JP2020147892A - Form vibration device - Google Patents

Abstract

To provide a form vibration device capable of applying impact to a form with constant force and frequency, regardless of the level of skill or the fatigue degree of a user, and allowing easy installation, carriage and efficient work.SOLUTION: A form vibration device 100 related to one embodiment of the present invention comprises: a piston member 2 reciprocatively supported and having a weight part 21 colliding with a form K at a front end part in the reciprocating direction; multiple driving permanent magnets 41 mounted on the piston member 2 to be juxtaposed in the reciprocating direction; an electromagnetic coil 42 provided separately from the piston member 2 so as to enclose the periphery thereof; and a control circuit 7 switching the polarity of the electromagnetic coil 42.SELECTED DRAWING: Figure 1

Description

The present invention relates to a formwork vibrating device for vibrating a formwork for placing concrete.

When placing concrete at a construction site or the like, if the concrete solidifies in the presence of air bubbles inside, there is a risk that the quality such as strength or finish will vary. Therefore, in order to keep the quality of concrete uniform, a step of removing air bubbles from the inside of the cast concrete before it solidifies is required. As a method of removing air bubbles from the cast concrete, a method of directly vibrating the concrete by inserting a rod-shaped vibrator or a method of indirectly vibrating the concrete by vibrating the formwork installed for concrete casting. A method of vibrating is known.

Here, as a means for vibrating the mold, a mold vibrating device has been conventionally proposed (see, for example, Patent Documents 1 and 2). The formwork vibrating device disclosed in Patent Document 1 (see FIG. 1) includes a metal hammer main body 1 and a rubber or plastic hammer head 2 detachably attached to the tip thereof. It is a hammer for. According to this formwork vibrating device, the formwork W vibrates when the user grips the handle portion 10 of the hammer main body 1 and hits the formwork W from the outside with the hammer head 2.

The formwork vibrating device disclosed in Patent Document 2 (see FIGS. 1 and 3) connects a chisel 3 which is a rod-shaped member, an air hammer main body 2 accommodating a piston 9, and the chisel 3 and an air hammer main body 2. It includes a spring 4 and an operating lever 6 provided on the air hammer main body 2. According to this formwork vibrating device, when the user operates the operating lever, compressed air is supplied from the compressed air supply device 10 to the inside of the air hammer main body 2. Then, the piston 9 presses the chisel 3, and the chisel 3 protruding forward hits the mold (not shown), so that the mold vibrates. Then, the chisel 3 protruding forward is pulled back backward by the restoring force of the spring 4. At this time, the compressed air inside the air hammer main body 2 is discharged to the outside of the air hammer main body 2 through the exhaust hole 8.

Japanese Unexamined Patent Publication No. 2006-130571 Japanese Unexamined Patent Publication No. 2000-271877

According to the mold vibrating device of Patent Document 1, since it is easy to carry, the work of vibrating the mold while the user moves to an arbitrary place can be efficiently performed. However, according to this formwork vibrating device, the amount of force to hit the formwork and the number of hits are left to the judgment of the user, so the strength of concrete or the strength of concrete depends on the skill level and fatigue level of the user. There is a problem that the quality such as the finish varies.

According to the formwork vibrating device of Patent Document 2, since the user only operates the operation lever, the magnitude of the striking force and the number of striking times are kept constant regardless of the user's skill level and fatigue level. You can hit the formwork. However, according to this formwork vibrating device, in order to supply compressed air to the formwork vibrating device, a compressed air supply device is installed at the site, and the compressed air supply device and the formwork vibrating device are connected by a high pressure hose. Need to connect. Therefore, there is a problem that it is difficult for the user to efficiently perform the work of vibrating the mold while moving to an arbitrary place.

Therefore, the present invention has been made in consideration of such circumstances, and an object of the present invention is to give an impact to the mold with a constant force magnitude and number of times regardless of the skill level and fatigue level of the user. At the same time, it is an object of the present invention to provide a formwork vibrating device that is easy to install and carry and can perform work efficiently.

According to one aspect of the present invention, it is a formwork vibrating device for vibrating a formwork for placing concrete, and a weight portion that is supported so as to be reciprocating and collides with the formwork is a front end in the reciprocating movement direction. A piston member provided in the portion, a plurality of permanent driving magnets attached to the piston member so as to line up in the reciprocating direction, and an electromagnetic wave provided so as to be separated from the piston member and surround the periphery thereof. Provided is a formwork vibrating device including a coil and a control circuit for switching the polarity of the electromagnetic coil.

