Aggregate preheating system for mixing plants

Abstract

The utility model discloses a sand and gravel preheating system for a mixing station, comprising a windproof chamber, an electric heating unit and a control unit arranged in a mixing station plant, wherein the electric heating unit is buried in the plant floor located in the windproof chamber, and the electric heating unit comprises a cable heating line evenly spaced in the plant floor; the control unit comprises a plurality of temperature sensors arranged in the windproof chamber and a controller with a display screen, wherein the temperature signal output end of the temperature sensor is electrically connected to the temperature signal input end of the controller, and the display signal output end of the controller is electrically connected to the display signal input end of the display screen. The utility model arranges a plurality of temperature sensors in the windproof chamber, and can comprehensively determine whether to turn on the cable heating line according to the temperature values ​​detected by the temperature sensors at different positions, and the cable heating line is powered off when the temperature is higher than the maximum limit, and the cable heating line is powered on for heating when the temperature at a certain position is higher than the minimum limit; the cable heating line is combined with the windproof chamber, which can reduce heat loss and directly heat the raw materials, and the heat utilization rate is as high as 90%, thereby reducing the heating energy consumption and heating cost of the raw materials, and the energy saving effect is remarkable.

Description

Technical Field

[0001] The utility model relates to sand and gravel mixing, in particular to a sand and gravel preheating system used in a mixing station. Background Art

[0002] During winter construction, in order to ensure that the temperature of concrete leaving the machine is not less than 10°C, it is often necessary to take certain measures to heat the raw materials of concrete before mixing. The raw materials of concrete with the largest consumption are sand, gravel, etc., which are mostly mixed in the factory and heated by hot air guns, electric heaters, etc. However, the factory buildings of existing mixing plants are often large in area. The interior of the factory is divided into storage areas for different materials by partitions of 3m to 6m in height. Due to the large height difference between the partitions and the roof of the factory, the heat dissipation of heating solutions such as hot air guns and electric heaters is relatively large, the heating efficiency is low, the heat loss is large, the energy consumption is high, and the heating cost is high, which seriously restricts the production speed of concrete, and there are equipment idleness and even concrete cannot be supplied in time. Summary of the invention

[0003] In view of this, the utility model proposes a sand and gravel preheating system for a mixing station, in which a closed windproof room is enclosed in the sand stacking area in the mixing station plant, and a cable heating wire is laid in the bottom plate of the windproof room. The combination of the windproof room and the cable heating wire greatly improves the heat utilization rate.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The sand and gravel preheating system for a mixing plant described in the utility model comprises a windproof chamber, an electric heating unit and a control unit arranged in a plant building of the mixing plant, wherein the electric heating unit is buried in a plant floor located in the windproof chamber, and the electric heating unit comprises cable heating wires evenly spaced in the plant floor;

[0006] The windproof room comprises three side walls, a heat-insulating roof arranged on the top of the side walls, and a heat-insulating door curtain arranged between one pair of the side walls, the side walls are composed of a factory partition wall and a light steel partition wall fixed on the factory partition wall, the top surfaces of the three light steel partition walls have a horizontally arranged steel wire support net, and the heat-insulating roof is laid on the steel wire support net; a crossbeam is arranged between one pair of the side walls, and the heat-insulating door curtain is arranged and fixed on the crossbeam;

[0007] The control unit includes a plurality of temperature sensors arranged in the windproof chamber and a controller with a display screen, the temperature signal output end of the temperature sensor is electrically connected to the temperature signal input end of the controller, and the display signal output end of the controller is electrically connected to the display signal input end of the display screen;

[0008] Among them, multiple temperature sensors are respectively arranged in the lower part, middle part and upper part of the windproof chamber, and are used to collect the temperature of the bottom of the material, the inside of the material and the space above the windproof chamber respectively.

