from the Y2 side.

[0029] The component mounting apparatus 1 is equipment that produces component-mounted circuit boards, on which electronic components are mounted on a substrate P such as a printed circuit board. Each figure shows the X and Y coordinate axes. The X direction is parallel to the horizontal plane, and the Y direction is perpendicular to the X direction on the horizontal plane. The directions perpendicular to the X and Y directions are the up and down directions.

[0030] The component mounting device 1 comprises a base 2 which is the device frame, a substrate transport unit 3 which transports substrates P on the base 2, a component supply unit 5, a head unit 6 which moves in the space above the base 2, and a component recognition camera 7.

[0031] The substrate transport unit 3 is equipped with a pair of conveyors 4 that transport the substrate P in the X direction. The conveyors 4 are belt conveyors. The substrate transport unit 3 receives the substrate P from the right side (X1 side) of Figure 1 and transports it to the work position (the position of the substrate P shown in the figure), and after the mounting work is completed, it transports the substrate P from the work position to the left side (X2 side) of the figure. Although not shown in the figure, the work position is equipped with a substrate holding mechanism that holds the substrate P in a positioned state.

[0032] The component supply unit 5 is provided on both sides of the substrate transport unit 3 in the Y direction. The component supply unit 5 is equipped with feeders for supplying components. In this example, multiple tape feeders 5F are arranged in parallel along the conveyor 4. The tape feeders 5F use ribbon-shaped tape as a carrier to supply small pieces of electronic components. The component supply unit 5 may also be equipped with feeders other than tape feeders 5F, such as stick feeders that supply electronic components through the inside of a cylindrical stick, or tray feeders that supply electronic components placed on a tray.

[0033] The head unit 6 is a unit component that takes components from the component supply unit 5 and mounts (mounts) them onto the circuit board P. The head unit 6 moves horizontally (in the X and Y directions) by the operation of the head unit drive mechanism 8.

[0034] The head unit drive mechanism 8 is based on a plurality of linear motion mechanisms. Specifically, the head unit drive mechanism 8 includes fixed rails 12 each fixed to a pair of elevated frames 11 extending in the Y direction and provided on a base 2, a beam 13 extending in the X direction and supported movably on the fixed rails 12 via sliders, and a ball screw shaft 14 screwed into the beam 13 and rotationally driven by a Y-axis motor 15. The head unit drive mechanism 8 also includes a fixed rail 16 fixed to the beam 13 and supporting the head unit 6 so as to be movable in the X direction, and a ball screw shaft 17 screwed into the head unit 6 and rotationally driven by an X-axis motor 18. In other words, the head unit drive mechanism 8 moves the head unit 6 back and forth in the X direction via the ball screw shaft 17 by the X-axis motor 18, and moves the beam 13 back and forth in the Y direction via the ball screw shaft 14 by the Y-axis motor 15. With this configuration, the head unit drive mechanism 8 moves the head unit 6 in the X and Y directions within a certain range of space above the base 2.

[0035] As described above, in this example, the beam 13 reciprocates along the fixed rail 12 in the Y direction due to the driving force of the Y-axis motor 15, and the head unit 6 reciprocates along the fixed rail 16 in the X direction due to the driving force of the fixed rail 16. Therefore, the mechanism including the pair of fixed rails 12, the beam 13 (moving body), the ball screw shaft 14 and the Y-axis motor 15, and the mechanism including the fixed rail 16, the ball screw shaft 17, the head unit 6 (moving body) and the X-axis motor 18 each correspond to the "linear motion mechanism" of the present invention.

[0036] The component mounting device 1 is equipped with a cooling device for the motors that are the driving source of this linear motion mechanism. Specifically, it is equipped with a Y-axis motor cooling device 20Y for cooling the Y-axis motor 15 and an X-axis motor cooling device 20X for cooling the X-axis motor 18. Each motor cooling device 20X and 20Y is designed to cool the motors 15 and 18 in order to suppress the decrease in performance and durability due to heat generation of the motors 15 and 18, as well as the occurrence of thermal deformation of peripheral equipment. These motor cooling devices 20X and 20Y will be described in detail later.

[0037] The head unit 6 is equipped with multiple axial heads 6a (mounting heads) extending in the vertical direction, and a head drive mechanism that drives these heads 6a. The head drive mechanism individually raises and lowers each head 6a and rotates each head 6a around its central axis (R direction). The tip of each head 6a is equipped with a nozzle for component suction. By selectively supplying negative and positive pressure to each nozzle, the heads 6a suction and hold components and release (mount) components onto the substrate P.

[0038] The component recognition camera 7 is an illumination-integrated camera that captures images from below of components held by suction on the head 6a of the head unit 6. Each component recognition camera 7 is positioned between the substrate transport unit 3 and each component supply unit 5.