In the formwork vibrating device according to one aspect of the present invention, the control circuit of the electromagnetic coil is formed by changing at least one of the voltage value applied to the electromagnetic coil and the period of the voltage. The speed at which the polarity is switched may be changeable.

Further, the formwork vibrating device according to one aspect of the present invention further includes a position sensor that detects the position of the piston member in the reciprocating direction, and the control circuit has the electromagnetic wave based on the output from the position sensor. The polarity of the coil may be switched.

Further, in the frame vibrating device according to one aspect of the present invention, a permanent magnet for position detection is attached to the piston member, and the position sensor is a magnetic sensor that detects a magnetic field generated by the permanent magnet for position detection. There may be.

Further, the formwork vibrating device according to one aspect of the present invention reciprocates the piston member by accommodating a portion to which the driving permanent magnet is attached and projecting the weight portion to the outside. A body case that supports the movement may be further provided.

Further, in the formwork vibrating device according to one aspect of the present invention, the main body case may have a battery accommodating portion capable of accommodating a battery that supplies power to the electromagnetic coil.

Further, in the formwork vibrating device according to one aspect of the present invention, a tubular piston cover that covers a portion of the piston member that protrudes to the outside of the main body case protrudes from the main body case in the reciprocating direction. It may be provided.

Further, in the formwork vibrating device according to one aspect of the present invention, the protruding direction tip of the piston cover is a predetermined distance in the reciprocating direction from the tip when the weight is most advanced in the reciprocating direction. It may be located at the rear.

Further, in the mold vibration device according to one aspect of the present invention, a flange portion is provided so as to project from the piston member toward the piston cover, and the flange portion protrudes from the inner side surface of the piston cover toward the piston member. Therefore, a restricting portion for restricting the forward movement of the flange portion in the reciprocating movement direction may be provided.

Further, in the formwork vibrating device according to one aspect of the present invention, air holes may be formed by penetrating the vicinity position of the main body case in the piston cover in the thickness direction.

Further, in the formwork vibrating device according to one aspect of the present invention, the weight portion may have a portion that collides with the formwork formed on a flat surface or a convex curved surface.

Further, in the frame vibrating device according to one aspect of the present invention, spacers made of a magnetic material are provided between the adjacent permanent magnets for driving, and the width dimension of the electromagnetic coil in the reciprocating direction is the said. It may be substantially equal to the total value of the length dimension in the reciprocating direction of the driving permanent magnet and the thickness dimension in the reciprocating direction of the spacer.

Further, in the mold vibration device according to one aspect of the present invention, a plurality of the electromagnetic coils are provided in the reciprocating direction, and the distance between the adjacent electromagnetic coils determines the width dimension of the electromagnetic coils in the reciprocating direction. It may be substantially equal to the value divided by the number of electromagnetic coils.

According to the mold vibrating device according to one aspect of the present invention, the mold can be impacted with a constant force magnitude and number of times regardless of the skill level and fatigue level of the user, and can be installed and carried. Is easy and efficient.

It is a partial cross-sectional view which shows the structure of the formwork vibration apparatus 100 which concerns on embodiment of this invention.

Hereinafter, the formwork vibrating device according to the embodiment of the present invention will be described with reference to the drawings.

(Structure of formwork vibrating device)
FIG. 1 is a partial cross-sectional view showing the configuration of the formwork vibrating device 100 according to the embodiment of the present invention. The formwork vibrating device 100 includes a hollow main body case 1, a piston member 2 reciprocally supported by the main body case 1, a piston cover 3 provided so as to project forward from the main body case 1, and the main body case 1. A drive unit 4 provided inside, a position detection unit 5 also provided inside the main body case 1, an operation lever 6 provided so as to be able to appear and disappear from the main body case 1, and an operation lever 6 provided inside the main body case 1. It includes a control circuit 7.

The main body case 1 accommodates various members including the piston member 2. As shown in FIG. 1, the main body case 1 includes a cylindrical tubular portion 8 having an open end, a pair of piston bearings 9 provided inside the tubular portion 8, and the tubular portion 8 as well. The magnetic field line shielding plate 10 provided inside, the grip portion 11 provided adjacent to the tubular portion 8 and gripped by the user, and the battery accommodating portion 12 provided adjacent to the grip portion 11 Have.