[0009] The beneficial effect is: the utility model sets a plurality of temperature sensors in the windproof chamber, and can comprehensively determine whether to turn on the cable heating line according to the temperature values ​​detected by the temperature sensors at different positions, such as determining the minimum temperature according to the temperature of the upper part of the windproof chamber, and determining the maximum temperature according to the internal temperature of the material, and using the ground temperature as a reference to avoid the temperature of individual parts of the raw materials being too high and exceeding the standard value. When the internal temperature of the sand and gravel is higher than the maximum limit, the cable heating line is powered off, and when the temperature of the space above the windproof chamber is lower than the minimum limit, the cable heating line is powered on for heating; the combination of the cable heating line and the windproof chamber can reduce heat loss and directly heat the raw materials, with a heat utilization rate of up to 90%, thereby reducing the heating energy consumption and heating cost of the raw materials, and the energy-saving effect is significant.

[0010] In addition, the utility model uses the existing partition walls of the mixing station building to enclose a sealed space with an insulation roof, effectively reducing heat loss; the windproof room and the cable heating line are combined to improve the heat utilization rate. In the actual supply project, if there are only two existing partition walls in the mixing station building, and the third side wall can be directly used as a light steel partition wall to meet the fixing requirements of the steel wire support net and the beam.

[0011] Preferably, a support frame is further provided on the top of the three side walls, the support frame includes a plurality of columns provided on each side wall and a horizontal beam connecting the plurality of columns together, the steel wire support net is fixed on the support frame, and the cross beam is horizontally fixed on one pair of horizontal beams. The utility model provides a support frame on the top of the side wall, which can not only reduce the amount of light steel partition wall and reduce the investment cost, but also ensure the height of the windproof room, thereby meeting the entry and exit requirements of the forklift.

[0012] Preferably, the steel wire support mesh comprises a plurality of parallel longitudinal steel wires and a plurality of parallel transverse steel wires, the diameters of the longitudinal steel wires and the transverse steel wires are ≥8 mm, the spacing between two adjacent longitudinal steel wires is 1.5 m to 3.0 m, and the spacing between two adjacent transverse steel wires is 1.5 m to 3.0 m.

[0013] Preferably, an S-shaped installation groove is provided on the floor of the plant, a heat insulation layer is provided in the installation groove, the cable heating wire is laid in the installation groove along the direction of the installation groove, and the heat insulation layer separates the cable heating wire from the concrete below the installation groove. In actual engineering, the cable heating wires are laid out at equal intervals to ensure uniform heating.

[0014] Preferably, the cable heating wire is one or more cables connected in parallel. When there is only one cable heating wire, the heating of the entire area can be realized by energizing the cable heating wire; when there are multiple cables connected in parallel, the on-off status of each cable heating wire is controlled to control the heating status of the corresponding area, so that partial heating can be realized, further reducing energy consumption. During actual installation, a control cabinet can be installed on the partition wall outside the thermal insulation curtain, and the control cabinet has a manual button switch for the cable heating wire; in addition, a controller is set in the control cabinet, and the control input end of the cable heating wire is connected to the control output end of the controller, and the controller can be used to realize automatic control of the cable heating wire.

[0015] Compared with the prior art, the utility model arranges multiple temperature sensors in the windproof chamber, and can comprehensively determine whether to turn on the cable heating wire according to the temperature values ​​detected by the temperature sensors at different positions. When the temperature is higher than the maximum limit, the cable heating wire is powered off, and when the temperature at a certain position is higher than the minimum limit, the cable heating wire is powered on for heating. The combination of the cable heating wire and the windproof chamber can reduce heat loss and directly heat the raw materials. The heat utilization rate is as high as 90%, the heating efficiency is high, the heating energy consumption and heating cost of the raw materials are reduced, and the energy-saving effect is remarkable.

[0016] In addition, since the cable heating method is relatively safe, it reduces safety accidents; the heating method that combines a windproof chamber and a cable heating wire has a low one-time investment and less manual intervention in the heating process, which reduces labor costs, does not affect the normal operation of the equipment, reduces equipment idleness, and thereby increases concrete production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the utility model.

[0018] Figure 2 yes Figure 1 AA direction schematic diagram.

[0019] Figure 3 yes Figure 2 Enlarged view of point B in the middle.

[0020] Figure 4 This is the layout diagram of the cable heating line.

[0021] Figure 5 This is another schematic diagram of the layout of cable heating wires.