[0039] In this component mounting apparatus 1, when a circuit board P is transported to the work position along the conveyor 4, a head unit 6 reciprocates between the component supply unit 5 and the circuit board P placed at the work position, and the head 6a picks up components from the tape feeder 5F and mounts (places) them in predetermined positions on the circuit board P. At this time, the suction state of the components attracted to each head 6a is captured by a component recognition camera 7, and the amount of movement of the head unit 6 is corrected based on the recognition result. When all components have been mounted on the circuit board P, the circuit board P is unloaded from the work position, and the next circuit board P is transported to the work position. By repeating the operation of each part in this manner, a component mounted circuit board is produced.

[0040] [Motor Cooling System Configuration] Since the basic configurations of the motor cooling units 20X and 20Y are the same, we will first describe the configuration of the Y-axis motor cooling unit 20Y in detail, and then briefly mention the configuration of the X-axis motor cooling unit 20X.

[0041] Figure 3 is a schematic diagram of the Y-axis motor cooling device 20Y. More specifically, it is a schematic side view of the Y-axis motor cooling device 20Y as seen from the X1 side of the component mounting device 1.

[0042] As shown in Figures 1 to 3, the Y-axis motor cooling device 20Y is positioned to the side (X1 side) of the Y-axis motor 15 along the fixed rail 12. The Y-axis motor cooling device 20Y is configured to operate in conjunction with the movement of the beam 13 to cool the Y-axis motor 15.

[0043] The Y-axis motor cooling device 20Y includes a pump unit 22, a blower pipe 27, and an intake pipe 28.

[0044] The pump section 22 comprises an elongated pump body 24 in the Y direction and two check valves 25 and 26. The pump body 24 is a bellows tube made of a resin material such as polypropylene, silicone, or Teflon (registered trademark). The pump body 24 is formed to be elastically expandable and contractible, contracting when subjected to a compressive load (external force) in the longitudinal direction and extending (restoring) to its original state when the compressive load is removed. In other words, the pump body 24 is formed to self-return from a contracted state to an extended state due to its elasticity. The pump body 24 may also be composed of a combination of an expandable and contractible cylindrical member and an elastic member such as a spring that biases this cylindrical member in the extension direction.

[0045] The longitudinal ends of the pump section 22 are closed by end walls, namely the first end 24a and the second end 24b. The first end 24a is on the Y1 side, and the second end 24b is on the Y2 side.

[0046] The first check valve 25 and the second check valve 26 are both located near the first end 24a of the pump section 22.

[0047] Each of the check valves 25 and 26 is equipped with an inlet port and an outlet port, and is configured to allow fluid flow from the inlet port to the outlet port while blocking (preventing) fluid flow from the outlet port to the inlet port.

[0048] The outlet port of the first check valve 25 is connected to the pump body 24 either directly or via piping. In this example, the outlet port of the first check valve 25 is directly connected to the pump body 24. This allows the outlet port of the first check valve 25 to communicate with the inside of the pump body 24. On the other hand, the inlet port of the first check valve 25 is connected to the casing 10 via the intake pipe 28. This allows the outside of the casing 10 to communicate with the inlet port of the first check valve 25 through an opening 10a formed in the casing 10 and a filter member (not shown). The casing 10 forms the outer shell of the component mounting device 1 and is a resin or metal cover member that separates the inside from the outside of the machine (see Figures 1 and 2).

[0049] The inlet port of the second check valve 26 is connected to the pump body 24 either directly or via piping. In the illustrated example, the inlet port of the second check valve 26 is directly connected to the pump body 24. This allows the inlet port of the second check valve 26 to communicate with the inside of the pump body 24. On the other hand, the outlet port of the second check valve 26 is connected to the Y-axis motor 15 via a blower pipe 27 (an example of the "guide part" of the present invention). One end of the blower pipe 27 is fixed to the outlet port, and the other end is fixed to the motor body portion of the Y-axis motor 15, or to a bracket or the like provided nearby, and is open toward the Y-axis motor 15. This allows the outlet port of the second check valve 26 to communicate with the space surrounding the Y-axis motor 15.

[0050] As shown in Figures 1 to 3, the pump section 22 is supported by the elevated frame 11. More specifically, the pump body 24 is positioned on a support base (not shown) which includes the mounting section 11a (non-movable part) provided on the elevated frame 11, with the second end 24b of the pump body 24 fixed to the mounting section 11a. The first end 24a of the pump body 24 is left free (displaceable in the Y direction). In other words, the pump section 22 is supported by the elevated frame 11 in a substantially horizontal position and is expandable and contractible in the Y direction with the second end 24b as the fixed end (reference).

[0051] The X1 end of the beam 13 is provided with a contact portion 131 for contact with the pump section 22. The contact portion 131 is the part that presses against the pump body 24 as the beam 13 moves. The contact portion 131 is provided at the end of the beam 13 so as to face the first end 24a of the pump body 24 in the Y direction.