The pair of piston bearings 9 play a role of reciprocally supporting the piston member 2. As shown in FIG. 1, these piston bearings 9 are so-called slide bearings in which the bush 14 is fitted into the bush mounting hole 131 formed in the bearing body 13. One of these piston bearings 9 is provided so as to close the opening of one end portion in the axial direction of the tubular portion 8, and the other is provided in the intermediate portion in the axial direction of the tubular portion 8.

The magnetic field line shielding plate 10 serves to shield the position detection unit 5 from the magnetic field lines emitted by the drive unit 4. As shown in FIG. 1, the magnetic field line shielding plate 10 is a metal plate-shaped member in which the piston insertion hole 101 is formed. The magnetic field line shielding plate 10 is provided at a position adjacent to the piston bearing 9 provided in the axially intermediate portion of the tubular portion 8.

The battery accommodating unit 12 accommodates a rechargeable battery 15 (indicated by a broken line in FIG. 1) for supplying power to the drive unit 4 and the like. The battery accommodating portion 12 is configured to accommodate the rechargeable battery 15, and is electrically connected to the drive unit 4 and the like via electrical wiring (not shown). Further, the battery accommodating portion 12 is provided detachably from the grip portion 11 of the main body case 1. Therefore, when the voltage of the rechargeable battery 15 drops, the battery accommodating portion 12 is removed from the grip portion 11, the accommodating rechargeable battery 15 is replaced with a charged spare rechargeable battery 15, and then the battery accommodating portion 12 is gripped. It may be attached to 11. As a result, the power supply to the drive unit 4 and the like can be quickly restarted while minimizing the time for interrupting the work.

Next, as shown in FIG. 1, the piston member 2 constituting the formwork vibrating device 100 includes a long piston main body 20, a weight 21 attached to the tip of the piston main body 20, and a piston main body. It has a flange portion 22 that protrudes from 20 and is provided.

The piston body 20 plays a role of accommodating a part of the members constituting the drive unit 4 and the position detection unit 5. The piston body 20 is made of stainless steel or the like and has a cylindrical shape. Further, although details are not shown in the drawing, a protrusion 201 is provided so as to protrude from the axial tip portion of the piston main body portion 20, and a male screw is cut on the outer peripheral surface thereof.
The weight portion 21 plays a role of vibrating the mold K by colliding with the mold K. The weight portion 21 is made of metal, hard rubber, plastic, or the like, and has a cylindrical shape. Here, a concave groove 211 is formed on the bottom surface of the weight portion 21, and a female screw to be screwed into the male screw of the protrusion 201 is cut on the inner peripheral surface thereof. Further, the weight portion 21 has a flat surface having a portion that collides with the tip surface 212, that is, the mold K.
The flange portion 22 plays a role of defining a front end position where the piston member 2 can move forward in the reciprocating direction. The flange portion 22 is made of metal or the like and has an annular shape. The outer diameter of the flange portion 22 is set to be larger than the outer diameter of the weight portion 21. The flange portion 22 configured in this way is fixed to the axial tip portion on the peripheral surface of the piston main body portion 20. As a result, the peripheral edge portion of the flange portion 22 is in a state of extending radially outward from the weight portion 21.

As shown in FIG. 1, the piston member 2 configured in this way is housed inside the main body case 1, and a part of the weight portion 21 thereof protrudes to the outside of the main body case 1. .. The piston member 2 is inserted into the bushes 14 of the pair of piston bearings 9 so as to be reciprocally supported along the axial direction thereof. Further, the piston member 2 is also inserted into the piston insertion hole 101 of the magnetic field line shielding plate 10, so that the base end portion thereof is located behind the magnetic field line shielding plate 10 in the reciprocating direction.

Next, as shown in FIG. 1, the piston cover 3 constituting the formwork vibrating device 100 includes a cover main body 31 attached to the front end portion of the main body case 1 and oil provided at the base end portion of the cover main body 31. It has a seal 32 and a regulation portion 33 provided at the tip end portion of the cover main body 31.

