CN219239503U

CN219239503U - Defoaming auxiliary device

Info

Publication number: CN219239503U
Application number: CN202320567423.6U
Authority: CN
Inventors: 张献明; 王文勇; 黄才富; 曹联会; 罗建军; 吴道正; 袁伟; 武林雨
Original assignee: Guangxi Nanbo New Energy Material Technology Co ltd; CSG Holding Co Ltd
Current assignee: Guangxi Nanbo New Energy Material Technology Co ltd; CSG Holding Co Ltd
Priority date: 2023-03-21
Filing date: 2023-03-21
Publication date: 2023-06-23
Anticipated expiration: 2033-03-21

Abstract

The utility model discloses a defoaming auxiliary device which is used for assisting in eliminating bubbles in glass liquid in an overflow port and comprises the following components: a base; the moving piece is arranged on the base, moves in a direction approaching to the base or a direction separating from the base along a first direction, and one end of the moving piece stretches into the molten glass and contacts with the bubbles to pull the bubbles to one side of the overflow port; the driving assembly drives the moving piece to move along the first direction; and the base is installed on the lifting assembly. The defoaming auxiliary device can reduce the working strength of operators and improve the elimination precision of bubbles.

Description

Defoaming auxiliary device

Technical Field

The utility model relates to the technical field of production of photovoltaic glass, in particular to a defoaming auxiliary device.

Background

Photovoltaic glass, also known as "photovoltaic glass", is a special glass that presses in a solar photovoltaic module, can generate electricity by solar radiation, and has a related current lead-out device and a cable. The photovoltaic glass consists of glass, solar cells, films, back glass, special metal wires and the like, and is the most novel high-tech glass product for construction. The photovoltaic glass is generally prepared by adopting a calendaring method, molten glass is poured onto a calendaring forming table, rolled by a roller with patterns, annealed and cut, and the photovoltaic glass is applied to a photovoltaic module.

Before the calendaring operation is carried out on the molten glass by adopting a calendaring machine, bubbles in the molten glass are required to be treated, so that bubble scars are avoided from being generated on the formed glass. In the prior art, the treatment is usually performed manually. One operator observes the specific position of the bubble, the other operator holds the iron hook, the iron hook is placed in the molten glass before the roller, the observer is informed to instruct the position of the iron hook to move transversely, and the bubble is brought out by utilizing the temperature change of the molten glass before the iron hook. Operators need to stand at two sides of the glass liquid to treat the bubbles, and because the glass liquid is high in temperature, the field working environment is very severe, so that the labor intensity of the operators is high, and the elimination precision of the bubbles is difficult to ensure.

Disclosure of Invention

The present utility model aims to solve, at least to some extent, one of the problems of the prior art. Therefore, the utility model provides the defoaming auxiliary device, and the mechanical device is used for replacing manual operation, so that the working strength of operators can be reduced, and the elimination precision of bubbles can be improved.

According to one aspect of the utility model, a defoaming auxiliary device for assisting in eliminating bubbles in molten glass in an overflow port comprises:

a base;

the moving piece is arranged on the base, moves in a direction approaching to the base or a direction separating from the base along a first direction, and one end of the moving piece stretches into the molten glass and contacts with the bubbles to pull the bubbles to one side of the overflow port;

the driving assembly drives the moving piece to move along the first direction;

and the base is installed on the lifting assembly.

The defoaming auxiliary device provided by the utility model has the following beneficial effects: the working strength of operators can be reduced, and the elimination precision of bubbles is improved.

In some embodiments, the drive assembly includes a gear and a rack fixedly mounted to the base, the gear engaged with the rack, the gear moving on the rack in the first direction.

In some embodiments, the driving assembly further includes a rotating shaft, one end of the rotating shaft is penetrated through the gear through a bearing, one end of the rotating shaft is provided with a locking member, the locking member is provided with a plurality of mounting holes, the moving member is mounted in at least one of the plurality of mounting holes, and moves along the first direction along with the gear in a direction approaching to the base or a direction far from the base;

the other end of the rotating shaft is provided with a handheld part.