[0052] Next, the operation of the Y-axis motor cooling device 20Y will be explained using Figures 3 and 4.

[0053] In the state shown in Figure 3, in the Y direction, the beam 13 is located approximately in the center between the parts supply section 5 on the Y1 side and the parts supply section 5 on the Y2 side. In this state, the beam 13 is spaced apart from the pump section 22 towards the Y1 side, and therefore the pump body 24 is in an extended state.

[0054] As the beam 13 moves in the Y2 direction (corresponding to the "second direction" of the present invention) from the state shown in Figure 3, the contact portion 131 comes into contact with the first end portion 24a of the pump body 24, as shown in Figure 4(a), and the pump body 24 is compressed and shrinks. In other words, as the beam 13 moves, the first end portion 24a (corresponding to the "displacement portion" of the present invention) moves in the Y2 direction, and the pump body 24 shrinks. This shrinking (compression) of the pump body 24 increases the internal air pressure, causing the second check valve 26 to open. On the other hand, the first check valve 25 is closed by this air pressure. Therefore, the air inside the pump body 24 is discharged from the second check valve 26, and this air is guided to the Y-axis motor 15 through the air supply pipe 27. As a result of this air being blown onto the wall surface of the motor body portion of the Y-axis motor 15, the Y-axis motor 15 is cooled.

[0055] Subsequently, when the beam 13 moves in the Y1 direction (corresponding to the "first direction" of the present invention) from the state shown in Figure 4(a), the pump body 24 extends accordingly, as shown in Figure 4(b). That is, the pump body 24 elastically returns to its original position. This increase in volume due to the extension creates negative pressure in the pump body 24, causing the first check valve 25 to open. On the other hand, the second check valve 26 is closed by the same negative pressure. As a result, air is drawn into the pump body 24 from outside the casing 10 through the intake pipe 28 and the first check valve 25 and stored inside.

[0056] The movement of the beam 13 in the Y2 direction shown in Figure 4(a) is mainly the movement when the head unit 6 takes out parts from the parts supply unit 5 on the Y2 side, and the movement of the beam 13 in the Y1 side shown in Figure 4(b) is the movement when, for example, the parts taken out from the parts supply unit 5 on the Y2 side are mounted on the substrate P by the head unit 6. Therefore, the Y-axis motor cooling device 20Y continuously and alternately cools the Y-axis motor 15 by blowing air and stores air (outside air) inside the pump body 24 as the head unit 6 moves back and forth between the parts supply unit 5 on the Y2 side and the substrate P (working position).

[0057] The configuration of the Y-axis motor cooling system 20Y has been described above. The X-axis motor cooling system 20X has the same basic configuration as the Y-axis motor cooling system 20Y.

[0058] However, the X-axis motor cooling device 20X operates when the head unit 6 moves in the X direction relative to the beam 13 to cool the X-axis motor 18. That is, as shown in Figures 1 and 2, the X-axis motor cooling device 20X has a pump section 22 supported by the beam 13. The pump body 24 is elongated in the X direction, and its second end 24b is fixed to a mounting section 13a provided at the X2 side end of the beam 13. The contact section 6b provided on the head unit 6 is configured to contact the first end 24a of the pump body 24 as the head unit 6 moves in the X2 direction.

[0059] In this configuration, when the head unit 6 moves from the center of the beam 13 in the X direction to the X2 direction, the pump body 24 is compressed and contracted, and air is discharged from the pump body 24 and guided to the X-axis motor 18. This airflow cools the X-axis motor 18. Subsequently, as the head unit 6 moves in the X1 direction, the pump body 24 extends (self-returns), and air (outside air) is drawn into the pump body 24 from outside the casing 10 and stored inside. In this way, as the head unit 6 moves back and forth in the X direction, the cooling of the X-axis motor 18 by airflow and the intake and storage of outside air into the pump body 24 are performed alternately and continuously.

[0060] [Effects, etc.] As explained above, the component mounting device 1 described above is equipped with an X-axis motor cooling device 20X for cooling the Y-axis motor 15 and an X-axis motor cooling device 20X for cooling the X-axis motor 18.

[0061] The Y-axis motor cooling device 20Y includes a pump unit 22. This pump unit 22 is configured to discharge air stored in the pump body 24 as the beam 13 moves in the Y2 direction, and to draw in and store air as the beam 13 moves in the Y1 direction. The Y-axis motor cooling device 20Y then cools the Y-axis motor 15 by guiding the air discharged from the pump unit 22 to the Y-axis motor 15 through the air supply pipe 27.

[0062] The X-axis motor cooling device 20X also includes a pump unit 22. This pump unit 22 is configured to discharge air stored in the pump body 24 as the head unit 6 moves in the X2 direction, and to draw in and store air as the head unit 6 moves in the X1 direction. The X-axis motor cooling device 20X then cools the X-axis motor 18 by guiding the air discharged from the pump unit 22 to the X-axis motor 18 through the air supply pipe 27.