The cover main body 31 serves to cover a portion of the piston member 2 that protrudes to the outside of the main body case 1, that is, most of the weight portion 21. The cover body 31 is made of metal, hard plastic, or the like, and has a cylindrical shape with both ends open. A plurality of air holes 311 are formed in the cover main body 31 so as to penetrate the vicinity position of the main body case 1 in the thickness direction. The cover main body 31 configured in this way is fixed to the piston bearing 9 constituting the main body case 1.
The oil seal 32 has a role of preventing foreign matter such as dust existing inside the cover main body 31 from entering the inside of the main body case 1, and lubricating oil (not shown) used in the piston bearing 9 is outside the main body case 1. It plays a role of preventing leakage to. Although not shown in detail in the figure, the oil seal 32 has a conventionally known mechanism capable of preventing oil from leaking from the gap. The oil seal 32 configured in this way is provided so as to close the gap between the cover main body 31 and the piston member 2.
The regulating unit 33 plays a role of restricting the forward movement of the piston member 2 in the reciprocating direction. The regulation unit 33 is made of metal or the like and has a cylindrical shape. The inner diameter of the regulating portion 33 is set to be larger than the outer diameter of the weight portion 21 and smaller than the outer diameter of the flange portion 22 of the piston member 2. Further, the outer diameter of the regulating portion 33 is set to be substantially equal to the inner diameter of the cover main body 31. Further, the axial length of the regulating portion 33 is set to be slightly shorter than the axial length of the weight portion 21. The regulating portion 33 configured in this way is fixed to the axial tip portion on the inner peripheral surface of the cover main body 31.

The drive unit 4 constituting the formwork vibrating device 100 plays a role of driving the piston member 2 in the reciprocating direction. As shown in FIG. 1, the drive unit 4 has a plurality of drive permanent magnets 41, a plurality of first spacers 43, and a plurality of electromagnetic coils 42.

Each of the plurality of driving permanent magnets 41 has a cylindrical shape, and is a permanent magnet having an N pole on one side in the axial direction and an S pole on the other side. Each drive permanent magnet 41 has a length dimension Lm substantially equal to that in the reciprocating direction. Although the details of these driving permanent magnets 41 are not shown in the drawing, they are inserted into the piston main body 20 of the piston member 2 so that the same poles of the adjacent driving permanent magnets 41 face each other. In the present embodiment, the five driving permanent magnets 41 are respectively inserted into the piston main body 20 so that they are located at the axial center of the piston member 2.

The plurality of first spacers 43 play a role of preventing the plurality of driving permanent magnets 41 from magnetically interacting with each other. Each first spacer 43 is a plate-shaped member made of a magnetic material, and has substantially the same thickness dimension Ts in the reciprocating direction. In the present embodiment, an iron piece having a thickness of about 1 mm is used as the first spacer 43. The four first spacers 43 configured in this way are arranged so as to fill the gaps between the adjacent permanent magnets for driving 41.

Each of the plurality of electromagnetic coils 42 is a long coil wound around a bobbin (not shown), and power is supplied from the rechargeable battery 15 housed in the battery housing portion 12. Each electromagnetic coil 42 has a width dimension Wc that is substantially equal in the reciprocating direction. Here, the width dimension Wc is set to be substantially equal to the total value of the length dimension Lm in the reciprocating direction of the driving permanent magnet 41 and the thickness dimension Ts in the reciprocating direction of the first spacer 43 ( Wc = Lm + Ts). In the present specification, the "width dimension Wc of the electromagnetic coil 42" means a dimension excluding the thickness dimension of the bobbin. The electromagnetic coil 42 configured in this way is provided so as to be separated from the piston member 2 and surround the periphery thereof. The distance Wg between the adjacent electromagnetic coils 42 is set so as to be substantially equal to the value obtained by dividing the width dimension Wc of the electromagnetic coils 42 in the reciprocating direction by the number n of the electromagnetic coils (Wg = Wc /). n). In the present embodiment, the three electromagnetic coils 42 are housed in the tubular portion 8 of the main body case 1 so as to be arranged at predetermined intervals in the axial direction of the piston member 2. More specifically, each electromagnetic coil 42 is provided inside the tubular portion 8 at a position on the tip side in the axial direction from the magnetic field line shielding plate 10.