[0022] Figure 6 It is a circuit principle block diagram of the utility model. DETAILED DESCRIPTION

[0023] The following is a detailed description of an embodiment of the utility model in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the utility model, and a detailed implementation method and a specific operation process are given, but the protection scope of the utility model is not limited to the following embodiment.

[0024] It should be noted that, in the description of the present utility model, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0025] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connection" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] like Figure 1-4 As shown, the sand and gravel preheating system for a mixing plant described in the utility model comprises a windproof chamber 1, an electric heating unit and a control unit arranged in a mixing plant building. The windproof chamber 1 comprises three side walls 1.1, a heat-insulating roof 1.2 (using a plastic film) arranged on the top of the side walls 1.1 and a heat-insulating door curtain 1.3 arranged between one pair of the side walls 1.1. Each side wall 1.1 is composed of an existing partition wall 1.1a of the plant building and a light steel partition wall 1.1b fixed on the existing partition wall 1.1a. The height of the existing partition wall 1.1a is increased to facilitate the installation of the heat-insulating roof 1.2 described later.

[0027] A support frame 1.4 is also installed on each side wall 1.1. The support frame 1.4 includes a plurality of columns on each side wall 1.1 and a horizontal beam connecting the plurality of columns together. The support frame can effectively reduce the steel consumption of the square steel partition wall, thereby reducing the investment cost of the windproof room; a steel wire support net is installed on the support frame 1.4, and an insulation roof 1.2 is covered on the steel wire support net and the support frame 1.4; a crossbeam 1.5 higher than a forklift is fixed on the horizontal beam above one pair of side walls 1.1, and an insulation door curtain 1.3 is installed on the crossbeam 1.5. The insulation door curtain 1.3 is a sliced ​​structure or a push-pull structure, which is convenient for the forklift to enter and exit;

[0028] The insulation roof 1.2, the side wall 1.1 and the cross beam 1.5 form a relatively sealed space to reduce heat loss. Since the top of the light steel partition wall 1.1b is equipped with a support frame 1.4 with a certain height, it not only reduces the amount of light steel partition wall 1.1b and reduces the investment cost, but also ensures the height of the windproof room 1 to meet the requirements of forklifts entering and exiting.

[0029] Of course, in actual construction, if there is no partition wall in the mixing plant, three light steel walls can be directly constructed, and the support frame 1.4 can be installed on the top of the light steel wall. If there are less than three existing partition walls 1.1a, light steel walls can be directly constructed at other locations, and then the support frame 1.4 can be constructed. The construction can be flexible according to the situation of the plant itself.

[0030] Combination Figure 1 and Figure 2 It can be seen that the steel wire support net includes multiple parallel longitudinal steel wires 1.6a and multiple parallel transverse steel wires 1.6b. The transverse steel wires 1.6b are installed in tension with each other and the spacing between two adjacent transverse steel wires 1.6b is 2.0m. The longitudinal steel wires 1.6a are installed in tension with each other and the spacing between two adjacent longitudinal steel wires 1.6a is 2.0m. The transverse steel wires 1.6b and the longitudinal steel wires 1.6a are crisscrossed to form a steel wire support net for supporting the insulation top 1.2. Since the top of the side wall 1.1 has a support frame 1.4, three edges of the insulation top 1.2 have downward edging, and the bottom of the edging is fixed to the top of the side wall 1.1 to avoid air leakage.

[0031] During actual construction, the insulation roof 1.2 uses a plastic film with a thickness of 3 mm; the insulation door curtain 1.3 uses a thickened insulation cotton door curtain. Of course, insulation blankets and glass wool can also be used.

[0032] Combination Figure 2 and Figure 3-4 It can be seen that the electric heating unit is buried in the factory floor located in the windproof chamber 1, and the electric heating unit includes a cable heating line 2 evenly spaced in the factory floor; the factory floor (i.e., the concrete floor) located in the windproof chamber 1 is provided with an S-shaped installation groove 3, and a leather insulation layer (i.e., tinfoil film 4) is laid on the installation groove 3 and the concrete floor of the factory to isolate the heat from transferring downward; then the cable heating line 2 is fixed in the installation groove 3 according to the direction of the installation groove 3. Among them, the installation groove 3 has a transverse part and a longitudinal part, the longitudinal part is arranged at equal intervals, and the transverse parts are respectively located on both sides of the longitudinal part and are staggered to connect the longitudinal parts together. Of course, in actual construction, the transverse parts can also be arranged at equal intervals, and the longitudinal parts can be respectively located on both sides of the transverse part and are staggered to connect the transverse parts together, see for details. Figure 5 .