In some embodiments, the drive assembly includes a gear fixedly mounted to the base and a rack, the gear being in engagement with the rack;

the base is provided with a recess in which a portion of the rack is received, the rack moving in the first direction.

In some embodiments, the moving member is fixedly mounted to the rack, and moves together with the rack in the first direction in a direction approaching the base or in a direction separating from the base;

the gear is provided with a driving piece, and the driving piece drives the gear to rotate.

In some embodiments, the moving member is provided with a body portion and a contact portion, the contact portion being disposed perpendicular to the body portion;

the contact part is arranged at one end of the moving part far away from the driving assembly, stretches into the glass liquid, contacts with the bubbles, pulls the bubbles, and pulls the bubbles to one side of the overflow port.

In some embodiments, the moving member is fixed by a locking member, and an end of the moving member contacting the molten glass is provided in a tapered shape.

In some embodiments, a plurality of mounting holes are formed in the locking member at intervals along a second direction perpendicular to the first direction, and one end of the moving member is inserted into at least one of the plurality of mounting holes.

In some embodiments, the driving assembly includes a driving motor, a sliding rail is disposed on the base along a first direction, one end of the moving member is mounted on the sliding rail, and the driving motor is mounted on the moving member and drives the moving member to slide along the sliding rail.

In some embodiments, the lifting assembly comprises a lifting rod and a supporting seat, wherein the lifting rod is provided with a plurality of first adjusting holes, and the first adjusting holes are arranged at intervals along the length direction of the lifting rod;

the supporting seat is sleeved on the lifting rod, the supporting seat is provided with a plurality of second adjusting holes, at least one of the second adjusting holes corresponds to at least one of the first adjusting holes, and bolts penetrate through the first adjusting holes and the second adjusting holes which correspond to each other to fix the lifting rod with the supporting seat.

Drawings

Fig. 1 is a schematic view of an embodiment of the defoaming auxiliary apparatus of the present utility model.

Fig. 2 is an enlarged view at a in fig. 1.

Fig. 3 is a schematic view of another embodiment of the defoaming auxiliary apparatus of the present utility model.

Fig. 4 is a schematic view of another embodiment of the defoaming auxiliary apparatus of the present utility model.

Fig. 5 is a schematic view of another embodiment of the defoaming auxiliary apparatus of the present utility model.

Reference numerals:

100. a base; 101. a slide rail; 110. a moving member; 111. a body portion; 112. a contact portion; 120. a drive assembly; 121. a gear; 122. a rack; 123. a rotating shaft; 124. a bearing; 125. a locking member; 126. a mounting hole; 127. a first adjustment aperture; 128. a second adjustment aperture; 130. a lifting assembly; 131. a lifting rod; 132. a support base; 200. an overflow port; 201. glass liquid; 202. air bubbles; l1, a first direction; l2, second direction.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Photovoltaic glass is a special glass which is pressed into a solar cell through a layer, can generate electricity by utilizing solar radiation, and is provided with a relevant current lead-out device and a cable. The glass used for the photovoltaic power generation glass is not ordinary glass, but TCO conductive glass. Photovoltaic glass is a sheet glass produced by a calendaring method, and is one of the most important components of a solar cell module. The quality of the photovoltaic glass directly determines the product performance, service life and power generation efficiency of the photovoltaic module. The photovoltaic glass inevitably generates common defects in the production process such as: bubbles 202, open bubbles, stones, crystallization lines, etc.

Bubbles 202 are macroscopic gaseous inclusions in the glass that affect not only the quality of the appearance of the article, but more importantly the transparency and mechanical strength of the glass. Bubbles 202 may be generated due to chemical reactions occurring during the various stages of the melting process, as well as physically dissolved gases, including gases in the refractory interstices or gases carried into the glass during bubbling of the melt, and bubbles 202 caused by vapors of some volatile components. Thus, the elimination of bubbles 202 is an essential step in the production of glass sheets, which directly determines the quality of the subsequent glass sheets.