The position detection unit 5 constituting the formwork vibration device 100 plays a role of detecting the position of the piston member 2 in the reciprocating direction. As shown in FIG. 1, the position detection unit 5 includes a position detection permanent magnet 51, a pair of Hall sensors 52 (corresponding to the “position sensor” of claim 3), and a second spacer 53. ing.

The position detection permanent magnet 51 is a permanent magnet having a cylindrical shape and having an N pole on one side in the axial direction and an S pole on the other side. The position detection permanent magnet 51 is inserted into the piston body 20 of the piston member 2 so that it is located at the axial base end of the piston member 2, that is, the end opposite to the weight 21. ..

The pair of Hall sensors 52 play a role of detecting the current position of the piston member 2 in the reciprocating direction by detecting the magnetic field generated by the position detection permanent magnet 51. The pair of Hall sensors 52 are non-contact magnetic sensors that convert a magnetic field into an electric signal and output it by utilizing the so-called Hall effect. The pair of Hall sensors 52 are housed in the tubular portion 8 of the main body case 1 in a state of being separated by a predetermined distance in the reciprocating direction of the piston member 2. More specifically, a flat plate-shaped sensor holding plate 54 is arranged parallel to the axial direction of the tubular portion 8 at a position inside the tubular portion 8 and on the rear end side in the axial direction of the magnetic field line shielding plate 10. Has been done. One of the pair of Hall sensors 52 is attached to the front end of the sensor holding plate 54 in the reciprocating direction, and the other is attached to the rear end of the sensor holding plate 54 in the reciprocating direction.

The second spacer 53 serves to separate the position detection permanent magnet 51 from the driving permanent magnet 41. The second spacer 53 is a member made of a non-magnetic material or a diamagnetic material and having a cylindrical shape. In the present embodiment, a rod-shaped member made of hard plastic is used as the second spacer 53. The second spacer 53 configured in this way is arranged so as to fill the gap between the position detecting permanent magnet 51 and the driving permanent magnet 41.

The operating lever 6 constituting the formwork vibrating device 100 plays a role of changing the voltage value applied to the electromagnetic coil 42 of the drive unit 4. As shown in FIG. 1, the operating lever 6 is provided on the grip portion 11 of the main body case 1. When no external force acts, the operating lever 6 is urged by a spring or the like (not shown) so that the operating lever 6 projects to the outside of the grip portion 11. On the other hand, when the user who grips the grip portion 11 pushes the operation lever 6 against the urging force of the spring or the like, the operation lever 6 is immersed in the inside of the grip portion 11. Although details are not shown in the figure, the voltage value applied to the electromagnetic coil 42 changes as the resistance value changes according to the operation of the operating lever 6.

The control circuit 7 constituting the formwork vibration device 100 plays a role of controlling the operation of the drive unit 4 based on the outputs of the position detection unit 5 and the operation lever 6. Although the details are not shown in the figure, the control circuit 7 is composed of a CPU, a memory, a non-volatile storage unit, and the like. As shown in FIG. 1, the control circuit 7 is arranged inside the tubular portion 8 at a position on the rear end side in the axial direction from the magnetic field line shielding plate 10.

(How to use the formwork vibrating device and its action and effect)
Next, a method of using the formwork vibrating device 100 according to the embodiment of the present invention and its action and effect will be described. First, when the operation lever 6 is not pressed, the control circuit 7 stops the supply of power from the rechargeable battery 15 to the electromagnetic coil 42. As a result, no current flows through the electromagnetic coil 42, and no propulsive force acts on the piston member 2 in the reciprocating direction. Therefore, the piston member 2 is stopped at a predetermined position.