[0063] In other words, the Y-axis motor cooling device 20Y is configured to cool the Y-axis motor 15 by utilizing the reciprocating movement of the beam 13 in the Y direction, and the X-axis motor cooling device 20X is configured to cool the Y-axis motor 15 by utilizing the reciprocating movement of the head unit 6 in the X direction. Therefore, neither motor cooling device 20X nor 20Y consumes power solely for the cooling of motors 15 and 18. Furthermore, since conventional electric fans are not used to cool motors 15 and 18, no noise from electric fans is generated. Consequently, the above-described component mounting device 1 (each motor cooling device 20X, 20Y) can cool the Y-axis motor 15 and X-axis motor 18 relatively quietly and in a rational configuration.

[0064] Furthermore, in the motor cooling devices 20X and 20Y described above, the amount of air supplied to each motor 15 and 18 changes naturally according to the magnitude of the load. Therefore, in this respect as well, it is possible to cool each motor 15 and 18 rationally. In other words, the amount of air discharged (airflow rate) from the pump unit 22 and the amount of outside air drawn in are proportional to the amount of extension and the number of extensions and retractions of the pump body 24. This amount of extension and retraction and the number of extensions and retractions are proportional to the amount of movement and the number of reciprocating movements of the beam 13 and head unit 6, that is, the load on the motor. Therefore, if the amount of movement and the number of reciprocating movements of the beam 13 and head unit 6 are relatively large, the amount of air supplied will naturally increase accordingly, and conversely, if the amount of movement and the number of reciprocating movements of the beam 13 and head unit 6 are relatively small, the amount of air supplied will naturally decrease accordingly. Consequently, it is possible to cool each motor 15 and 18 rationally according to its load, or in other words, according to the amount of heat generated, without providing a mechanism to adjust the amount of air supplied according to the load on the motors 15 and 18.

[0065] Furthermore, as previously described, the pump body 24 of the pump section 22 is made of a bellows tube that contracts when subjected to a longitudinal compressive load (external force) and expands to its original state when the compressive load is removed. In the motor cooling devices 20X and 20Y described above, the expansion and contraction of this pump body 24 is used to switch between blowing air from the pump section 22 and drawing air into the pump section 22. Therefore, there is also the advantage that the blowing and drawing functions of the pump section 22 are achieved with a relatively simple and inexpensive configuration using a bellows tube.

[0066] Furthermore, the motor cooling devices 20X and 20Y are configured to store air from outside the component mounting device 1, i.e., air from outside the casing 10, in the pump body 24, and to cool the motors 15 and 18 with this air. Therefore, it is possible to cool the motors 15 and 18 with relatively low-temperature air from outside the machine, which contributes to improving the cooling efficiency of the motors.

[0067] In the first embodiment, the Y-axis motor cooling device 20Y is equipped with a pump unit 22 only on the Y2 side of the elevated frame 11. However, pump units 22 may be provided on both sides in the Y direction, with the beam 13 in between. That is, when the beam 13 moves in the Y2 direction from the position shown in Figure 3, the pump body 24 of the pump unit 22 on the Y2 side is compressed to cool the Y-axis motor 15, while when the beam 13 moves in the Y1 direction from the position shown in Figure 3, the pump body 24 of the pump unit 22 on the Y1 side is compressed to cool the Y-axis motor 15.

[0068] This configuration allows the Y-axis motor 15 to be cooled not only when the beam 13 moves in the Y2 direction, but also when it moves in the Y1 direction. In other words, the Y-axis motor 15 can be cooled not only when the head unit 6 removes parts from the Y2-side parts supply unit 5, but also when it removes parts from the Y1-side parts supply unit 5. Therefore, the cooling performance of the Y-axis motor 15 is improved.

[0069] Similarly, the motor cooling device 20X for the X-axis motor 18 may also be equipped with a pair of pump units 22 on both sides of the beam 13 in the X direction. With this configuration, the X-axis motor 18 can be cooled not only when the head unit 6 moves in the X2 direction, but also when the head unit 6 moves in the X1 direction. Therefore, the cooling performance of the X-axis motor 18 is improved.

[0070] Furthermore, in the first embodiment, the first end portion 24a (displacement portion) of the pump body 24 in the motor cooling devices 20X and 20Y is free, but it may be fixed to the beam 13 or the head unit 6. In other words, the pump body 24 may be configured to forcibly expand and contract in conjunction with the movement of the beam 13 or the head unit 6. In this configuration, the pump body 24 expands and contracts while the first end portion 24a of the pump body 24 moves together with the beam 13 or the head unit 6.

[0071] In this case, the total length of the pump body 24 when extended in the longitudinal direction is set to an appropriate length corresponding to the range of motion of the beam 13 and the head unit 6, so that it can follow them. Furthermore, the pump body 24 does not necessarily need to be configured to elastically return to its original position, as long as it is expandable and contractible.