The defoaming auxiliary apparatus according to an aspect of the present utility model is for assisting in eliminating bubbles 202 in molten glass 201 in an overflow port 200, and includes a base 100, a moving member 110, a driving assembly 120, and a lifting assembly 130. The moving member 110 is mounted to the base 100, and the moving member 110 moves in the first direction L1 in a direction approaching the base 100 or in a direction separating from the base 100. One end of the moving member 110 protrudes into the molten glass 201 and contacts the bubble 202, pulling the bubble 202 to one side of the overflow port 200. The driving assembly 120 drives the moving member 110 to move along the first direction L1, the base 100 is mounted on the lifting assembly 130, and the lifting assembly 130 drives the base 100 to rise or fall. In particular, since photovoltaic glass is one of the most important components of a solar cell module, the quality of photovoltaic glass directly determines the product performance, lifetime and power generation efficiency of the photovoltaic module. In the production process of the photovoltaic glass, the quality of the photovoltaic glass is easily affected by the bubbles 202. In the photovoltaic glass production process, molten glass 201 flows out of the glass kiln through overflow 200 and is calendered by a calender to form a glass sheet. Since bubbles 202 exist in the molten glass 201, the bubbles 202 in the molten glass 201 need to be eliminated before the calendaring operation is performed on the molten glass 201 by the calendaring machine, so that the defect of bubble scars in the glass plate after calendaring is avoided. In the prior art, in order to eliminate the effect of bubbles 202 in the glass melt 201 on the formed glass sheet, one or more operators are required to hold the iron hooks by hand, stand beside the overflow port 200, extend the iron hooks into the glass melt 201, and, upon command of other operators, pull the bubbles 202 in the glass melt 201 in a direction substantially perpendicular to the flow of the glass melt 201, and pull the bubbles 202 to one side of the overflow port 200. Since the flow rate of the molten glass 201 at the side of the overflow port 200 is smaller than that of the molten glass 201 at the middle of the overflow port 200, the bubbles 202 pulled to the side of the overflow port 200 are eliminated while the molten glass 201 at the middle portion flows downward. However, because the temperature of the molten glass 201 is higher, generally above 1100 ℃, when an operator stands beside the overflow port 200 to perform construction, the physical consumption of the operator is extremely high, meanwhile, the construction precision of the operator is affected, the construction efficiency is low, the bubbles 202 are not completely eliminated, the subsequently formed glass plate is affected by bubble scars, and the quality of the glass plate is further affected.

In this embodiment, the mechanical structure is adopted to replace manual operation, so that on one hand, the working environment of operators is improved, the working efficiency is improved, and on the other hand, the accuracy of eliminating the bubbles 202 can be improved, and the quality of the glass plate is further ensured. The defoaming auxiliary apparatus of the present embodiment is provided with a moving member 110 for pulling the bubble 202, and the moving member 110 is movable in a first direction L1 (i.e., a direction perpendicular to the flow direction of the molten glass 201) so as to extend into the molten glass 201, pull the bubble 202 in the molten glass 201, and pull the bubble 202 to one side of the overflow port 200. In order to provide driving force to the moving member 110, instead of manual driving, the present embodiment further provides a driving assembly 120 for driving the moving member 110 to move the moving member 110 in the first direction L1, so that the moving member 110 pulls the bubble 202 to move to one side of the overflow port 200. In order to ensure stability of the defoaming auxiliary apparatus, in the present embodiment, the defoaming auxiliary apparatus is further provided with a base 100, and the moving member 110 and the driving assembly 120 are disposed at the base 100. In addition, in order to enable the defoaming auxiliary apparatus to adapt to overflow ports 200 with different heights, in the defoaming auxiliary apparatus of the present embodiment, a lifting assembly 130 is further provided, and the lifting assembly 130 is disposed below the base 100, supports the base 100, and can adjust the height of the base 100, so that the height of the moving member 110 is adjustable, and it is ensured that the moving member 110 can extend into the molten glass 201 to pull bubbles 202 in the molten glass 201.