When the user presses the operation lever 6 while the piston member 2 is stopped, the control circuit 7 starts supplying power from the rechargeable battery 15 to the electromagnetic coil 42. At this time, the control circuit 7 controls the direction of the current flowing through the electromagnetic coil 42 so that an electromagnetic force acting forward in the reciprocating direction acts on the piston member 2. More specifically, the control circuit 7 determines which driving permanent magnet 41 is currently in close proximity to each of the three electromagnetic coils 42. Then, depending on the result, an electromagnetic force acting forward in the reciprocating direction acts on all of the driving permanent magnets 41 adjacent to each of the electromagnetic coils 42, or rearward in the reciprocating direction with respect to all of them. Each electromagnetic coil 42 is energized so that an electromagnetic force toward the direction acts. After that, when the control circuit 7 detects that the piston member 2 has advanced or retracted by a predetermined distance (the total value Wc + Wg of the width dimension Wc of the electromagnetic coil 42 and the distance Wg of the adjacent electromagnetic coil 42), it is used for driving. It is determined that the permanent magnet 41 has moved from the position of the electromagnetic coil 42 that was initially determined to be in close proximity to the position close to the adjacent electromagnetic coil 42. As a result, the control circuit 7 sequentially switches the polarity of each electromagnetic coil 42 by sequentially reversing the direction of energization of each electromagnetic coil 42. In this way, as the piston member 2 moves forward or backward, the control circuit 7 sequentially energizes the plurality of electromagnetic coils 42, and by switching the polarity of each electromagnetic coil 42, the piston member 2 moves in the reciprocating direction. To do.

Further, in the control circuit 7, when the current position of the piston member 2 detected by the pair of Hall sensors 52 reaches the frontmost position in the reciprocating direction, the control circuit 7 moves backward in the reciprocating direction with respect to the piston member 2. The direction of the current flowing through the electromagnetic coil 42 is controlled so that the toward electromagnetic force acts. That is, as in the case of advancing the piston member 2, the control circuit 7 sequentially energizes the plurality of electromagnetic coils 42, and by switching the polarity of each electromagnetic coil 42, the piston member 2 retreats in the reciprocating direction. Then, when the current position of the piston member 2 detected by the pair of Hall sensors 52 reaches the rearmost position in the reciprocating direction (shown by the two-point chain line in FIG. 1), the control circuit 7 refers to the piston member 2 with respect to the piston member 2. The direction of the current flowing through the electromagnetic coil 42 is controlled so that an electromagnetic force moving forward in the reciprocating direction acts. As a result, the piston member 2 advances in the reciprocating direction. In this way, while the user presses the operating lever 6, the piston member 2 reciprocates by repeating forward and backward movements.

Further, the user can change the reciprocating speed of the piston member 2 by operating the operating lever 6. Specifically, when the user presses the operation lever 6 with a weak force, the reciprocating speed of the piston member 2 becomes slower by reducing the voltage value applied to the electromagnetic coil 42 by the control circuit 7, and the control circuit. The speed at which 7 switches the polarity of the electromagnetic coil 42 becomes slower. As a result, the piston member 2 reciprocates at a low speed. On the other hand, when the user presses the operation lever 6 with a strong force, the reciprocating speed of the piston member 2 becomes faster by increasing the voltage value applied to the electromagnetic coil 42 by the control circuit 7, and the control circuit 7 becomes electromagnetic. The speed at which the polarity of the coil 42 is switched increases. As a result, the piston member 2 reciprocates at high speed.

As described above, according to the formwork vibrating device 100 according to the embodiment of the present invention, the piston member 2 reciprocates according to the principle of the so-called linear motor, and the weight portion 21 provided at the tip thereof collides with the formwork K. As a result, the mold K vibrates. Therefore, according to the formwork vibrating device 100, the formwork K can be struck and vibrated with a constant force magnitude and number of times regardless of the skill level and fatigue level of the user. Further, according to the formwork vibrating device 100, it is not necessary to install a compressed air supply device at the site and connect the compressed air supply device and the formwork vibrating device with a high pressure hose unlike the formwork vibrating device of Patent Document 2 described above. , It is easy to install and carry. Therefore, the user can efficiently perform the work of vibrating the mold K while moving to an arbitrary place.

Further, since the weight portion 21 constituting the piston member 2 is made of metal, hard rubber, plastic or the like, which is a material harder than the wooden form K, the form K is vibrated by the collision with the form K. Cheap. Further, since the tip surface 212 of the weight portion 21 is formed on a flat surface, the form K is less likely to be damaged when it collides with the form K. Further, since the weight portion 21 is detachably provided at the tip of the piston main body portion 20, the user can easily vibrate the mold K or damage the mold K depending on the material of the mold K. It can be replaced with the part 21. Further, the weight portion 21 is made into the piston member 2 by screwing the male screw formed on the outer peripheral surface of the protrusion 201 with the female screw formed on the inner peripheral surface of the concave groove 211 or releasing the screwing. It can be easily attached to and detached from the tip of the.