[0072] [Second Embodiment] Figure 5 is a plan view of the component mounting device 1, and Figure 6 is a front view of the component mounting device 1 as seen from the Y2 side. Figure 7 is a schematic diagram of the Y-axis motor cooling device 20Y. More specifically, it is a schematic side view of the Y-axis motor cooling device 20Y as seen from the X1 side of the component mounting device 1.

[0073] The component mounting apparatus 1 of the second embodiment differs from the first embodiment in the configuration of the X-axis motor cooling device 20X and the Y-axis motor cooling device 20Y, as described below. Since the basic configurations of the motor cooling devices 20X and 20Y are the same, the configuration of the Y-axis motor cooling device 20Y will be described in detail first, followed by a brief mention of the configuration of the X-axis motor cooling device 20X. Furthermore, parts identical to those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted or simplified (this also applies to the third and fourth embodiments described later).

[0074] As shown in Figures 5 and 6, the Y-axis motor cooling device 20Y is positioned to the side (X1 side) of the Y-axis motor 15 along the fixed rail 12.

[0075] The Y-axis motor cooling device 20Y of the second embodiment is similar to the first embodiment in that it includes a pump section 22, a blower pipe 27, and an intake pipe 28, as shown in Figure 7. However, it differs from the first embodiment in that the pump body 24 is made of a resin or metal cylinder (cylindrical body) with a piston 24c (corresponding to the "displacement section" of the present invention) inside.

[0076] As shown in Figure 1, the pump body 24 has a length (length in the Y direction) that is equal to or close to the movable range of the beam 13 in the Y direction, and is fixed to the elevated frame 11 via the mounting portion 11a. The piston 24c is, for example, a cylindrical body made of resin, and is provided to be movable in the longitudinal direction (Y direction) of the pump body 24 in an airtight manner with respect to the inner circumferential surface of the pump body 24.

[0077] Guide pulleys 31 are provided on both longitudinal outer sides of the pump body 24. Each guide pulley 31 is rotatably supported, for example, by the mounting portion 11a. An endless connecting belt 30 is stretched across these guide pulleys 31. More specifically, as shown in Figure 7, the connecting belt 30 is stretched across each guide pulley 31 such that a portion of the belt passes through the pump body 24 and the piston 24c.

[0078] The connecting belt 30 is fixed to the piston 24c inside the pump body 24 and to the beam 13 outside the pump body 24. This connects the beam 13 and the piston 24c via the connecting belt 30, causing the beam 13 and the pump body 24 to move in opposite directions in conjunction with each other. As shown in Figure 7, the beam 13 and the piston 24c are connected via the connecting belt 30 such that when the beam 13 is located in the center (longitudinal center) of the pump body 24, the piston 24c is also located in the center of the pump body 24.

[0079] The pump body 24 is closed at both ends by the first end 24a and the second end 24b, and the connecting belt 30 passes through the pump body 24 through through holes formed in each end 24a and 24b. The space between the inner circumferential surface of the through hole and the connecting belt 30 is sealed so as to allow movement of the connecting belt 30 while maintaining airtightness. However, a gap may be provided between the inner circumferential surface of the through hole and the connecting belt 30, provided that the air supply (cooling) function for the Y-axis motor 15 described later is not significantly hindered.

[0080] Next, the operation of the Y-axis motor cooling device 20Y will be explained using Figures 7 and 8. Figure 8 is an explanatory diagram of the operation of the Y-axis motor cooling device 20Y of the second embodiment.

[0081] In the state shown in Figure 7, the beam 13 is located approximately in the center between the Y1-side component supply unit 5 and the Y2-side component supply unit 5. When the beam 13 moves in the Y1 direction from this position, the piston 24c inside the pump body 24 moves in the Y2 direction (opposite to the direction of movement of the beam 13), as shown in Figure 8(a). This movement of the piston 24c compresses the air between the piston 24c and the second end 24b, increasing the air pressure and opening the second check valve 26 while closing the first check valve 25. As a result, the air inside the pump body 24 is discharged from the second check valve 26 and guided to the Y-axis motor 15 through the air supply pipe 27. This airflow cools the Y-axis motor 15.

[0082] Subsequently, when the beam 13 moves in the Y2 direction from the position shown in Figure 8(a), the piston 24c moves in the Y1 direction, as shown in Figure 8(b). This movement of the piston 24c increases the volume between the piston 24c and the second end 24b, creating negative pressure inside the pump body 24. This causes the first check valve 25 to open while the second check valve 26 closes. As a result, air (outside air) is drawn into the pump body 24 from outside the casing 10 through the intake pipe 28 and stored inside.

[0083] As the beam 13 moves back and forth in the Y direction, the piston 24c moves inside the pump body 24 in conjunction with it, so that the pump section 22 alternately and continuously draws in (stores) outside air into the pump body 24 and blows air from the pump body 24 to the Y-axis motor 15, that is, cools the Y-axis motor 15.