[0033] Combination Figure 3 It can be seen that after the cable heating wire 2 is laid, grouting is poured into the installation groove 3, and another layer of concrete is poured on the concrete bottom surface to completely cover the tinfoil film 4 and the cable heating wire 2 to protect the tinfoil film 4 and the cable heating wire 2; the power terminal of the cable heating wire 2 is led out of the factory floor and connected to the power supply.

[0034] In actual projects, the cable heating wires in the windproof chamber 1 can be one or multiple in parallel. When there is only one cable heating wire, the heating of the entire area can be realized by energizing the cable heating wire; when there are multiple cable heating wires in parallel, the heating of the corresponding area can be controlled by controlling the on-off status of each cable heating wire, so that partial heating can be realized, further reducing energy consumption.

[0035] Combination Figure 2 and Figure 6 It can be seen that the control unit includes three temperature sensors 6 arranged in the windproof chamber 1 and a controller with a display screen. The temperature signal output end of the temperature sensor 6 is electrically connected to the temperature signal input end of the controller, and the display signal output end of the controller is electrically connected to the display signal input end of the display screen, so that the temperature at each position can be displayed through the display; the three temperature sensors 6 are respectively arranged at the bottom, middle and upper part of the windproof chamber 1, and are respectively used to collect the temperature of the ground of the windproof chamber 1, the middle of the material and the upper space of the windproof chamber 1, so as to provide basic data for the heating of the cable heating wire 2. Among them, the minimum temperature (such as 10°C) is set based on the temperature of the upper part of the windproof chamber 1, the maximum temperature (such as 25°C) is set based on the temperature of the middle of the material, and the ground temperature of the windproof chamber 1 is used as a reference to avoid excessive temperature in some parts. During actual installation, a control cabinet 5 is installed on the partition wall outside the thermal insulation curtain 1.3. The control cabinet 5 is provided with a manual button switch of the cable heating wire 2, which manually controls the power on and off of the cable heating wire 2. The controller is arranged in the control cabinet 5, and the control input end of the cable heating wire 2 is connected to the control output end of the controller. The controller can be used to control the automatic control of the cable heating wire 2, that is, the power on condition of the cable heating wire 2 can be controlled manually or automatically.

[0036] In actual projects, the cable heating wire 2 is connected in parallel in one or more ways. When the cable heating wire is connected in one way, the heating of the entire area can be realized by energizing the cable heating wire 2; when the cable heating wire is connected in parallel in multiple ways, the heating of the corresponding area can be controlled by controlling the on-off status of each cable heating wire, so as to realize partial heating and further reduce energy consumption. The specific method can be determined according to the storage characteristics of the materials.

[0037] The construction process of the utility model is as follows: construct a light steel partition wall 1.1b on the existing partition wall 1.1a in the sand storage area, the light steel partition wall 1.1b is about 1m high, and a support frame 1.4 is installed on the top of the light steel partition wall 1.1b; a cross beam 1.5 is installed between a pair of horizontal beams of the support frame 1.4, and then an insulation roof 1.2 and an insulation door curtain 1.3 are installed;

[0038] A groove (i.e., installation groove 3) is opened in the floor of the windproof chamber 1, tinfoil film 4 is laid in the installation groove 3 and on the concrete floor, the cable heating wire 2 is laid and its power terminal is led out to the control cabinet 5; grout is poured into the installation groove 3 and on the surface of the tinfoil film 4, and the cable heating wire 2 and the tinfoil film 4 are completely covered after the slurry solidifies; three temperature sensors 6 are installed in the windproof chamber 1, and the temperature sensors 6 are connected to the controller in the control cabinet 5.