The defoaming auxiliary device provided by the utility model has the following beneficial effects: the working strength of the operator can be reduced, and the elimination accuracy of the air bubbles 202 can be improved. Specifically, in the defoaming auxiliary apparatus according to the present embodiment, since the driving unit 120 is used to drive the moving member 110, on the one hand, the working strength of the operator can be reduced, and since the operator does not need to stand on both sides of the overflow port 200 and endure high temperature, the working environment of the operator can be improved. On the other hand, because the mechanical structure replaces the manual work, can improve defoaming precision, and then guarantee the quality of glass board.

Referring to fig. 1, in some embodiments, the drive assembly 120 includes a gear 121 and a rack 122, the rack 122 is fixedly mounted to the base 100, the gear 121 is engaged with the rack 122, and the gear 121 moves on the rack 122 in a first direction L1. Specifically, the driving assembly 120 may be a rack 122 structure of a gear 121, the gear 121 is engaged with the rack 122, the rack 122 is fixed, and the gear 121 may move along a length direction (i.e., the first direction L1) of the rack 122. The structure of the gear 121 and the rack 122 is adopted for transmission, the transmission precision is high, the service life of the structure of the gear 121 and the rack 122 is long, the work is stable and the reliability is high, and the constant transmission ratio can be ensured. Therefore, the gear 121 and the rack 122 are adopted to drive the moving member 110 stably, so that the pulling precision of the moving member 110 on the bubble 202 is ensured.

In some embodiments, the driving assembly 120 further includes a rotating shaft 123, one end of the rotating shaft 123 is disposed through the gear 121 by a bearing 124, one end of the rotating shaft 123 is provided with a locking member 125, a plurality of mounting holes 126 are provided on the locking member 125, and the moving member 110 is mounted in at least one of the plurality of mounting holes 126 and moves along the first direction L1 together with the gear 121 in a direction approaching the base 100 or a direction separating from the base 100; the other end of the rotation shaft 123 is provided with a hand-held portion. Specifically, referring to fig. 1, in the use process, an operator can push the gear 121 to rotate by holding the holding part (not shown), so that the moving member 110 moves together with the gear 121 in a direction approaching the base 100 or a direction separating from the base 100, which is convenient and labor-saving to operate, and prevents the operator from being too close to the overflow trough. Meanwhile, due to the adoption of the mechanical structure, the moving piece 110 is ensured to pull the bubble 202 more accurately, the bubble 202 is pulled to one side of the overflow groove, bubble scars on the glass plate are avoided, and the quality of the glass plate is improved. In addition, the moving member 110 is installed in at least one of the plurality of installation holes 126, so that the height of the moving member 110 can be adjusted to accommodate glass liquid 201 of different depths.

Referring to fig. 3, in some embodiments, the drive assembly 120 includes a gear 121 and a rack 122, the gear 121 being fixedly mounted to the base 100, the gear 121 being meshed with the rack 122. The base 100 is provided with a recess in which a portion of the rack 122 is received, the rack 122 moving in the first direction L1. Specifically, in addition to the above-described manner in which the rack 122 fixes the rotation of the gear 121, the gear 121 may be fixed, and the rack 122 may slide.

In some embodiments, the moving member 110 is fixedly mounted to the rack 122, and moves along the first direction L1 toward the base 100 or away from the base 100 together with the rack 122. The gear 121 is provided with a driving member, and the driving member drives the gear 121 to rotate. Specifically, when the gear 121 is fixed and the rack 122 slides, a driving member may be disposed on the gear 121, and the driving member drives the gear 121 to rotate so as to drive the rack 122 to slide and further drive the moving member 110 mounted on the rack 122 to move. In addition, a rocker may be provided on the gear 121, and the operator may shake the rocker by holding the rocker with his or her hand to rotate the gear 121. Can be specifically selected according to actual needs, and is not specifically limited herein.