[0084] The configuration of the Y-axis motor cooling device 20Y has been described in detail above, but the X-axis motor cooling device 20X has the same basic configuration as the Y-axis motor cooling device 20Y. However, in the X-axis motor cooling device 20X, as shown in Figures 1 and 2, the pump body 24 of the pump section 22 extends in the X direction, and the piston 24c is connected to the head unit 6 via a connecting belt 30. With this configuration, as the head unit 6 moves back and forth in the X direction, the pump section 22 continuously and alternately performs intake (storage) of outside air and blowing air to the X-axis motor 18, that is, cooling of the X-axis motor 18.

[0085] In the component mounting apparatus 1 of the second embodiment described above, the Y-axis motor 15 and X-axis motor 18 are cooled by utilizing the movement of the beam 13 in the Y direction and the movement of the head unit 6 in the X direction. Furthermore, each motor 15 and 18 is cooled without the use of an electric fan. Therefore, similar to the component mounting apparatus 1 of the first embodiment, it is possible to cool each motor 15 and 18 relatively quietly and with a rational configuration.

[0086] [Third Embodiment] Figure 9 is a schematic diagram of the main parts of the component mounting device 1, and more specifically, a schematic side view of the head unit drive mechanism 8 and the Y-axis motor cooling device 20Y when the component mounting device 1 is viewed from the X1 side.

[0087] In the third embodiment, a linear motor is used as the drive source for the head unit drive mechanism 8 instead of a rotary motor (motor 15, 18), and as shown in Figure 9, the beam 13 is driven by the linear motor 40. In this example, the linear motor 40 is incorporated into the fixed rail 12 and the slider 13S mounted on the fixed rail 12. That is, the linear motor 40 includes a movable element 41 provided on the slider 13S and a stator 42 provided on the fixed rail 12. The movable element 41 is an armature with a plurality of coils wound around a core, and the stator 42 is a field magnet consisting of a plurality of permanent magnets arranged in the Y direction such that the magnetic poles on the movable element 41 side are alternately different.

[0088] The movable element 41 and the stator 42 face each other with a specified gap in between. When a predetermined drive current is applied to the movable element 41, a magnetic field is generated in each coil, creating a thrust (driving force) between the movable element 41 and the stator 42 that moves the slider 13S in the Y direction. In other words, the beam 13 is fixed to the slider 13S and moves in the Y direction together with the slider 13S due to this thrust.

[0089] The basic configuration of the Y-axis motor cooling device 20Y is the same as in the second embodiment. However, in the second embodiment, as shown in Figure 9, the motor-side end of the air blower 27 is fixed to the beam 13 or slider 13S and directed toward the movable element 41. In other words, in the third embodiment, the Y-axis motor cooling device 20Y cools the movable element 41 (armature) of the linear motor 40 by blowing air mainly toward the movable element 41 (armature).

[0090] In the component mounting apparatus 1 of the third embodiment, as described above, the intake (storage) of outside air and the blowing of air from the pump unit 22 to the linear motor 40, i.e., cooling of the movable element 41, are performed alternately and continuously in conjunction with the reciprocating movement of the beam 13 in the Y direction.

[0091] In the third implementation, the end of the air blower pipe 27 is fixed to the beam 13 and moves together with the beam 13. Therefore, the air blower pipe 27 is provided so as to be able to follow the movement of the beam 13 without obstruction. For example, a part of the air blower pipe 27 may be configured to be extendable or retractable, or it may be connected to the beam 13 through a guide member such as a cable carrier (registered trademark).

[0092] Although not shown in the diagram, in the third embodiment, the head unit 6 is also driven by a linear motor in the same configuration as the beam 13. The X-axis motor cooling device 20X is also configured to cool the movable element of the linear motor. That is, as the head unit 6 moves back and forth in the X direction, the intake (storage) of outside air and the blowing of air from the pump unit 22 to the linear motor, i.e., the cooling of the movable element, are performed alternately and continuously.

[0093] According to the component mounting apparatus 1 of the third embodiment described above, the movable element 41 (armature), which is a heat-generating part of the linear motor 40 that is the drive source of the head unit drive mechanism 8, can be cooled relatively quietly and in a rational configuration.

[0094] [Fourth Embodiment] Figure 10 is a schematic diagram of the main parts of the component mounting device 1, and more specifically, it is a schematic side view of the head unit drive mechanism 8 and the Y-axis motor cooling device 20Y when the component mounting device 1 is viewed from the X1 side.

[0095] The component mounting apparatus 1 of the fourth embodiment differs from the third embodiment in the following respects, in the configuration of each motor cooling device 20X, 20Y. Specifically, the Y-axis motor cooling device 20Y of the fourth embodiment has a configuration in which the Y-axis motor cooling device 20Y is substantially equipped with two pump units 22.