Further, the tip portion of the piston cover 3 in the protruding direction is located 1 to 5 mm behind the tip portion when the weight portion 21 is most advanced in the reciprocating direction in the reciprocating direction. That is, when the weight portion 21 moves forward most in the reciprocating direction, the tip portion of the weight portion 21 projects forward by 1 to 5 mm in the reciprocating direction from the tip portion in the protruding direction of the piston cover 3. Therefore, if the user presses the tip of the piston cover 3 in the protruding direction against the portion of the mold K to be vibrated, the weight portion 21 can give an impact of a certain magnitude to vibrate the mold K. ..

Further, the regulating portion 33 of the piston cover 3 regulates the forward movement of the flange portion 22 of the piston member 2 in the reciprocating direction. Therefore, when the weight portion 21 advances in the reciprocating direction, it is restricted that the tip portion of the weight portion 21 protrudes forward from the protrusion direction tip portion of the piston cover 3 beyond a predetermined position. As a result, it is possible to prevent the formwork K from being damaged due to an unexpectedly large impact.

Further, since the portion of the piston member 2 protruding from the main body case 1 is covered with the piston cover 3, it is possible to prevent the user from coming into contact with the reciprocating piston member 2 and being injured.

Further, a plurality of air holes 311 are formed by penetrating the vicinity position of the main body case 1 in the piston cover 3 in the thickness direction. Therefore, when the piston member 2 retreats in the reciprocating direction, the air inside the piston cover 3 is pressed by the flange portion 22 and the like, and is discharged from the air hole 311 to the outside of the piston cover 3. As a result, the air resistance received by the piston member 2 is reduced, so that the piston member 2 can be smoothly retracted. Further, there is an advantage that foreign matter such as dust that has entered the inside of the piston cover 3 is discharged to the outside through the air hole 311 together with the air inside the piston cover 3.

(Modification example)
The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention defined by the claims. .. For example, as an embodiment of the present invention, the following modifications can be considered.

(1) In the present embodiment, the battery accommodating portion 12 is detachably provided with respect to the main body case 1, so that the rechargeable battery 15 together with the battery accommodating portion 12 is removed from the main body case 1 and the rechargeable battery 15 is replaced. However, instead of this, the rechargeable battery 15 may be replaced by providing the battery accommodating portion 12 integrally with the main body case 1 and removing only the rechargeable battery 15 from the battery accommodating portion 12. Further, instead of the rechargeable battery 15 of the present embodiment, a dry battery, a button battery, or the like may be accommodated in the battery accommodating portion 12. Further, as a means for supplying power to the drive unit 4 or the like, commercial electricity or an external power source may be used instead of the rechargeable battery 15 of the present embodiment.

(2) In the present embodiment, a pair of hall sensors 52 are used as the position sensors according to the present invention. However, as a means for detecting the magnetic field generated by the position detection permanent magnet 51, it is possible to use another conventionally known magnetic sensor instead of the Hall sensor 52. Further, a so-called photoelectric sensor may be used as the position sensor, and the current position of the piston member 2 in the reciprocating direction may be detected by irradiating the piston member 2 with light from the photoelectric sensor and detecting the reflected light or the like. In that case, instead of the position detection permanent magnet 51, the piston member 2 may be provided with a rib or the like for reflecting light.

(3) In the present embodiment, the control circuit 7 changes the reciprocating speed of the piston member 2 by changing the voltage value applied to the electromagnetic coil 42 in response to the operation of the operation lever 6 by the user. However, when the waveform of the voltage applied to the electromagnetic coil 42 is a pulse wave, a sine wave, or the like, the control circuit 7 changes the period of the voltage applied to the electromagnetic coil 42 instead of the voltage value, so that the piston member The reciprocating speed of 2 may be changed. Further, the control circuit 7 may change the reciprocating speed of the piston member 2 by changing both the voltage value applied to the electromagnetic coil 42 and the period of the voltage.

(4) In the present embodiment, in order to prevent the formwork K from being damaged, the tip surface 212 of the weight portion 21 constituting the piston member 2 is formed on a flat surface. However, the same effect can be obtained by forming the tip surface 212 of the weight portion 21 on, for example, a convex curved surface instead of the flat surface.