In some embodiments, the moving member 110 is provided with a body portion 111 and a contact portion 112, the contact portion 112 being disposed perpendicular to the body portion 111. The contact part 112 is arranged at one end of the moving member 110 far away from the driving assembly 120, the contact part 112 stretches into the molten glass 201 to be in contact with the bubble 202, and pulls the bubble 202 to pull the bubble 202 to one side of the overflow port 200. Specifically, the body 111 and the contact 112 of the moving member 110 may be integrally formed or welded. The body 111 is perpendicular to the contact portion 112, the body 111 is suspended above the glass liquid 201, the contact portion 112 is arranged at one end of the body 111 far away from the driving assembly 120 and stretches into the glass liquid 201, bubbles 202 in the glass liquid 201 are pulled, the bubbles 202 are pulled to one side of the overflow groove, bubble scars are avoided, and the quality of the glass plate is improved.

In some embodiments, the moving member 110 is fixed by the locking member 125, and one end of the moving member 110 contacting the molten glass 201 is provided in a tapered shape. Specifically, in order to more precisely pull the bubble 202 in the molten glass 201, one end of the moving member 110 in contact with the molten glass 201 is provided in a tapered shape so that the bubble 202 is pulled to one side of the overflow port 200 by the moving member 110, assisting in the elimination of the bubble 202. In addition, as a material of the movable element 110, a material having a high melting point and strength such as iron or steel may be selected.

Referring to fig. 2, in some embodiments, a plurality of mounting holes 126 are provided on the locking member 125 at intervals along a second direction L2 perpendicular to the first direction L1, and one end of the moving member 110 is inserted into at least one of the plurality of mounting holes 126. Specifically, a plurality of mounting holes 126 are provided in the locking member 125, and one end of the moving member 110 is inserted into at least one of the plurality of mounting holes 126 and locked by the locking member 125. On the one hand, the height of the moving member 110 can be adjusted, for example, when the depth of the molten glass 201 in the overflow port 200 changes, the position of the moving member 110 inserted into the mounting hole 126 of the locking member 125 can be adjusted, so that the depth of the moving member 110 extending into the molten glass 201 is ensured, the air bubble 202 in the molten glass 201 is conveniently pulled, the operation precision is ensured, the elimination precision of the air bubble 202 is further ensured, and the quality of the glass plate is ensured.

In some embodiments, the driving assembly 120 includes a driving motor, a sliding rail 101 is disposed on the base 100 along the first direction L1, one end of the moving member 110 is mounted on the sliding rail 101, and the driving motor is mounted on the moving member 110 and drives the moving member 110 to slide along the sliding rail 101. Referring to fig. 4 and 5, as another embodiment of the present utility model, the driving assembly 120 may further include a driving motor. The sliding rail 101 is disposed on the base 100, and the sliding rail 101 and the base 100 are parallel to the overflow port 200 along the first direction L1 and disposed above the overflow port 200. One end of the moving member 110 is mounted on the sliding rail 101, and can move along the first direction L1 under the driving action of the driving motor, so as to pull the bubbles 202 in the molten glass 201.

