Retrofit mixer stop unit

Abstract

To provide a retrofitting stop unit that can be easily retrofitted to an existing mixer and improves the safety of the mixer. [Solution] This is a retrofit mixer stop unit that can be attached to a mixer that mixes fluid materials for building construction using a mixing device inside a drum. It consists of a sensor device 21 that detects when the lid 15 that opens and closes the opening of the drum 11 has been opened, and a control device that cuts off power to the mixing device based on a signal emitted by the sensor body 22 of the sensor device 21. The control device body 32 can be installed on an existing mixer as a retrofit using appropriate fixing means.

Description

[Technical Field]

[0001] The present invention relates to a retrofit mixer stopping unit that can be retrofitted to a mixer that mixes cement-based materials and water in a drum to produce mortar or the like. [Background technology]

[0002] Conventionally, mixers that produce mortar or the like by mixing cement-based materials and water in a drum have been widely used at relatively small-scale construction and civil engineering sites. Patent Document 1 discloses a technology for improving safety by providing a lid that opens and closes the opening of the drum. However, these mixers generally do not have a mechanism for stopping the mixer when the lid is opened.

[0003] As described above, conventional mortar manufacturing mixers do not have a stop mechanism when the lid is removed, and therefore require extensive modifications to ensure the safety of workers and bystanders, or a new mortar manufacturing mixer must be ordered and designed each time, which is costly and time-consuming. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Publication number 7-51284 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to provide a retrofit stop unit that can be easily installed on existing mixers, thereby improving the safety of mixers currently in use. [Means for solving the problem]

[0006] The present invention provides a retrofit mixer stopping unit that can be retrofitted to a mixer that mixes flowable materials for building construction in a drum with an agitator. This retrofit mixer stopping unit is composed of a sensor device that detects when the lid that opens and closes the opening of the drum is opened, and a control device that cuts off power to the mixing device in response to a signal emitted by the sensor body of the sensor device. The sensor device includes the sensor body and a sensor mounting portion that fixes the sensor body to the outer wall of the drum. The lid is equipped with the detection dog and a positioning plate, and the sensor mounting portion is configured to fix the sensor body so that the detection surface of the sensor body faces the same direction as the opening of the drum.The detection dog is configured in a flat plate shape so as to cover the entire detection surface of the sensor body when the lid is closed, and the flat detection dog also serves as a dirt-proof cover for the sensor body. The sensor mounting part is provided with brackets protruding on both sides, and if the lid is installed so that the detection dog is located at a position other than between the brackets, the sensor body will not detect the detection dog, and the sensor can be installed as a retrofit on an existing mixer. [Effects of the Invention]

[0007] This invention provides a retrofit stop unit that can be easily installed on existing mixers, thereby improving the safety of mixers currently in use at low cost and with simple installation. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a main part of a mixer in an open lid state according to an embodiment of the present invention; [Figure 2] FIG. 2 is a perspective view of the main parts of the mixer with the lid closed. [Figure 3] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The retrofit mixer stopping unit according to the embodiment of the present invention is a retrofit mixer stopping unit that can be retrofitted to a completed mixer or a mixer that is already in use, particularly a mixer that produces mortar or the like by mixing cementitious materials and water in a drum 11 with a mixing device (not shown).

[0010] (About the mixer) A suitable mixer is one equipped with a cylindrical drum 11 with an opening 12 at the top, as in Patent Document 1. The mixing blades of a mixer (not shown) are located at the bottom of the opening 12, and the mixer (not shown) is rotated by an electric motor or the like located below the drum 11 to produce mortar by mixing the added cementitious material and fluid materials such as water. If a worker or an outsider inadvertently puts their hand in the mixer (not shown) while it is rotating, they may be caught in the mixer (not shown) and suffer an injury or other accident.

[0011] To prevent this accident, the lid 15 is often arranged to be removable and rotatable up and down, but this does not completely prevent accidents because if the lid 15 is opened, someone can easily put their hand inside.

[0012] (About Lid 15) As shown in Figure 3, the lid 15 is made of a mesh or plate-like body that is approximately circular and slightly larger than the opening 12 of the drum 11. In this example, the lid 15 is a removable, place-on lid that is not connected to the drum 11 by a hinge, and the worker grasps and lifts the lid 15 with both hands and places it near the drum 11 to remove it. To close the lid, the worker grasps and lifts the lid 15 with both hands and places it on the top of the drum 11. The lid 15 has a positioning plate 17 protruding radially outward from one outer periphery on its diameter, and a detection dog 16 protruding radially outward from the other outer periphery. The detection dog 16 and the positioning plate 17 may be prefabricated, or may be attached by welding, bolting, or other fixing parts after the implementation of the present invention. Also, an auxiliary member such as a guide rod 18 for positioning may be provided.