(5) In the present embodiment, the drive unit 4 is composed of five drive permanent magnets 41, four first spacers 43, and three electromagnetic coils 42. However, the number of the driving permanent magnet 41, the first spacer 43, and the electromagnetic coil 42 is not limited to this embodiment, and the design can be changed as appropriate.

(6) In the present embodiment, the control circuit 7 is arranged inside the tubular portion 8 at a position on the rear end side in the axial direction from the magnetic field line shielding plate 10. However, the arrangement position of the control circuit 7 in the main body case 1 is not limited to this embodiment, and for example, the control circuit 7 can be arranged inside the grip portion 11.

The present invention can also be applied to applications for vibrating objects other than molds.

1 Main body case 2 Piston member 3 Piston cover 7 Control circuit 12 Battery housing 21 Weight 22 Flange 33 Regulation 41 Drive permanent magnet 42 Electromagnetic coil 52 Hall sensor (position sensor, magnetic sensor)
100 Formwork vibrating device 311 Air hole K Formwork Lm Length dimension (Permanent magnet for driving 41)
Ts thickness dimension (first spacer 43)
Wc width dimension (electromagnetic coil 42)
Wg interval (electromagnetic coil 42)

Claims (13)

A formwork vibrating device for vibrating a formwork for placing concrete.
A piston member that is supported so as to be reciprocating and has a weight portion that collides with the mold at the front end portion in the reciprocating direction.
A plurality of drive permanent magnets attached to the piston member so as to line up in the reciprocating direction,
An electromagnetic coil provided so as to be separated from the piston member and surround the piston member,
A control circuit that switches the polarity of the electromagnetic coil and
A formwork vibrating device characterized by being provided with. The control circuit is characterized in that the speed at which the polarity of the electromagnetic coil is switched can be changed by changing at least one of the voltage value applied to the electromagnetic coil and the period of the voltage. The formwork vibrating device described in. According to claim 1 or 2, the control circuit further includes a position sensor that detects the position of the piston member in the reciprocating direction, and the control circuit switches the polarity of the electromagnetic coil based on the output from the position sensor. The formwork vibrating device described. The mold vibrating device according to claim 3, wherein a position detecting permanent magnet is attached to the piston member, and the position sensor is a magnetic sensor that detects a magnetic field generated by the position detecting permanent magnet. A claim characterized in that a main body case for supporting the piston member in a reciprocating manner is further provided by accommodating a portion to which the driving permanent magnet is attached and projecting the weight portion to the outside. The formwork vibrating device according to any one of items 1 to 4. The mold vibrating device according to claim 5, wherein the main body case has a battery accommodating portion capable of accommodating a battery that supplies power to the electromagnetic coil. The fifth or sixth aspect of the present invention, wherein a tubular piston cover that covers a portion of the piston member that protrudes to the outside of the main body case is provided so as to protrude from the main body case in the reciprocating direction. Formwork vibrating device. The mold according to claim 7, wherein the tip of the piston cover in the protruding direction is located rearward by a predetermined distance in the reciprocating direction from the tip when the weight is most advanced in the reciprocating direction. Vibration device. A flange portion is provided so as to project from the piston member toward the piston cover, and the flange portion projects from the inner side surface of the piston cover toward the piston member to regulate the forward movement of the flange portion in the reciprocating direction. The mold vibrating device according to claim 7 or 8, wherein the portion is provided. The mold vibrating device according to any one of claims 7 to 9, wherein an air hole is formed by penetrating a position in the vicinity of the main body case in the piston cover in the thickness direction. The mold vibrating device according to any one of claims 1 to 10, wherein the weight portion has a portion that collides with the mold formed on a flat surface or a convex curved surface. Spacers made of magnetic material are provided between the adjacent permanent magnets for driving, and the width dimension in the reciprocating direction of the electromagnetic coil is the length dimension in the reciprocating direction of the permanent magnet for driving and the reciprocating of the spacer. The mold vibrating device according to any one of claims 1 to 11, wherein the value is substantially equal to the total value with the thickness dimension in the moving direction. A claim characterized in that a plurality of the electromagnetic coils are provided in the reciprocating direction, and the distance between adjacent electromagnetic coils is substantially equal to a value obtained by dividing the width dimension of the electromagnetic coils in the reciprocating direction by the number of the electromagnetic coils. Item 12. The formwork vibrating device according to Item 12.

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