[0039] During operation, when the temperature of the upper part of the windproof chamber 1 is lower than the minimum limit, the cable heating wire 2 is powered on for heating (either manually or automatically), and the cable heating wire 2 transfers the heat to the ground, and then transfers the heat to the sand through the ground. That is, the principle of heat rising is used to heat the sand evenly, and the heat utilization rate is as high as 90%, thereby improving the heating efficiency. When the internal temperature of the sand reaches the maximum temperature value, the cable heating wire 2 is manually or automatically powered off to stop heating.

[0040] Taking sand as an example, the utility model forms a relatively closed space in the sand storage area to reduce heat loss; the cable heating wire 2 is laid under the ground, and the raw materials can be evenly heated by using the principle of heat rise, and the heat utilization rate is as high as 90%, which improves the heating efficiency and reduces the heating cost. In addition, since the cable heating method is relatively safe, safety accidents are reduced; the heating method combining the windproof chamber 1 and the cable heating wire 2 has a low one-time investment, less manual intervention in the heating process, reduces labor costs, does not affect the normal operation of the equipment, reduces equipment idleness, and thus increases the output of concrete.

[0041] It should be pointed out that the controller in the present invention can be a general-purpose processor, a special-purpose processor, a conventional processor, a digital signal processor (DSP), multiple microprocessors, one or more microprocessors associated with a DSP core, a controller, a microcontroller, an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) circuit; it can also be a programmable logic controller (PLC) or an industrial computer; the controller can also be provided with a wireless communication module to achieve connection with a remote terminal, receive control instructions from the remote terminal, and also feedback relevant parameters of the real-time working status.

[0042] Finally, it should be emphasized that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Therefore, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A sand and gravel preheating system for a mixing plant, characterized in that: It includes a windproof chamber, an electric heating unit and a control unit arranged in a mixing station plant, wherein the electric heating unit is buried in a plant floor located in the windproof chamber, and the electric heating unit includes cable heating wires evenly spaced and arranged in the plant floor; The windproof room comprises three side walls, a heat-insulating roof arranged on the top of the side walls, and a heat-insulating door curtain arranged between one pair of the side walls, the side walls are composed of a factory partition wall and a light steel partition wall fixed on the factory partition wall, the top surfaces of the three light steel partition walls have a horizontally arranged steel wire support net, and the heat-insulating roof is laid on the steel wire support net; a crossbeam is arranged between one pair of the side walls, and the heat-insulating door curtain is arranged and fixed on the crossbeam; The control unit includes a plurality of temperature sensors arranged in the windproof chamber and a controller with a display screen, the temperature signal output end of the temperature sensor is electrically connected to the temperature signal input end of the controller, and the display signal output end of the controller is electrically connected to the display signal input end of the display screen; Among them, multiple temperature sensors are respectively arranged in the lower part, middle part and upper part of the windproof chamber, and are used to collect the temperature of the bottom of the material, the inside of the material and the space above the windproof chamber respectively.

2. The sand and gravel preheating system for a mixing plant according to claim 1, characterized in that: A support frame is also arranged on the top of the three side walls. The support frame includes a plurality of columns arranged on each side wall and a horizontal beam connecting the plurality of columns together. The steel wire support net is fixed on the support frame.

3. The sand and gravel preheating system for a mixing plant according to claim 1, characterized in that: The steel wire support net comprises a plurality of parallel longitudinal steel wires and a plurality of parallel transverse steel wires, the diameters of the longitudinal steel wires and the transverse steel wires are ≥8mm, the spacing between two adjacent longitudinal steel wires is 1.5m-3.0m, and the spacing between two adjacent transverse steel wires is 1.5m-3.0m.

4. The sand and gravel preheating system for a mixing plant according to claim 1, characterized in that: An S-shaped installation groove is provided on the floor of the plant building, a heat insulation layer is arranged in the installation groove, and the cable heating wire is laid in the installation groove along the direction of the installation groove, and the heat insulation layer separates the cable heating wire from the concrete below the installation groove.

5. The sand and gravel preheating system for a mixing plant according to claim 1, characterized in that: The cable heating wires are one or more wires connected in parallel.

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