[0013] (Regarding the sensor device 21) The sensor device 21 comprises a sensor body 22 equipped with a non-contact sensor, such as an induction type, capacitance type, or magnetic type, generally called a proximity switch, and a sensor mounting part 23 for mounting the sensor body 22 to the upper end of the outer wall of the drum 11. The sensor mounting part 23 comprises a support plate 24 that supports the sensor body 22, and brackets 25 that are fixed to both the left and right sides of the support plate 24 and extend upward. The brackets 25 can be easily mounted by hooking the hook portions 26 at the upper ends of the brackets 25 onto the upper end of the outer wall of the drum 11, but they may also be mounted using other fastening devices such as bolts or other fixing means such as welding. The height at which bracket 25 protrudes from the upper end of the outer wall of drum 11 is set higher than the height of the detection range within which sensor body 22 can detect detection dog 16. As a result, if lid 15 is installed in an inappropriate position where detection dog 16 is located outside the space between brackets 25, such as at the upper end of one of brackets 25, sensor body 22 will not detect detection dog 16 even if lid 15 appears to be closed at first glance, and the agitating blades of the agitator (not shown) will not rotate, thereby increasing safety.

[0014] The sensor mounting portion 23 fixes the sensor main body 22 to the drum 11 so that the detection surface of the sensor main body 22 faces in the same direction as the opening 12 of the drum 11 (upward in the illustrated example). The detection dog 16 provided on the lid 15 is flat and large enough to cover the entire detection surface of the sensor body 22 when the lid 15 is closed, and is positioned in a position where it can cover the entire detection surface, and it is preferable that the detection dog 16 also serves as an anti-fouling cover for the sensor body 22. When the lid 15 is closed, the detection dog 16 fits between the brackets 25 on both the left and right sides of the sensor body 22, which prevents the lid 15 from shifting sideways and allows the lid 15 to reliably cover the detection surface of the sensor body 22.

[0015] (Regarding the control device 31) The control device 31 controls the mixing device (not shown) to cut off power supply in response to a signal sent from the sensor body 22, and the control device body 32 is attached to the drum 11 or the storage section below it for the electric motor, etc. This attachment may be by welding, or it may be attached to the mixer by suitable fixing means such as hooks, bolts, and nuts. The control device 31 includes an input unit 33, an output unit 34, and a power cord 35. The input unit 33 is connected to the sensor body 22 via a relay unit 36, the output unit 34 is connected to the motor of the stirring device (not shown) via the relay unit 36, and the power cord 35 is connected to an external power source.

[0016] When the lid 15 is lifted off the drum 11 or removed, the detection dog 16 is no longer detected by the sensor main body 22. When the proximity switch issues an OFF signal in this manner, the signal is sent to the control device 31 via the relay unit 36, and when the control device main body 32 receives the OFF signal from the input unit 33, it controls the power supply based on this signal. The control device main body 32 may be equipped with a CPU or may be composed of an electronic circuit. When the control device main body 32 receives the OFF signal, it cuts off the power sent from the power cord 35 to the electric motor via the output unit 34 and relay unit 36, cutting off power to the agitator (not shown) and stopping it. [Explanation of symbols]

[0017] 11: Drums 12: Opening 15: Lid 16: Detection dog 17: Positioning plate 18: Guide rod 21: Sensor device 22: Sensor body 23: Sensor mounting part 24: Support plate 25: Bracket 26: Hook part 31: Control device 32: Control device main body 33: Input section 34: Output section 35: Dengen Code 36: Relay section

Claims

1. A retrofit mixer stopping unit that can be retrofitted to a mixer that mixes fluid materials for building construction in a drum with an agitator, a sensor device that detects that a lid that opens and closes the opening of the drum has been opened, and a control device that cuts off power to the agitator in response to a signal emitted by a sensor body of the sensor device; the sensor device includes the sensor main body and a sensor mounting portion that fixes the sensor main body to the outer wall of the drum; the lid is provided with the detection dog and a positioning plate; the sensor mounting portion is configured to fix the sensor body so that a detection surface of the sensor body faces the same direction as the opening of the drum; the detection dog is configured in a flat plate shape so as to cover the entire detection surface of the sensor body when the lid is closed, and the flat plate-shaped detection dog also serves as an anti-fouling cover for the sensor body; The sensor mounting portion has brackets protruding from both sides, This retrofit mixer stopping unit is configured so that it can be retrofitted to an existing mixer by installing the lid so that the detection dog is in an inappropriate position other than between the brackets, so that the sensor main body does not detect the detection dog.

2. a protruding height of the bracket from the upper end of the outer wall of the drum is greater than a height of a detection range in which the sensor main body can detect the detection dog; 2. The post-installation mixer stopping unit according to claim 1, wherein the lid is a removable mounting lid that is not connected to the drum by a hinge.

3. 3. The retrofit mixer stopping unit according to claim 2, wherein the detection dog fits between the brackets on both sides when the lid is closed, thereby preventing the lid from shifting sideways.

4. 4. The retrofit mixer stopping unit according to claim 2, further comprising a positioning plate for preventing the lid from floating up, the positioning plate being disposed at a position away from the detection dog.

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