[0096] Specifically, as shown in Figure 10, in the fourth embodiment, in addition to the second end 24b side of the pump body 24, the first end 24a side is also provided with a first check valve 25, a second check valve 26, a blower pipe 27, and an intake pipe 28. The motor-side end of the blower pipe 27 is fixed to the beam 13 or slider 13S and directed toward the movable element 41, similar to the third embodiment.

[0097] The operation of the Y-axis motor cooling device 20Y of the fourth embodiment will be described below with reference to Figures 10 and 11. Figure 11 is an explanatory diagram of the operation of the Y-axis motor cooling device 20Y of the fourth embodiment. For convenience, the connecting belt 30 and the guide pulley 31 are omitted in Figure 11. Also, for convenience, in the following description, the pump section 22 may be referred to as the first pump section 22A, with the piston 24c and the side from the first end 24a, and the pump section 22B, with the piston 24c and the side from the second end 24b.

[0098] In the state shown in Figure 10, the beam 13 is located approximately in the center between the parts supply unit 5 on the Y1 side and the parts supply unit 5 on the Y2 side. When the beam 13 moves in the Y1 direction from this position, the piston 24c inside the pump body 24 moves in the Y2 direction (opposite to the direction of movement of the beam 13), as shown in Figure 11(a).

[0099] As the piston 24c moves, the air between the piston 24c and the second end 24b in the second pump section 22B is compressed, increasing the air pressure. This causes the second check valve 26 to open while the first check valve 25 closes. As a result, the air inside the pump body 24 is guided to the Y-axis motor 15 through the second check valve 26 and the air supply pipe 27. This airflow cools the movable element 41.

[0100] On the other hand, in the first pump section 22A, a negative pressure is generated inside the pump body 24 (between the piston 24c and the first end 24a) due to the volume increase between the piston 24c and the second end 24b, causing the first check valve 25 to open while the second check valve 26 closes. As a result, air is drawn into the pump body 24 from outside the casing 10 through the intake pipe 28 and stored inside.

[0101] Subsequently, when the beam 13 moves in the Y2 direction from the position shown in Figure 11(a), the piston 24c moves in the Y1 direction. As the piston 24c moves in the Y1 direction, as shown in Figure 11(b), a negative pressure is generated inside the pump body 24 (between the piston 24c and the second pump body 22B) due to the volume increase between the piston 24c and the second end 24b, causing the first check valve 25 to open while the second check valve 26 closes. As a result, air is drawn into the pump body 24 from outside the casing 10 through the intake pipe 28 and stored inside.

[0102] On the other hand, in the first pump section 22A, the air between the piston 24c and the first end 24a is compressed, increasing the air pressure. This causes the second check valve 26 to open while the first check valve 25 closes. As a result, the air inside the pump body 24 is guided to the Y-axis motor 15 through the second check valve 26 and the air supply pipe 27. This airflow cools the Y-axis motor 15.

[0103] Thus, in the Y-axis motor cooling device 20Y of the fourth embodiment, as the beam 13 moves back and forth, the first pump unit 22A continuously alternates between drawing in (storing) outside air and blowing air onto the movable element 41 (cooling the movable element 41), while the second pump unit 22B continuously alternates between drawing in (storing) outside air and blowing air onto the movable element 41 (cooling the movable element 41), in the opposite phase to the first pump unit 22A. In other words, in the Y-axis motor cooling device 20Y of the fourth embodiment, air is blown onto the movable element 41 regardless of whether the beam 13 moves in the Y1 direction or the Y2 direction. Therefore, the movable element 41 is always cooled by the Y-axis motor cooling device 20Y while the beam 13 is moving.

[0104] Although not shown in the figures, in the fourth embodiment, the X-axis motor cooling device 20X is configured to have essentially two pump units 22, similar to the Y-axis motor cooling device 20Y. As a result, the movable element of the linear motor for moving the head unit 6 in the X direction is also cooled at all times while the head unit 6 is moving.

[0105] According to the component mounting apparatus 1 of the fourth embodiment described above, similar to the component mounting apparatus 1 of the third embodiment, the linear motor (movable element), which is the drive source of the head unit drive mechanism 8, can be cooled relatively quietly and in a rational configuration. In particular, in the fourth embodiment, as previously described, the movable element is cooled at all times while the beam 13 and head unit 6 are moving. Therefore, it is possible to cool the movable element more effectively compared to the third embodiment.

[0106] [Differentiations, etc.] Although embodiments of the present invention have been described above, the component mounting apparatus 1 of the first to fourth embodiments described above are examples of preferred embodiments of the component mounting apparatus according to the present invention (a component mounting apparatus equipped with the motor cooling device of the present invention), and the specific configurations of the component mounting apparatus and the motor cooling device can be appropriately modified without departing from the spirit of the present invention.