In some embodiments, the lifting assembly 130 includes a lifting rod 131 and a supporting seat 132, the lifting rod 131 being provided with a plurality of first adjustment holes 127, the plurality of first adjustment holes 127 being spaced apart along a length direction of the lifting rod 131. The supporting seat 132 is sleeved on the lifting rod 131, the supporting seat 132 is provided with a plurality of second adjusting holes 128, at least one of the second adjusting holes 128 corresponds to at least one of the first adjusting holes 127, and bolts penetrate through the first adjusting holes 127 and the second adjusting holes 128 which correspond to each other to fix the lifting rod 131 and the supporting seat 132. Referring to fig. 1 to 5, in order to ensure that the defoaming auxiliary apparatus can be adapted to overflow ports 200 of different heights, in the present embodiment, a lifting assembly 130 is provided to adjust the height of the base 100 and the moving member 110 provided on the base 100, increasing the applicability of the defoaming auxiliary apparatus. Specifically, since the elevation assembly 130 includes the elevation rod 131 and the support block 132, the elevation rod 131 is provided with the plurality of first adjustment holes 127, and the support block 132 is provided with the plurality of second adjustment holes 128. In use, at least one first adjusting hole 127 and at least one second adjusting hole 128 at appropriate positions are selected to correspond to each other, and bolts penetrate through the first adjusting hole 127 and the second adjusting hole 128 corresponding to each other, so that the lifting rod 131 and the supporting seat 132 are fixed together, and the defoaming auxiliary device is adjusted to a proper height corresponding to the overflow port 200. One end of the moving member 110 is ensured to extend into the glass liquid 201, and bubbles 202 in the glass liquid 201 are pulled to assist in eliminating the bubbles 202, so that the problem of bubble scars is avoided, and the quality of a glass plate manufactured by using the glass liquid 201 later is ensured.

In addition, the supporting seat 132 is provided with a sleeve portion and a leg portion, the sleeve portion is hollow and sleeved on the lifting rod 131, and the plurality of second adjusting holes 128 are formed in the sleeve portion and correspond to the first adjusting holes 127 on the lifting rod 131 so as to adjust the height of the device. The setting of foot portion can make defoaming auxiliary device whole more stable, and when moving part 110 was driven, the stability of whole device can be guaranteed to the foot portion, avoids appearing the phenomenon that the head is heavy and the foot is light.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. Defoaming auxiliary device for supplementary bubble in the glass liquid of eliminating in the overflow mouth, its characterized in that includes:

a base;

the driving assembly drives the moving piece to move along the first direction;

and the base is installed on the lifting assembly.

2. The defoaming assistance apparatus of claim 1 wherein the drive assembly includes a gear and a rack fixedly mounted to the base, the gear engaged with the rack, the gear moving on the rack in the first direction.

3. The defoaming auxiliary apparatus according to claim 2, wherein the driving assembly further comprises a rotating shaft, one end of the rotating shaft is penetrated through the gear through a bearing, one end of the rotating shaft is provided with a locking member, the locking member is provided with a plurality of mounting holes, the moving member is mounted in at least one of the mounting holes, and moves together with the gear in the first direction in a direction approaching to the base or in a direction separating from the base;

the other end of the rotating shaft is provided with a handheld part.

4. The defoaming auxiliary apparatus according to claim 1, wherein the driving assembly comprises a gear and a rack, the gear being fixedly mounted to the base, the gear being in engagement with the rack;

5. The defoaming auxiliary apparatus according to claim 4, wherein the moving member is fixedly mounted to the rack and moves together with the rack in the first direction in a direction approaching the base or in a direction separating from the base;

6. The defoaming auxiliary apparatus according to any one of claims 2 to 5, wherein the moving element is provided with a body portion and a contact portion, the contact portion being disposed perpendicularly to the body portion;

7. The defoaming auxiliary apparatus according to claim 6, wherein the moving member is fixed by a locking member, and an end of the moving member contacting the molten glass is provided in a tapered shape.

8. The defoaming auxiliary apparatus according to claim 7, wherein a plurality of mounting holes are provided on the locking member at intervals along a second direction perpendicular to the first direction, and one end of the moving member is inserted into at least one of the plurality of mounting holes.

9. The defoaming auxiliary apparatus according to claim 1, wherein the driving assembly comprises a driving motor, a sliding rail is provided on the base along a first direction, one end of the moving member is mounted on the sliding rail, and the driving motor is mounted on the moving member and drives the moving member to slide along the sliding rail.

10. The defoaming auxiliary apparatus according to claim 1, 2, 3, 4, 5, 7, 8 or 9, wherein the lifting assembly comprises a lifting rod and a supporting seat, the lifting rod is provided with a plurality of first adjusting holes, and the plurality of first adjusting holes are arranged at intervals along the length direction of the lifting rod;