[0107] For example, in the first to fourth embodiments, the X-axis motor cooling device 20X and the Y-axis motor cooling device 20Y all have equivalent configurations. However, the configurations of the X-axis motor cooling device 20X and the Y-axis motor cooling device 20Y may differ from each other. Specifically, in the component mounting device 1 of the second embodiment (Figures 5 and 6), for example, if the beam 13 is driven by a linear motor, a configuration similar to the Y-axis motor cooling device 20Y of the third and fourth embodiments (Figures 9 and 10) may be applied as the Y-axis motor cooling device 20Y.

[0108] Furthermore, the X-axis motor cooling device 20X and the Y-axis motor cooling device 20Y may be configured by appropriately combining the configurations of the first to fourth embodiments described above. For example, each motor cooling device 20X, 20Y of the second embodiment (Figure 7) may be configured to have substantially two pump units 22 (pump units 22A, 22B), similar to each motor cooling device 20X, 20Y of the fourth embodiment (Figure 10). With this configuration, it is possible to cool each motor 15, 18 at all times while the beam 13 and head unit 6 are moving.

[0109] Furthermore, in the X-axis motor cooling device 20X and the Y-axis motor cooling device 20Y, the part that blows air from the pump unit 22 to the motors 15, 18, 40(41) (guide unit) may be provided as a separate component (air blower pipe 27) from the pump unit 22, as in the first to fourth embodiments, or it may be provided integrally with the pump unit 22. For example, the second check valve 26 of the pump unit 22 may be configured to substantially also function as the air blower pipe 27. That is, the X-axis motor cooling device 20X and the Y-axis motor cooling device 20Y may be configured such that the second check valve 26 is directly connected to the motors 15, 18, 40(41), so that air is guided from the pump body 24 to the motors 15, 18, 40(41) via the second check valve 26.

[0110] Furthermore, while the first to fourth embodiments described an example in which the motor cooling device according to the present invention is provided in a component mounting device 1, the motor cooling device can also be applied to various linear motion robots (linear motion mechanisms) and other substrate production equipment other than component mounting devices that are equipped with such linear motion robots (for example, printing devices, dispenser devices, inspection devices, etc.). [Explanation of symbols]

[0111] 1. Component mounting equipment 6. Head unit (mobile unit) 8. Head unit drive mechanism (linear motion mechanism) 10 Casing 13. Beam (Mobile) 18 X-axis motor 20X X-axis motor cooling system 20Y Y-axis motor cooling system 22 Pump section 24 Pump body 24a First end (displaced portion) 24b Second end 24c Piston (Displacement part) 25. First check valve 26. Second check valve 27 Air pipe (guide section) 28 Intake pipe

Claims

1. A motor cooling device for cooling a motor in a linear motion mechanism comprising a motor and a moving body that reciprocates by the driving force of the motor, When one of the reciprocating directions of the moving body is designated as the first direction and the other as the second direction, A pump unit having a displacement part that is movable in a direction parallel to the reciprocating direction as the moving body moves back and forth, and having the function of drawing in and storing air as the displacement part moves in a first direction, and the function of discharging the stored air as the displacement part moves in a second direction, The system includes a guide unit that guides the air discharged from the pump unit to the motor, The pump section consists of a bellows tube that is expandable and contractible in the direction of the reciprocating movement. At least one end of the bellows tube on the second direction side is fixed to a non-movable portion. The displacement portion is the end of the bellows tube on the first direction side, The bellows tube is configured to be elastically expandable and contractible so that it remains in an extended state when no external force is applied in the second direction, by leaving the end on the first direction side free. A motor cooling device characterized in that the moving body is provided with a contact portion that, as it moves in the second direction, abuts against the end of the bellows tube on the first direction side and compresses the bellows tube.

2. In the motor cooling device according to claim 1, The aforementioned pump section is A pump body that generates negative pressure inside due to the movement of the displacement part in the first direction, The first check valve opens due to the negative pressure, allowing air to be drawn into the pump body. valve and, The pump includes a second check valve that opens when the air inside the pump body is compressed as the displacement part moves in the second direction, allowing air to be discharged from the pump body. The motor cooling device is characterized in that the guide section guides the air discharged through the second check valve to the motor.

3. In the motor cooling device according to claim 1 or 2, The motor is a linear motor comprising an armature and a movable element provided on the moving body side, and a stator made of a field. The motor cooling device is characterized in that the guide section guides the air discharged from the pump section to the movable element.

4. A component mounting apparatus comprising a motor, a moving body that reciprocates by the driving force of the motor, and a mounting head provided on the moving body, A component mounting apparatus characterized by comprising a motor cooling device according to claim 1 or 2 as a motor cooling device for cooling the motor.

5. In the component mounting apparatus described in claim 4, It forms the outer casing of the device and also includes a casing that separates the inside from the outside of the device. A component mounting apparatus characterized in that the pump section of the motor cooling device draws in and stores air from outside the casing.

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